British Virgin Islands
The most spectacular reptile found only in the British Virgin Islands is the critically endangered Anegada Ground Iguana Cyclura pinguis (ARKive), now reduced to fewer than 200 individuals. At only 32 mm in length, the Virgin Gorda Least Gecko Sphaerodactylus parthenopion (Wikipedia) is one of the world's smallest lizards. Other reptiles unique to the islands include the Carrot Rock Anole Anolis ernestwilliamsi (caribherp), the Carrot Rock Skink Mabuya (or Spondylurus) macleani (Google Books), the Anegada Skink Spondylurus anegadae (flickr), and two blindsnakes: Typhlops naugus (caribherp) and Typhlops catapontus (p. 135 of IRF pdf file).
sole endemic frog, the Virgin
Islands Coqui Eleutherodactylus
formerly also lived in the U.S.
Virgin Islands, but now survives only on Tortola, Jost Van
Dyke, and Virgin
Invertebrates unique to the British Virgin Islands include a longhorned beetle Styloleptoides inflaticollis (eol), the Anegada Calisto Calisto anegadensis (Butterflies of America), the Anegada Skipperling Copaeodes eoa (Butterflies of America), an owlet moth Perigea gloria (BOLD), a braconid wasp Coiba guanaensis (fig. 34 on p.10 of Ent. Soc. Wash. 5 MB pdf file), the goblin spiders Longoonops gorda (AMNH) and Stenoonops tortola (AMNH), a caponiid spider Nops finisfurvus (Zootaxa pdf file), a centipede Polycricus bredini (CHILOBASE), and several shrimps: Pseudalpheopsis guana (STRI), Alpheus zimmermani (STRI), and Microprosthema jareckii (AToL Decapoda pdf file).
Plants occurring only on Anegada include the Poke-me-boy Acacia (or Vachellia) anegadensis (Kew) and the Wire Wist Metastelma anegadense (ARKive). Pitcairnia jareckii (BHL) is a bromeliad known only from Guana Island. Kiaerskov’s Lidflower Calyptranthes kiaerskovii (ARKive), formerly known also from Puerto Rico, may now survive only on Virgin Gorda and Tortola.
An overview of the natural history of this territory of the United Kingdom is provided by the JNCC (JNCC pdf file) and it is part of the Caribbean Islands biodiversity hotspot (CEPF).