Arnold's giant tortoise

Arnold's giant tortoise
Arnold's giant tortoise
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Sauropsida
Order: Testudines
Suborder: Cryptodira
Family: Testudinidae
Genus: Aldabrachelys
Species: A. arnoldi
Binomial name
Aldabrachelys arnoldi
Bour, 1982

Arnold's giant tortoise (Aldabrachelys arnoldi), also known as the Seychelles saddle-backed tortoise, inhabited the granitic Seychelles islands until around 1840, when it was presumed to be extinct, along with the Seychelles giant tortoise; a species which shared the same islands.

The report of oddly-shaped of tortoises in captivity in the mid-1990s prompted the Nature Protection Trust of Seychelles to investigate the identity of these captive tortoises. Examination of museum specimens of the 'extinct' Seychelles and Arnold species seemed to confirm some living tortoises do show characteristics of the supposedly extinct species. However, some recently published scientific papers on the genetics of the Seychelles and Indian Ocean tortoises provide conflicting results. Some studies suggest only one species was ever present in the islands, whilst others suggest three distinct, but closely related species.

These different views derive from studies of different genes. A synthesis of all available genetic data indicates Arnold's tortoise is genetically the most distinctive Dipsochelys tortoise. This fits with the ecology and morphology of the species, as a highly distinctive tortoise adapted to feeding on low vegetation rather than the grazing habits of the Seychelles giant tortoise and Aldabra giant tortoise. Due to its unusual 'saddlebacked' shape, this is the only Seychelles tortoise species that regularly basks in the sun. The other species will do so occasionally, but Arnold's tortoises rapidly lose heat from the skin of their exposed necks and need to heat up in the sun in the mornings.

A captive breeding program was established in 1997, and in December 2006, the five adult tortoises were returned to the wild on Silhouette Island, forming the first wild population of this species since the early 19th century.

References

External links


Wikimedia Foundation. 2010.

Игры ⚽ Нужна курсовая?

Look at other dictionaries:

  • Arnold's Giant Tortoise — Taxobox name = Arnold s Giant Tortoise status = EW status system = iucn2.3 regnum = Animalia phylum = Chordata classis = Sauropsida ordo = Testudines subordo = Cryptodira familia = Testudinidae genus = Dipsochelys species = D. arnoldi binomial =… …   Wikipedia

  • Giant tortoise — Taxobox name = Giant Tortoise image width = 200px image caption = Galápagos Giant Tortoise regnum = Animalia phylum = Chordata classis = Sauropsida ordo = Testudines subordo = Cryptodira familia = TestudinidaeGiant tortoises are characteristic… …   Wikipedia

  • Aldabra giant tortoise — Conservation status …   Wikipedia

  • Aldabra Giant Tortoise — Taxobox name = Aldabra Giant Tortoise status = VU status system = iucn2.3 image width = 200px regnum = Animalia phylum = Chordata classis = Sauropsida ordo = Testudines subordo = Cryptodira familia = Testudinidae genus = Geochelone species = G.… …   Wikipedia

  • Tortoise — Taxobox name = Tortoises image width = 250px image caption = A Galápagos Giant Tortoise regnum = Animalia phylum = Chordata classis = Reptilia ordo = Testudines subordo = Cryptodira superfamilia = Testudinoidea familia = Testudinidae subdivision… …   Wikipedia

  • Galápagos tortoise — Conservation status …   Wikipedia

  • Dipsochelys — Seychelles giant tortoise Scientific classification Kingdom …   Wikipedia

  • Silhouette Island — lies 20 km northwest of Mahé in the Seychelles. It is the third largest island in the Seychelles. It has an area of 20 km² and has a population of 135, mostly workers on the island. The main settlement is La Passe, where there is a hotel for… …   Wikipedia

  • Cylindraspis — Skull of Cylindraspis sp. (Mauritius). Scientific classification Kingdom …   Wikipedia

  • Aldabra-Riesenlandschildkröte — Aldabra Riesenschildkröte Aldabra Riesenschildkröte (Aldabrachelys gigantea) Systematik Klasse: Reptilien (Reptilia) …   Deutsch Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”