Live Gap Analysis β Nigerian Marine Biodiversity Reference Library v21
Tracking molecular barcode coverage for the Gulf of Guinea. Click any stat card or group below to filter the full species list. Taxa with absent status are undetectable in any eDNA survey β these are the highest priority for new voucher sequencing.
β
Data verified from live database queries β March 2026
NCBI Nucleotide: queried via Biopython Entrez (50 priority West African taxa β v1 query). Remaining 57 taxa: status based on published literature. BOLD Systems (v5): API currently unavailable β query pending. Geographic filter when run: Nigeria, Ghana, Cameroon, Benin, Togo, Senegal, Guinea, CΓ΄te d'Ivoire, Liberia. Run bold_query_fallback.py locally for full BOLD verification.
Coverage classification (v21, marker-specific): Present = WA records meet marker threshold (COI β₯5, 12S β₯3, 18S β₯1, 28S β₯1, rbcL β₯3) in both NCBI and BOLD/SILVA Β· Partial = WA records present but below threshold, or only one database covered Β· Absent = zero WA records in both databases.
Total taxa
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click to view all β
Sequences found
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click to view β
Priority gaps
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click to view β
Sequence coverage
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click for partial β
Nematode genera
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click to view β
Coverage by taxon group
Top priority gaps β fish & vertebrates (zero sequences globally)
Top priority gaps β nematodes (zero Nigeria/West Africa sequences)
Coastal fish context
The Niger Delta and Gulf of Guinea coastal zone supports one of Africa's largest small-scale fisheries, with estimated annual artisanal landings exceeding 700,000 tonnes (FAO, 2020). Key species include Ethmalosa fimbriata (bonga shad), which continues to account for approximately 41.8% of the artisanal catch by weight in the Lagos Lagoon (Oladipo et al., 2025).
Reference library gap β West Africa
A global review of eDNA metabarcoding studies found that Sub-Saharan Africa has the lowest regional representation in molecular reference databases of any tropical region (Manaf et al., 2025, Molecular Ecology Resources). False negatives in eDNA surveys are therefore disproportionately common in West African biodiversity assessments, rendering standard metabarcoding protocols unreliable without a region-specific library.
MiFish 12S β the global standard
The MiFish primer set (Miya et al., 2015, Royal Society Open Science) targets a ~170bp region of the mitochondrial 12S rRNA gene and can detect over 230 fish species simultaneously from a single 2L water sample. It is now the most widely adopted fish eDNA marker globally, with reference sequences available for over 7,000 species β but fewer than 50 from the Gulf of Guinea specifically.
Taxon
Common / role
Group
Marker
NCBI (global/WA)
BOLD / SILVA
IUCN
Priority
Ecological notes
Showing β taxa
Gulf of Guinea Marine Ecosystems
Nigeria's EEZ covers approximately 210,000 kmΒ² of the Gulf of Guinea, one of the most productive marine ecosystems in the Atlantic. The Gulf of Guinea is characterised by a seasonal upwelling system that drives exceptionally high primary productivity, supporting both coastal small-scale fisheries and offshore industrial trawl and purse-seine operations (Cury & Roy, 1989, Canadian Journal of Fisheries and Aquatic Sciences). This tab covers truly marine species: offshore fish, reef taxa, marine invertebrates, seagrass, macroalgae, and offshore mammals. Primary markers: 12S rRNA (MiFish-U/E) for fish; COI (Leray-XT) for invertebrates and mammals; rbcL for plants and algae.
Gulf of Guinea endemics
Pteroscion peli, Lutjanus goreensis, and Scomberomorus tritor are among several species whose entire global range lies within or near the Gulf of Guinea. None have been barcoded from Nigerian waters. First-barcode records from this region would represent genuinely novel contributions to global sequence databases (Hebert et al., 2003, Proc. Royal Soc. B).
Sargassum inundations
Since 2011, massive Sargassum inundations have struck Nigerian coastal waters annually, impacting fisheries and coastal tourism (Wang et al., 2019, Science). eDNA-based monitoring using rbcL reference sequences enables source tracking and early warning detection before physical landfall.
Species
Common name
Group
Marker
NCBI
BOLD / SILVA
Priority
Notes
Showing β species Β·
Gulf of Guinea endemic species highlighted in blue
Since 2011, massive Sargassum inundations have increasingly impacted Nigerian coastal waters, smothering nearshore fish nurseries and fouling fishing gear. Two species β S. natans and S. fluitans β dominate these blooms. Having rbcL reference sequences from the Gulf of Guinea allows eDNA-based early detection and source tracking of bloom events, directly relevant to NMBL's monitoring mandate.
Gulf of Guinea endemics β highest scientific value
Several species in this list are endemic or near-endemic to the Gulf of Guinea β found nowhere else in the world. Pteroscion peli (boe drum), Lutjanus goreensis (Gorean snapper), and Scomberomorus tritor (West African Spanish mackerel) are examples with zero or near-zero sequences. These are the highest-priority targets because their barcodes do not exist anywhere β not just in Nigeria.
