Holdridge's Toad

Holdridge's Toad (Bufo holdridgei) was a species of toad endemic to Costa Rica. As of October 2008, it has been declared extinct by the International Union for the Conservation of Nature in its Red List for 2008.

References

Bolaños & Chaves (2004). Bufo holdridgei. 2006. IUCN Red List of Threatened Species. IUCN 2006. www.iucnredlist.org. Retrieved on 11 May 2006. Database entry includes a range map and justification for why this species is critically endangered
Frost, Darrel; Grant, Taran; Faivovich, JuliÁN; Bain, Raoul H.; Haas, Alexander; Haddad, CÉLIO F.B.; De SÁ, Rafael O.; Channing, Alan et al. (2006). "The Amphibian Tree of Life". Bulletin of the American Museum of Natural History 297: 364. doi:10.1206/0003-0090(2006)297[0001:TATOL]2.0.CO;2.
Pauly, G. B., D. M. Hillis, and D. C, Cannatella. (2004) The history of a Nearctic colonization: Molecular phylogenetics and biogeography of the Nearctic toads (Bufo). Evolution 58: 2517–2535.