Birds found nowhere else than in Equatorial Guinea are the Bioko Speirops (HBW) (CSIC), the Annobon Scops Owl (HBW), and the Annobon White-eye (HBW) (CSIC). The Fernando Po Batis Batis poensis (HBW) is also often considered a full species distinct from the West African Batis Batis occulta and the Annobon Paradise Flycatcher Terpsiphone smithii is sometimes considered distinct from the more widespread Red-bellied Paradise Flycatcher Terpsiphone rufiventer (HBW).
is the sole home of
what are sometimes considered two full primate species, the Bioko Red Colobus (bioko.org)
the Bioko Squirrel Galago (CSIC)
and several more endemic subspecies: the Drill (bioko.org),
Red-eared Guenon (bioko.org),
Crowned Guenon (bioko.org),
and the Putty-nosed Guenon (bioko.org).
Additional endemic mammals include Eisentraut’s
Mouse Shrew (Planet'
the Bioko Forest Shrew (Planet'
and Father Basilio's Striped Mouse (Planet'
The Bioko Blue Duiker Philantomba melanorheus (Facebook)
a full species.
Reptiles unique to Equatorial Guinea include Girard’s Green Snake Philothamnus girardi (ggcg.st), the Bioko Montane Chameleon Chamaeleo (or Trioceros) feae (flickr), the Bioko Leaf-toed Gecko Hemidactylus biokoensis (Species New to Science), the Annobon Leaf-toed Gecko Hemidactylus aporus (Internet Archive), Newton's Leaf-toed Gecko Hemidactylus newtoni (BHL), a skink from Bioko Scelotes poensis (Reptile Database), and the Annobon Lidless Skink Panaspis (or Afroablepharus) annobonensis (Reptile Database).
The Musole Forest Treefrog Leptopelis brevipes (fig. 4 at BHL) and the recently described Bioko Squeaker Frog Arthroleptis bioko (eol) are known solely from Bioko. Several undescribed frogs have also been recently discovered on Bioko (guineaecuatorialpress.com).
Freshwater fish known only from Equatorial Guinea include a catfish Microsynodontis nannoculus (PlanetCatfish), a sleeper goby Eleotris annobonensis (p. 12 of IRD pdf file), and several killifish: Fundulopanchax avichang (Killifish of West Africa), Fundalopanchax oeseri (Killifish of West Africa), and the recently described Aphyosemion ecucuense (Killifish of West Africa) and Aphyosemion erythron (Killifish of West Africa). Marine fishes known only by single specimens caught off Annobon include Pseudogramma guineensis (FishBase) and a scorpionfish Scorpaena annobonae (BHL).
Butterflies found solely in Equatorial Guinea include Cymothoe owassae (BOLD), Epitola insulana (Naturhistorhiska riksmuseet), Euphaedra alava (metafro), Euphaedra canui (metafro), and Euriphene canui (metafro). Other endemic insects include the silk moths Lobobunaea vingerhoedti (BOLD) and Goodia canui (BOLD), a hawk moth Pseudoclanis biokoensis (BOLD), a bush cricket Eulioptera insularis (OSF), a longhorned beetle Acutandra camiadei (p. 77 of CSE pdf file), Aa scavenger scarab beetle Melanophilharmostes poggii (ResearchGate), a minute moss beetle Hydraena pagaluensis (flickr), a seed bug Dieuches annobonensis (Naturhistorhiska riksmuseet), and the ants Hypoponera pulchra (AntWiki) and Strumigenys nimravida (AntWiki).
endemic invertebrates include the Bioko Baboon Spider Hysterocrates
a jumping spider Tomomingi
Spiders), a goblin spider Triaeris moca (AMNH),
a harvestman Mbinia
xenophora (fig 3 at SciELO),
land snails Ptychotrema
and Gulella pooensis
and the marine snails Mitrella
and Alvania gascoignei
Chonopetalum stenodictyum (BHL) is an endemic genus of vascular plant. Endemic orchids include Polystachya reticulata and Polystachya engongensis (both at ResearchGate pdf file) and Genyorchis saccata (JSTOR). Other endemic plants include Turraea glomeruliflora and Discoclaoxylon pubescens (both at a Flora de Guineal Ecuatorial), a fig Ficus annobonensis (JSTOR), Begonia aequatoguineensis (Flora de Guineal Ecuatorial pdf file), Bertiera annobonensis (JSTOR), Solanecio lainzii (JSTOR), Schoenoplectus heptangularis (Flora de Guineal Ecuatorial), a riverweed Macropodiella uoroensis (MNHN pdf file), a ginger Renealmia mannii (JSTOR), Cyathula fernandopoensis (Kew), Crossandrella cristalensis (JSTOR), Afroligusticum townsendii (JSTOR), a fern Asplenium annobonense (Flora de Guineal Ecuatorial), a quillwort Isoetes spinulospora (JSTOR), a mistletoe Viscum grandicaule (JSTOR), Acalphya annobonae (Internet Archive), and Cassipourea annobonensis (Flora de Guineal Ecuatorial).
Bioko and Annobon are both included in the Guinean Forests of West Africa biodiversity hotspot (CEPF) and the Gulf of Guinea Islands coral reef hotspot (Columbia Univ. pdf file). Important terrestrial ecoregions in Equatorial Guinea include the Cross-Sanaga-Bioko Coastal Forests (WWF), the Mount Cameroon and Bioko Montane Forests (WWF), and the Sao Tome, Principe and Annobon Moist Lowland Forests (WWF). The Southern Gulf of Guinea Drainages is an important freshwater ecoregion (FEOW).