All Fish species β This tab consolidates all fish taxa from both estuarine/coastal and offshore marine environments. Primary marker: 12S rRNA (MiFish-U/E). Includes species from Lagos Lagoon, Niger Delta, nearshore and offshore Gulf of Guinea.
Species
Common name
Group
Marker
NCBI
BOLD
IUCN
Priority
Notes
Showing β fish species
Niger Delta / Lagos Lagoon context: Macrobenthos (animals >1mm) are the dominant component of estuarine and intertidal food webs. Tympanotonos fuscatus is the most abundant macrobenthic invertebrate in Niger Delta mangroves and a proven oil pollution indicator β populations collapse near spill sites. Primary marker for all groups: COI (Leray-XT primers). Secondary: 16S rRNA.
Species
Common name
Group
Habitat
Marker
NCBI COI
BOLD
Priority
Ecological role / notes
Showing β species Β·
Tympanotonos and Pachymelania are highlighted β your named priority species
Tympanotonos fuscatus β why it matters
Most abundant macroinvertebrate in Niger Delta mangroves
Major protein source β sold in every coastal market
Population density drops >90% near oil spill sites
Used as biomonitor in Niger Delta pollution studies
Very few COI sequences from Nigeria in any database
Macrobenthos sampling methods
Intertidal: 0.25mΒ² quadrat, hand-pick all visible fauna Subtidal: Van Veen grab (0.1mΒ²), sieve through 1mm mesh Mangrove: Timed search + area quadrat on prop roots DNA: Foot/mantle tissue clip in 95% ethanol Marker: COI with Leray-XT or universal primers
Niger Delta focus: Free-living nematodes are the most abundant multicellular animals in coastal sediment and the primary bioindicator of oil pollution. The nematode-to-copepod (N:C) ratio rises under organic enrichment and hydrocarbon contamination. Genera marked tolerant increase at polluted sites; sensitive genera decrease. Primary marker: 18S rRNA V1V2 (NF1/18Sr2b primers). Secondary: 28S D2D3 for species resolution.
Genus
Order
Pollution response
Global 18S
W.Africa 18S
Nigeria 18S
Global 28S
Nigeria gap
Ecological role
Showing β genera Β·
0 red in Nigeria = priority gap Β·
0 amber in Global = globally unsequenced Β·
Row background: red = Nigeria gap
amber = globally unsequenced
SILVA SSU β most complete 18S nematode db WoRMS β accepted taxonomy NeMys β nematode species register BOLD β barcode sequences
About the Library
The Nigerian Marine Biodiversity Reference Library is a systematic initiative to build the first comprehensive, voucher-linked molecular barcode database for the coastal and marine species of the Gulf of Guinea, directly addressing a critical gap in global eDNA metabarcoding infrastructure.
Nigeria's EEZ covers ~210,000 kmΒ² of the Gulf of Guinea, one of the most productive marine ecosystems in the Atlantic, supporting millions of livelihoods through artisanal and industrial fisheries, mangrove ecosystem services, and offshore energy operations. The Niger Delta holds the largest mangrove forest in Africa β over 1 million hectares, and the third largest in the world. This library is the molecular foundation that makes evidence-based management of that ecosystem possible.
Project Mission: A major limitation of environmental DNA (eDNA) metabarcoding in West Africa is the lack of regionally representative reference sequences for coastal and lagoon biodiversity. This project contributes to the development of a preliminary molecular reference library for Nigerian coastal ecosystems by generating validated sequences from dominant lagoon taxa, including fish, macrobenthos, and meiofauna. Establishing this reference framework will improve taxonomic assignment accuracy for future eDNA surveys in the Gulf of Guinea and support long-term biodiversity monitoring, conservation planning, and blue economy initiatives in Nigeria. The resulting reference sequences will be deposited in global databases such as NCBI and BOLD Systems to improve global coverage of West African marine biodiversity.
Support This Research
π Donate to EnviroBiotics Research
Your contribution directly funds field collection expeditions, sequencing reagents and laboratory consumables for building Nigeria's first open molecular reference library. Every donation β no matter the size β helps close the West African biodiversity gap in global eDNA databases.
π€ Field collection day (boat hire): ~$150
π§ͺ DNA extraction kit (50 samples): ~$200
π¦ Ethanol + tubes (100 samples): ~$40
π₯οΈ Server hosting per year: ~$150
About the Library
Environmental DNA (eDNA) metabarcoding has transformed biodiversity monitoring worldwide. By filtering water or sediment, extracting trace DNA shed by organisms, and matching sequences against reference databases, researchers can detect hundreds of species simultaneously, without nets, traps, or direct observation. The approach is particularly powerful in tropical coastal systems where traditional survey methods are logistically challenging and where biodiversity is highest.
