The Navassa curly-tailed lizard or Navassa curlytail lizard (''Leiocephalus eremitus'') is an

extinct Extinction is the termination of a kind of organism or of a group of kinds (taxon), usually a species. The moment of extinction is generally considered to be the death of the last individual of the species, although the capacity to breed and ...

lizard Lizards are a widespread group of squamate reptiles, with over 7,000 species, ranging across all continents except Antarctica, as well as most oceanic island chains. The group is paraphyletic since it excludes the snakes and Amphisbaenia alt ...

species In biology, a species is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of the appropriate s ...

from the

family Family (from la, familia) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). The purpose of the family is to maintain the well-being of its ...

curly-tailed lizard Leiocephalidae, also known as the curlytail lizards or curly-tailed lizards, is a family of iguanian lizards restricted to the West Indies. One of the defining features of these lizards is that their tail often curls over. They were previously ...

(

Leiocephalidae Leiocephalidae, also known as the curlytail lizards or curly-tailed lizards, is a family of iguanian lizards restricted to the West Indies. One of the defining features of these lizards is that their tail often curls over. They were previously ...

). It is known only from the

holotype A holotype is a single physical example (or illustration) of an organism, known to have been used when the species (or lower-ranked taxon) was formally described. It is either the single such physical example (or illustration) or one of several ...

, a female specimen from which it was described in 1868. A possible second specimen which was collected by

Rollo Beck Rollo Howard Beck (26 August 1870 – 22 November 1950) was an American ornithologist, bird collector for museums, and explorer. Beck's petrel and three taxa of reptiles are named after him, including a subspecies of Galápagos tortoise, ''Chelon ...

in 1917 was instead identified as a Tiburon curly-tailed lizard (''Leiocephalus melanochlorus'') by

herpetologist Herpetology (from Greek ἑρπετόν ''herpetón'', meaning "reptile" or "creeping animal") is the branch of zoology concerned with the study of amphibians (including frogs, toads, salamanders, newts, and caecilians (gymnophiona)) and rept ...

Richard Thomas in 1966.

Geographic range

''Leiocephalus eremitus'' was

endemic Endemism is the state of a species being found in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also found elsew ...

Navassa Island Navassa Island (; ht, Lanavaz; french: l'île de la Navasse, sometimes ) is a small uninhabited island in the Caribbean Sea. Located northeast of Jamaica, south of Cuba, and west of Jérémie on the Tiburon Peninsula of Haiti, it is subject to ...

Description

The size of the holotype is given as

snout–vent length Snout–vent length (SVL) is a morphometric measurement taken in herpetology from the tip of the snout to the most posterior opening of the cloacal slit (vent)."direct line distance from tip of snout to posterior margin of vent" It is the most c ...

(SVL). The head and

ventral scales In snakes, the ventral scales or gastrosteges are the enlarged and transversely elongated scales that extend down the underside of the body from the neck to the anal scale. When counting them, the first is the anteriormost ventral scale that conta ...

are smooth. The

dorsal scales In snakes, the dorsal scales are the longitudinal series of plates that encircle the body, but do not include the ventral scales. Campbell JA, Lamar WW (2004). ''The Venomous Reptiles of the Western Hemisphere''. Ithaca and London: Comstock Publis ...

are larger than the scales on the flanks and the ventral scales. The dorsum is dark gray with nine dark transverse bars. The tail is pale with transverse bars on the basal half and uniformly dark gray to black on the posterior half. Throat, breast, belly and the extremities are brown with pale-tipped scales.

Behavior and habitat

Navassa has

xeric Deserts and xeric shrublands are a biome defined by the World Wide Fund for Nature. Deserts and xeric (ancient Greek xērós, “dry") shrublands form the largest terrestrial biome, covering 19% of Earth's land surface area. Ecoregions in this h ...

forest vegetation, but nothing specific is known about biology of this species. The reason for its extinction is also unknown, but predation by cats is a possible reason.

References

* Schwartz, A., and R.W. Henderson. 1991. ''Amphibians and Reptiles of the West Indies: Descriptions, Distributions, and Natural History''. Gainesville, Florida: University Press of Florida. . * Powell, R. 1999. Herpetology of Navassa Island, West Indies. ''Caribbean J. Sci.'' 35 (1-2): 1-13
PDF fulltext

External links

Photograph of the holotype
{{Taxonbar, from=Q310820 Leiocephalus Reptile extinctions since 1500 Extinct reptiles Endemic fauna of Navassa Island Species known from a single specimen Extinct animals of Haiti Extinct animals of the United States Reptiles described in 1868 Taxa named by Edward Drinker Cope Taxonomy articles created by Polbot

Geographic range

Description

Behavior and habitat

References

Further reading

External links