The Jaragua forest lizard (''Guarocuyus jaraguanus'') is a

species A species () is often defined as the largest group of organisms in which any two individuals of the appropriate sexes or mating types can produce fertile offspring, typically by sexual reproduction. It is the basic unit of Taxonomy (biology), ...

lizard Lizard is the common name used for all Squamata, squamate reptiles other than snakes (and to a lesser extent amphisbaenians), encompassing over 7,000 species, ranging across all continents except Antarctica, as well as most Island#Oceanic isla ...

of the

family Family (from ) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). It forms the basis for social order. Ideally, families offer predictabili ...

Diploglossidae Diploglossidae is a family of anguimorph lizards native to the Americas, with most genera being endemic to Hispaniola. Most members of this family (aside from the legless genus '' Ophiodes'') are known as galliwasps. They were formerly considere ...

endemic Endemism is the state of a species being found only 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 foun ...

to the

Dominican Republic The Dominican Republic is a country located on the island of Hispaniola in the Greater Antilles of the Caribbean Sea in the Atlantic Ocean, North Atlantic Ocean. It shares a Maritime boundary, maritime border with Puerto Rico to the east and ...

on the

Caribbean The Caribbean ( , ; ; ; ) is a region in the middle of the Americas centered around the Caribbean Sea in the Atlantic Ocean, North Atlantic Ocean, mostly overlapping with the West Indies. Bordered by North America to the north, Central America ...

island of

Hispaniola Hispaniola (, also ) is an island between Geography of Cuba, Cuba and Geography of Puerto Rico, Puerto Rico in the Greater Antilles of the Caribbean. Hispaniola is the most populous island in the West Indies, and the second-largest by List of C ...

Taxonomy

It is the only member of the genus ''Guarocuyus''. It was named in honor of the

Taíno The Taíno are the Indigenous peoples of the Caribbean, Indigenous peoples of the Greater Antilles and surrounding islands. At the time of European contact in the late 15th century, they were the principal inhabitants of most of what is now The ...

cacique A cacique, sometimes spelled as cazique (; ; feminine form: ), was a tribal chieftain of the Taíno people, who were the Indigenous inhabitants of the Bahamas, the Greater Antilles, and the northern Lesser Antilles at the time of European cont ...

Enriquillo Enrique (1498–1535), best known as Enriquillo, was a Taíno people, Taíno cacique who rebelled against the Spaniards between 1519 and 1533. Enriquillo's rebellion is the best known rebellion of the early Caribbean period. He was born on the ...

, whose indigenous name is thought to have been "Guarocuya". Being both a monotypic genus and species restricted to a single island and described only in 2022, ''G. jaraguanus'' is unique among recently-described reptiles. It is the

sister group In phylogenetics, a sister group or sister taxon, also called an adelphotaxon, comprises the closest relative(s) of another given unit in an evolutionary tree. Definition The expression is most easily illustrated by a cladogram: Taxon A and ...

to the clade containing the genera ''

Celestus ''Celestus'' is a genus of diploglossid lizards mostly endemic to Jamaica (aside from a single species endemic to Haiti) and containing about 11 species, though three of these may be extinct. They are commonly known as galliwasps although the o ...

'', '' Comptus'', and '' Panolopus'' (the latter two of which were previously considered synonymous with ''Celestus'' until 2021).

Description

It is unique among celestines due to its nocturnal,

arboreal Arboreal locomotion is the locomotion of animals in trees. In habitats in which trees are present, animals have evolved to move in them. Some animals may scale trees only occasionally (scansorial), but others are exclusively arboreal. The hab ...

habits with a semi-

prehensile tail A prehensile tail is the tail of an animal that has Adaptation (biology), adapted to grasp or hold objects. Fully Prehensility, prehensile tails can be used to hold and manipulate objects, and in particular to aid arboreal creatures in finding and ...

and webbed toes.

Distribution and habitat

It is found in the Dominican Republic, where it is known only from two small, adjacent

keys Key, Keys, The Key or The Keys may refer to: Common uses * Key (cryptography), a piece of information needed to encode or decode a message * Key (instrument), a component of a musical instrument * Key (lock), a device used to operate a lock * ...

in the Laguna de Oviedo, a lagoon in

Jaragua National Park Jaragua National Park () is a Dominican national park located in Pedernales Province, in the extreme southwest of the Dominican Republic. Jaragua has a total area of 1,374 km² (905 km² of which are offshore marine habitats), the largest such pro ...

References

{{Taxonbar, from=Q116439869 Diploglossidae Reptiles of the Dominican Republic Endemic fauna of the Dominican Republic Monotypic lizard genera