However, the effectiveness of eDNA metabarcoding is fundamentally limited by the completeness of reference sequence libraries. When an organism's DNA is detected in a sample, it can only be identified if a matching reference barcode exists in the database. If no reference exists, the organism produces a false negative: present in the water, present in the data, but invisible to science.
A systematic review of global eDNA literature (Manaf et al., 2025) confirmed that Sub-Saharan Africa, including Nigeria and the Gulf of Guinea, is critically under-represented in global reference databases. The West African coast, one of the most productive and commercially important marine ecosystems in the Atlantic, is essentially absent from the molecular record. This library exists to change that.
Nigeria's EEZ in numbers
Approximately 210,000 kmΒ² of exclusive economic zone in the Gulf of Guinea. Over 900 km of coastline spanning Lagos, the Niger Delta, and the Cross River estuary. Home to one of the largest mangrove forests in Africa, patch coral reefs, and highly productive offshore upwelling zones supporting major pelagic fisheries.
Gulf of Guinea endemics β highest scientific value
Several target species are endemic or near-endemic to the Gulf of Guinea β found nowhere else on Earth. Pteroscion peli (boe drum), Lutjanus goreensis (Gorean snapper), and Scomberomorus tritor (West African Spanish mackerel) have zero or near-zero sequences in global databases. These are the highest-priority targets because their barcodes do not exist anywhere β not just in Nigeria. Generating even one well-vouched barcode from each is a genuine global contribution.
Sargassum β an emerging monitoring priority
Since 2011, massive Sargassum inundations have increasingly impacted Nigerian coastal waters, smothering nearshore fish nurseries and fouling fishing gear. Two species β S. natans and S. fluitans β dominate these blooms. Having rbcL reference sequences from the Gulf of Guinea enables eDNA-based early detection and source tracking of bloom events β directly relevant to NMBL's coastal monitoring mandate.
The Reference Gap Problem
A BOLD Systems search for Nematoda returns 132,070 specimen records globally. Only 79,150 have qualifying barcodes. Of these, West African records number in the dozens, and Nigerian coastal records are essentially zero. Every missing sequence is a species that eDNA metabarcoding cannot detect in Nigerian waters, regardless of the quality of fieldwork or laboratory methods.
Why This Library Matters
Nigeria's EEZ covers approximately 210,000 kmΒ² of the Gulf of Guinea, supporting millions of livelihoods through artisanal and industrial fisheries, mangrove ecosystem services, and offshore energy operations. Effective environmental monitoring, biodiversity assessment, and compliance with the Kunming-Montreal Global Biodiversity Framework all require a functional molecular reference library. None currently exists for this region.
All sequences in this library are generated from physical voucher specimens that are photographed and morphologically identified at the time of collection. For each specimen, GPS coordinates, collection date, habitat type, and collector name are recorded and stored alongside the sequence data. This metadata-linked approach is what distinguishes a reference library from a simple sequence database: it allows identifications to be verified, errors to be traced back to source, and sequences to be properly cited in publications.
Note: This library is currently in development. Physical specimens are being collected and sequenced as part of ongoing fieldwork at NMBL. Sequences will be deposited in BOLD Systems (project NGMBL) and NCBI GenBank as they are generated and quality-checked. No sequences have been formally deposited at this stage.
The Niger Delta is one of the most heavily oiled ecosystems on Earth, with decades of pipeline spills, well-blowouts, and chronic hydrocarbon seepage. Free-living nematodes are the most sensitive and abundant metazoan bioindicators of this contamination. The nematode-to-copepod (N:C) ratio rises sharply under organic enrichment and oil pollution β from a baseline below 50 in clean sediments, to values exceeding 1,000 at severely contaminated sites. For free-living nematodes, identification to genus level requires compound microscopy at 400β1000Γ magnification. Sediment cores are split: one half fixed in 4% formalin for morphological identification, one half frozen at β20Β°C for DNA extraction. Single specimens are photographed before individual DNA extraction and PCR amplification. This paired morphological-molecular approach produces the highest-quality nematode reference records.
Systematic quantification of missing sequences for coastal and marine Nigerian taxa across NCBI, BOLD, and SILVA. This dashboard represents the current output.
Phase 1 β Fish Market Vouchers
Tissue collection from Lagos fish markets (Mile 12, Oyingbo, Badore) targeting high-priority estuarine and coastal fish gaps. PCR with MiFish-U primers, Sanger sequencing, BOLD deposit.
Phase 2 β Niger Delta Sediment Survey
Sediment core collection across a pollution gradient (clean reference β moderately impacted β heavily impacted oil spill sites). Nematode morphology + 18S/28S barcoding. N:C ratio pollution analysis.
Phase 3 β Macrobenthos and Marine Invertebrates
Tympanotonos fuscatus, Pachymelania spp., mangrove crabs, bivalves. COI barcoding. Intertidal and subtidal quadrat surveys.
Phase 4 β Offshore Marine Species
NMBL research vessel trawl survey barcoding. Offshore demersal fish, Gulf of Guinea endemics, coral reef taxa.
Phase 5 β Public Library Launch
NMBL website launches. Sequences publicly available via BOLD project NGMBL. Data paper submitted to Biodiversity Data Journal (Pensoft) or Scientific Data (Nature Portfolio).
The Database
A live gap analysis dashboard tracking the molecular barcode coverage of Nigerian coastal and marine biodiversity across all major taxonomic groups. Updated as new sequences are generated and deposited.
NEW IN v21Methodology update β marker-specific WA thresholdsReleased April 2026
β Classification rule rewritten
The v20 "WA β₯50% of global NCBI" ratio is retired. Classification now uses marker-specific absolute WA record thresholds β COI β₯5, 12S β₯3, 18S β₯1, 28S β₯1, rbcL β₯3 β chosen to reflect the intraspecific variation needed for reliable identification with each marker.
β Scope change β WA-absent now means absent
A species with global records but zero West African records is now classified NCBI-absent for the regional reference library. Global coverage no longer rescues regional gaps. This affects Tursiops truncatus, Chelonia mydas, Dermochelys coriacea, Lepidochelys olivacea, Carcharhinus leucas, Rhizoprionodon acutus, Parapenaeus longirostris, and others.
Ξ Reclassification summary
Three overall-status changes under the new rule: Sardinella maderensis present β partial; Rhizoprionodon acutus and Penaeus notialis partial β absent. Several NCBI-level statuses corrected upward (P. elongatus, Sphyrna lewini) or downward (all turtles, cetaceans, and deep-water shrimps with zero WA records).
β‘ UI updates
Decision-tree flowchart redrawn with a three-stage logic (any WA? β meets threshold? β both databases?) and a marker-threshold legend. All PRESENT/PARTIAL/ABSENT definition cards, Statistics page copy, coverage legend, and species-level notes updated to match. Stale v18/v20 references corrected.
π¬ Scientific rationale
The 50% ratio was mathematically unstable for data-rich species (a fish with 80/400 WA records failed despite operational sufficiency, while a species with 2/2 passed). Absolute marker-specific thresholds align classification with the real question: "can we reliably identify a Nigerian specimen from existing reference data?" Global counts are retained as context but no longer classify.
π‘ Audit trail
Species entries previously flagged as "present" with ratio-inflated status (e.g. Sardinella maderensis at 2/2 = 100%) have been reviewed and corrected. Critical gaps, well-covered, and partial coverage lists reconciled. Priority flags adjusted where overall status changed.
v20 HISTORYWhat shipped in v20Released April 2026
β Headline feature
Top Priority Sequencing Targets leaderboard on the Statistics page β ranked list weighted by absence, IUCN status, and ecological priority. The funder-ready answer to "what should we sequence next?"
+ New view
IUCN Γ coverage crosstab on the Statistics page β surfaces threatened taxa (VU/EN/CR) that lack reference barcodes.
+ New view
Coverage classification flowchart below β visual decision tree for the present / partial / absent assignment (updated in v21 to reflect marker-specific WA thresholds).
β‘ UX improvement
Keyboard shortcuts β press βK / Ctrl+K or / to focus search, Esc to dismiss.
π Bug fixes
Removed duplicate Cloudflare email script (loaded 3Γ before); fixed broken [email protected] placeholders on Gallery and Bank Transfer; consolidated duplicate back-to-top buttons; repaired truncated newsletter handler.
π Responsive
Statistics KPI grids now use auto-fit layout β no longer cramped on tablets and phones.
Why coverage matters
Every species in the "absent" column could represent a false negative in any eDNA metabarcoding study conducted in Nigerian waters. The animal or plant may be present, its DNA may be in your sample, and your PCR may amplify it perfectly β but without a matching reference barcode, your analysis software returns nothing. This dashboard makes the scale of that problem visible and actionable.
Gulf of Guinea endemics β priority targets
Pteroscion peli (boe drum), Lutjanus goreensis (Gorean snapper), Scomberomorus tritor (West African Spanish mackerel), and Strombus latus (West African stromb) are among several species with zero sequences anywhere in global databases. Each represents a publishable first-barcode contribution. Tympanotonos fuscatus β the most commercially important macroinvertebrate in the Niger Delta β has partial global coverage but zero Nigeria-specific records.
Nematodes β 25 genera across 8 orders, 18S + 28S
Meiofauna β copepods, ostracods, foraminifera
Seagrass & macroalgae β including Sargassum bloom species
Marine mammals β including African manatee, Atlantic humpback dolphin
Sea turtles β all three nesting species
How to use this database
The Gap Analysis tab gives an overview of sequence coverage across all taxonomic groups. Click any stat card or group card to filter the full taxa list.
The All Taxa tab shows every species in one searchable, sortable table with filters by group, marker, status, and priority. Use the search bar at the top of the page to find any species instantly.
The dedicated Marine Species, Macrobenthos, and Nematodes tabs each provide deeper views of their groups with group-specific filters and ecological context.
All data can be exported as CSV from each tab for use in your own analysis or grant proposal.
Cite this database
Odedere, A.O. (2026). Nigerian Marine Biodiversity Reference Library: A molecular reference framework for the coastal and marine biodiversity of the Gulf of Guinea. Available at: EnviroBiotics.org [accessed 30 March 2026]. doi:10.5281/zenodo.19201628
Applied to every species at render time β no manual classification
COI β₯5 WA records Fast-evolving animal barcode
12S β₯3 WA records Vertebrate eDNA marker
18S β₯1 WA record Genus-level, conserved
28S β₯1 WA record Genus-level metazoan
rbcL β₯3 WA records Plants/algae barcode
Worked examples.Sardinella aurita has 4 WA 12S records (β₯3, meets threshold) and BOLD WA records confirmed β overall present. Drepane africana has 2 WA 12S records (below the threshold of 3) β partial, more regional barcodes needed. Tursiops truncatus has 42 global COI records but zero West African records β NCBI is absent for the regional library regardless of global abundance; BOLD WA-present keeps overall status partial. This is the key shift from v20: global coverage no longer rescues a species with zero regional sequences.
β PRESENTQualifying barcodes in both NCBI and BOLD/SILVA, with WA records meeting the marker threshold (COI β₯5, 12S β₯3, 18S β₯1, 28S β₯1, rbcL β₯3). Reliably detectable for Nigerian eDNA β though Nigeria-specific sequences remain preferred.
~ PARTIALWA records exist but fall below the marker threshold, or sequences exist in only one database. Identification possible but not robust β more regional barcodes needed.
β ABSENTZero West African records in both NCBI and BOLD/SILVA. No regional reference sequence exists for this taxon β undetectable in Nigerian eDNA surveys regardless of global availability. Highest priority for new voucher collection and barcoding.
Coverage status is derived by cross-referencing each taxon against the following 10 global databases. A taxon is classified present when qualifying barcodes exist in both NCBI and BOLD/SILVA with West African records meeting the marker-specific threshold (COI β₯5, 12S β₯3, 18S β₯1, 28S β₯1, rbcL β₯3); partial when WA records exist but fall below the marker threshold, or when only one database is covered; and absent when zero WA records exist in both NCBI and BOLD/SILVA. Thresholds reflect the intraspecific variation needed for reliable identification with each marker β fast-evolving barcodes like COI require more replicate sequences to capture haplotype diversity, while conserved ribosomal markers (18S, 28S) used for genus-level work are operationally useful with a single well-curated reference. Classification is WA-specific: a taxon with global records but zero West African sequences is an "absent" gap in the regional reference library, regardless of global coverage.
Most comprehensive 18S rRNA database. Used for nematodes, meiofauna, protists.
WoRMS / FishBase
Taxonomy authority & accepted names. IUCN status and regional checklists.
NeMys / OBIS / GBIF
Nematode taxonomy (NeMys); occurrence records (OBIS/GBIF) for Gulf of Guinea.
AlgaeBase / ENA
Macroalgae & seagrass taxonomy; supplementary sequences via ENA/EMBL.
IUCN Red List
Conservation status for all vertebrates, elasmobranchs, sea turtles, and marine mammals.
Key Insights & Scientific Findings
π΄ Critical Gaps β Zero West African Reference Records
All 25 nematode genera tracked β 0 Nigeria sequences for all (18S and 28S)
Cynoglossus senegalensis (Senegalese tonguesole) β zero records, abundant bycatch
Gulf of Guinea endemics (Pteroscion peli, Lutjanus goreensis, Lutjanus agennes) β zero records globally
Tursiops truncatus, Carcharhinus leucas β well-barcoded globally (42 and 7 records) but zero West African sequences; undetectable in Nigerian eDNA without regional vouchers
Sea turtles (Chelonia mydas, Dermochelys coriacea, Lepidochelys olivacea) β nest on Nigerian beaches, zero WA 12S records
Penaeus notialis (pink shrimp, largest commercial fishery) β 45 global COI but zero WA; major regional gap
Sesarma huzardi, Goniopsis pelii, Egeria radiata β staple seafood, zero records
Strombus latus (West African stromb, endemic) β zero records
Callinectes amnicola (Lagos lagoon swimming crab) β 1 WA COI record; below threshold of 5
Macrobrachium vollenhovenii (African river prawn) β 1 WA COI record; below threshold
Tympanotonos fuscatus (Niger Delta periwinkle) β NCBI partial; zero Nigeria-specific
π Data Interpretation & Integrity Notes
Classification is regional: "present" means West African records meet the marker threshold β not global availability
Zero WA = absent, regardless of how well-studied the species is globally (major shift from v20)
Nematode 0 values are real β NCBI, BOLD, and SILVA all return zero Nigeria/WA records
SILVA is more complete than NCBI for 18S nematode sequences
IUCN statuses sourced from IUCN Red List (2024); subject to revision
Dashboard v21 β run Python scripts locally to update with live database counts
Marker gene guide
12S rRNA Fish and vertebrates
The MiFish universal primer set (MiFish-U/E) amplifies a ~170bp region of the 12S ribosomal RNA gene. It is the global standard for fish eDNA metabarcoding β highly sensitive, works from both water-column eDNA and tissue extracts, and directly comparable to thousands of published datasets.
COI Animals and invertebrates
Cytochrome oxidase I is the universal animal barcode β the primary marker of the BOLD Systems database. The Leray-XT primers amplify a ~313bp region suitable for metabarcoding. Used here for macrobenthos (gastropods, bivalves, polychaetes, crabs), marine invertebrates, and marine mammals.
18S rRNA Meiofauna and protists
The V1V2 hypervariable region of the 18S small subunit ribosomal RNA gene is the primary marker for meiofauna metabarcoding. Primers NF1 / 18Sr2b amplify across free-living nematodes, copepods, and protists. Sequences are classified against the SILVA SSU reference database.
Emerging priorities
Sargassum bloom monitoring
Since 2011, catastrophic Sargassum inundations have struck Nigerian coastal waters annually. Two species dominate: Sargassum natans and S. fluitans. Having rbcL reference sequences from Gulf of Guinea populations enables eDNA-based early warning detection β tracking bloom approach before physical landfall β and source attribution studies to understand whether bloom material originates from the open Atlantic or local coastal populations. This is an active monitoring need for NMBL.
Niger Delta sediment eDNA
Sediment eDNA from the Niger Delta captures the meiofaunal community β principally free-living nematodes β whose composition changes measurably and predictably under hydrocarbon contamination. The nematode-to-copepod (N:C) ratio is a well-validated pollution index. With a West African nematode reference library, these indices can be computed from eDNA data rather than requiring time-consuming microscopy β transforming Niger Delta pollution monitoring for regulators, oil companies, and community stakeholders alike.
Offshore EEZ biodiversity
Nigeria's ~210,000 kmΒ² EEZ remains almost entirely uncharacterised at the molecular level. Gulf of Guinea endemic fish species β demersal groupers, snappers, croakers unique to this ecosystem β have never been barcoded. As Nigeria expands its Blue Economy policy framework and deepwater oil operations, baseline molecular biodiversity data for the EEZ becomes essential for impact assessment, fisheries management, and international reporting under the Kunming-Montreal Global Biodiversity Framework.
Data deposition and access
Public repositories
All sequences generated by this project are deposited in: BOLD Systems (project NGMBL β Nigerian Marine Biodiversity Reference Library), NCBI GenBank with full voucher metadata, and SILVA (for 18S sequences). All deposits are open access with no embargo.
Contact & Collaboration
Enquiries are welcomed from researchers, institutions, students, and organisations interested in West African marine biodiversity, eDNA methodology, environmental monitoring, or molecular reference library development.
Nigeria's EEZ β 210,000 kmΒ² uncharacterised
The Gulf of Guinea is one of the Atlantic's most productive ecosystems, yet its biodiversity is almost entirely absent from global molecular databases. EnviroBiotics is uniquely positioned to lead the first systematic barcoding effort for this region. Collaborations that bring sequencing infrastructure, taxonomic expertise, or field capacity are especially welcome.
Funding and grant collaboration
This library is an eligible foundation for proposals to TETFUND (TETFund National Research Fund), the Belmont Forum, GCRF successor programmes, the EU-Africa Blue Economy Research Initiative, and bilateral programmes between Nigerian institutions and European, American, or Asian universities. If you are developing a proposal where West African marine molecular data is a component, please get in touch.
EnviroBiotics offers wet laboratory facilities, vessel access, and an extensive existing specimen collection. Collaborative training workshops in eDNA field methods, DNA extraction, PCR optimisation, and bioinformatics (QIIME2, DADA2, BLAST) are available for partner institutions across West Africa. If you are building eDNA capacity at a West African university, this library is designed to support your work.
Research collaboration interests
Open to collaboration on
Joint field surveys β Niger Delta, Lagos Lagoon, Gulf of Guinea offshore
eDNA metabarcoding studies in West African coastal waters
Nematode taxonomy and meiofauna ecology in tropical systems
Environmental and oil spill impact assessment using biological indicators
Molecular reference library development for underrepresented tropical taxa
Co-supervision of MSc and PhD students in molecular marine ecology
Capacity building workshops in eDNA methods for West African researchers
Database Curator
Adelodun Odedere
Department of Biological Oceanography
Nigerian Institute for Oceanography and Marine Research (NMBL)
3 Wilmot Point Road, Bar Beach, Victoria Island
Lagos, Nigeria
How to cite the Nigerian Marine Biodiversity Reference Library, its data sources, and individual records. Researchers using data from this library in publications should acknowledge the database as described below.
Citing this database
Odedere Adelodun. (2026). Nigerian Marine Biodiversity Reference Library: A molecular reference framework for the coastal and marine biodiversity of the Gulf of Guinea. Available at: EnviroBiotics.org [accessed 30 March 2026]. DOI: 10.5281/zenodo.19201628
If data from this library constitutes a substantial proportion of records used in an analysis, please contact the curator directly before publication. There may be additional unpublished data of value to your study.
Citing partner databases used in this library
BOLD Systems
Ratnasingham, S. & Hebert, P.D.N. (2007). BOLD: The Barcode of Life Data System [www.barcodinglife.org]. Molecular Ecology Notes, 7(3), 355β364. doi:10.1111/j.1471-8286.2007.01678.x ↗
Quast, C. et al. (2013). The SILVA ribosomal RNA gene database project: improved data processing and web-based tools. Nucleic Acids Research, 41(D1), D590βD596. doi:10.1093/nar/gks1219 ↗
Froese, R. & Pauly, D. (Eds.) (2024). FishBase. World Wide Web electronic publication. fishbase.org, version (06/2024).
OBIS
OBIS (2024). Ocean Biodiversity Information System. Intergovernmental Oceanographic Commission of UNESCO. obis.org, accessed [date].
NeMys β World Database of Nematodes
Nemys eds. (2026). Nemys: World Database of Nematodes. Accessed at nemys.ugent.be. doi:10.14284/366 Nematode taxonomy and nomenclature in this library follows NeMys. If NeMys data constitutes a substantial proportion of records used in analyses, the chief editors should be contacted. Cite individual datasource references for specific records.
MiFish primers (12S)
Miya, M. et al. (2015). MiFish, a set of universal PCR primers for metabarcoding environmental DNA from fishes. Royal Society Open Science, 2(7), 150088. doi:10.1098/rsos.150088 ↗
COI Leray-XT primers
Leray, M. et al. (2013). A new versatile primer set targeting a short fragment of the mitochondrial COI region for metabarcoding. Frontiers in Zoology, 10, 34. doi:10.1186/1742-9994-10-34 ↗
Deiner, K. et al. (2017). Environmental DNA metabarcoding: Transforming how we survey animal and plant communities. Molecular Ecology, 26(21), 5872β5895. doi:10.1111/mec.14350 ↗
Publications citing this library
This library is currently in development. When sequences are deposited in BOLD and NCBI, publications citing the library will be listed here by year in reverse chronological order.
If you have used data from this library in a publication, please contact the curator so your citation can be added here.
Statistics
Live database coverage statistics for the Nigerian Marine Biodiversity Reference Library. Coverage is computed dynamically from the data arrays β all stats update automatically when classifications change. Present requires West African records meeting the marker threshold (COI β₯5, 12S β₯3, 18S β₯1, 28S β₯1, rbcL β₯3) in both NCBI and BOLD/SILVA. Absent = zero WA records in both databases. Coverage reflects regional (West African) reference availability, not global sequence count.
Overall Global Coverage
Priority Gaps (Absent taxa) by Taxonomic Group
β Top Priority Sequencing TargetsNEW v20
A weighted ranking of taxa most in need of new voucher sequencing. Score = base priority (high=3, med=2, low=1) + absent overall (+3) + IUCN threatened (CR=4, EN=3, VU=2, NT=1) + zero global records (+2) + Nigerian commercial/ecological priority (+1). The top entries are the strongest candidates for grant proposals or first-barcode publications.
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Species
Group
Marker
Status
IUCN
Score
Why prioritise
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Showing top 15 β use the dropdowns to refine. Highest score = highest priority.
IUCN Status Γ Reference CoverageNEW v20
The conservation-urgency view: IUCN-listed threatened species (Vulnerable, Endangered, Critically Endangered) cross-tabulated against reference coverage. Threatened taxa with absent or partial coverage cannot be reliably monitored by eDNA β a gap with direct consequences for fisheries policy, MPA management, and CITES reporting.
Database records
Taxonomic group
Taxa tracked
Present (global)
Partial (WA gap)
Absent (0 WA)
Global coverage %
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Column definitions:Taxa tracked β all species/genera assessed in this dashboard.
Present (regional) β taxa with qualifying barcodes in BOTH NCBI AND BOLD/SILVA, with WA records meeting the marker threshold (COI β₯5, 12S β₯3, 18S β₯1, 28S β₯1, rbcL β₯3).
Partial (regional gap) β WA records exist but fall below marker threshold, or only one database covered.
Absent (WA gap) β zero West African records in both NCBI and BOLD/SILVA; highest priority for new barcoding regardless of global availability.
Regional coverage % β percentage of taxa with at least one qualifying WA barcode record across both databases.
Marker gene coverage
Marker gene
Target groups
Primers used
Primary database
Taxa tracked
With barcode
Gaps
Coverage
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Web statistics
Web analytics will be recorded once the NMBL site goes live. The table below will be populated monthly.
Month
Unique visitors
Number of visits
Pages viewed
Hits
April 2026
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Web statistics include webservice usage and undetectable AI bots. Unique visitor counts use cookie-based identification where permitted.
Media Gallery & Identification Keys
Photographs, microscopy images, and identification guides for the coastal and marine species of the Gulf of Guinea. Voucher photographs are linked to sequence records in the database. Identification keys will be added as the library grows.
Coming soon β placeholder categories
Voucher photographs
High-resolution photographs of voucher specimens, linked to sequence records. Fish, macrobenthos, and marine invertebrates.
0 images β awaiting first field collection
Microscopy β nematodes
Compound microscopy images (400β1000Γ) of free-living nematode genera from Niger Delta and Lagos Lagoon sediments. Diagnostic features labelled.
0 images β awaiting sediment survey
Identification keys
Illustrated dichotomous keys for common Gulf of Guinea coastal fish, macrobenthic gastropods, and nematode genera.
In preparation
Field & lab photographs
Lagos fish market
Sediment coring
Niger Delta mangrove
NMBL laboratory
📷 How to Add Species Images
Species images appear in the search popup when you click a species in search results. To add an image: (1) host your photo at a public URL (Google Drive with public link sharing, Imgur, or your own web server); (2) locate the species entry in the JavaScript data arrays and add an image: "https://...url..." field; (3) the popup will automatically render it. Until an image is provided, a placeholder message is shown.
Recommended naming: Photograph each voucher specimen before tissue collection → upload to shared Google Drive → share publicly → paste the URL into the species data. Name files as: genus_species_NMBL-ID.jpg
A curated directory of databases, government institutions, policy frameworks, tools, and educational materials for marine biodiversity research, eDNA metabarcoding, and blue economy management in Nigeria and the Gulf of Guinea.
Understanding Biological Classification
How Taxonomic Classification Works β The Hierarchy of Life
Think of classification as a funnel moving from the broadest category to the most specific identifier. Every species has a unique two-part Latin name (genus + species) β a system invented by Carl Linnaeus in 1758 that scientists worldwide use today.
The 8 Levels β from broadest to most specific
Domain β EukaryaBroadest
Kingdom β Animalia
Phylum β Chordata
Class β Mammalia
Order β Primates
Family β Hominidae
Genus β Homo
Species β sapiensMost specific
π‘ Mnemonic:Dear King Philip Came Over For Good Soup
Example β Bonga Shad (key species in this library)
DomainEukarya
KingdomAnimalia
PhylumChordata
ClassActinopterygii
OrderClupeiformes
FamilyClupeidae
GenusEthmalosa
Speciesfimbriata
Full name: Ethmalosa fimbriata (Bowdich, 1825). The italicised two-part name (binomial nomenclature) is internationally standardised and used identically whether you are in Lagos, London, or Tokyo.
πΏ
The Niger Delta β Africa's Largest Mangrove Forest
The Niger Delta holds the largest mangrove forest in Africa β covering over 1 million hectares β and is the third largest mangrove ecosystem in the world. These forests are critical nursery grounds for fish, habitat for the endangered African manatee (Trichechus senegalensis), and the primary livelihood for millions of coastal Nigerians. Despite their ecological importance, the biodiversity of these mangroves remains almost entirely uncharacterised at the molecular level.
BBNJ Agreement β Ocean Biodiversity Beyond National Jurisdiction
The High Seas Treaty (BBNJ, 2023)
In March 2023, UN member states adopted the historic Agreement on the Conservation and Sustainable Use of Marine Biological Diversity of Areas Beyond National Jurisdiction (BBNJ) β also known as the High Seas Treaty. This legally binding instrument covers the high seas, which constitute approximately 64% of the ocean surface and 95% of its volume, yet were previously largely unprotected. The BBNJ agreement establishes: (1) a framework for establishing marine protected areas on the high seas; (2) requirements for environmental impact assessments for high seas activities; (3) mechanisms for sharing benefits from the use of marine genetic resources; and (4) technology transfer and capacity-building provisions specifically aimed at developing nations, including West African coastal states.
For Nigeria and the Gulf of Guinea region, the BBNJ agreement is particularly significant because: the Exclusive Economic Zones of Gulf of Guinea states border areas that will fall under BBNJ governance; the marine genetic resources provisions create legal frameworks for the type of molecular reference library work that EnviroBiotics is conducting; and the capacity-building mandates may generate funding opportunities for West African molecular biodiversity initiatives. Molecular reference libraries β the core output of this project β are precisely the type of scientific infrastructure needed to implement BBNJ monitoring commitments.