Santiago Island giant tortoise Temporal range: Miocene - Recent^[1]^[2]

Conservation status
Critically Endangered (IUCN 3.1)^[3]
CITES Appendix I (CITES)^[4]
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Reptilia
Order:	Testudines
Suborder:	Cryptodira
Superfamily:	Testudinoidea
Family:	Testudinidae
Genus:	Chelonoidis
Species:	C. niger
Subspecies:	C. n. darwini
Trinomial name
*Chelonoidis niger darwini* (Van Denburgh, 1907)^[5]
Synonyms^[6]
Testudo darwini Van Denburgh, 1907 Testudo elephantopus darwini — Mertens & Wermuth, 1955 Geochelone elephantopus darwini — Pritchard, 1967 Geochelone nigra darwini — Iverson, 1992 Chelonoidis nigra darwini — David, 1994 Geochelone darwini — Cisneros-Heredia, 2006 Chelonoidis darwini — Rhodin et al., 2010

The Santiago Island giant tortoise (Chelonoidis niger darwini), also known commonly as the Santiago giant tortoise^[3] and the James Island tortoise, is a subspecies of Galápagos tortoise in the family Testudinidae. The subspecies is endemic to Santiago Island (also known as James Island and San Salvador) in the Galápagos.

Population history

Large numbers of C. n. darwini were removed from Santiago Island in the early 19th century by whaling vessels, and introduced goats reduced the coastal lowlands to deserts, restricting the remaining tortoises to the interior. The sex ratio is strongly imbalanced in favour of the males, and most nests and young are destroyed by feral pigs. Some nests are now protected by lava corrals, and since 1970, eggs have been transported to the Charles Darwin Research Station for hatching and rearing. Release programs and measures for nest protection from feral pigs have been successful.^[7] There are approximately 1,165 individuals in the wild, with an increasing population.^[3]

Habitat

The preferred natural habitats of C. n. darwini are forest and shrubland.^[3]

Description

The gray to black carapace of C. n. darwini is intermediate in shape between the saddle-backed subspecies and the domed subspecies of Galápagos tortoises. It has only a shallow cervical indentation. The anterior carapacial rim is not appreciably upturned, and the posterior marginals are flared, slightly upturned, and slightly serrated.^{[citation needed]}

Diet

C. n. darwini grazes on low-growing vegetation.^[3]

Etymology

The specific name, darwini, is in honor of English naturalist Charles Darwin.^[6]

References

External links

Tortoise family

Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Subclass: Anapsida
Order: Testudines
Suborder: Cryptodira
Superfamily: Testudinoidea
Family: Testudinidae

Genera

Species of the tortoise family

Agrionemys

Russian tortoise

Chaco tortoise
Red-footed tortoise
Yellow-footed tortoise
†Chelonoidis alburyorum
†Chelonoidis cubensis
†Chelonoidis lutzae
†Chelonoidis monensis
†Chelonoidis sellovii
†Chelonoidis sombrerensis

Galápagos tortoise

Chelonoidis complex

†Cheirogaster

†Cheirogaster bacharidisi
†Cheirogaster gymnesica
†Cheirogaster schafferi

Chersina

Angulate tortoise

†Hadrianus

†Hadrianus corsoni
†Hadrianus majusculus
†Hadrianus octonaria
†Hadrianus robustus
†Hadrianus schucherti
†Hadrianus utahensis
†Hadrianus vialovi

†Hesperotestudo

†Hesperotestudo percrassa

Pancake tortoise

Leopard tortoise

†Stylemys

†Stylemys botti
†Stylemys calaverensis
†Stylemys canetotiana
†Stylemys capax
†Stylemys conspecta
†Stylemys copei
†Stylemys emiliae
†Stylemys frizaciana
†Stylemys karakolensis
†Stylemys nebrascensis
†Stylemys neglectus
†Stylemys oregonensis
†Stylemys pygmea
†Stylemys uintensis
†Stylemys undabuna

Testudo

Phylogenetic arrangement of turtles based on turtles of the world 2017 update: Annotated checklist and atlas of taxonomy, synonymy, distribution, and conservation status. Key: †=extinct.

Testudines

Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Clade: Diapsida
Order: Testudines

Genus

Chelonioidea
(Sea turtles)

Cheloniidae	†Allopleuron Caretta †Carolinochelys Chelonia †Eochelone Eretmochelys †Gigantatypus †Glarichelys †Itilochelys Lepidochelys †Mexichelys †Miocaretta Natator †Pacifichelys †Syllomus †Tasbacka
Dermochelyidae	†Arabemys †Corsochelys †Cosmochelys Dermochelys †Eosphargis †Mesodermochelys †Psephophorus
	†Euclastes †Peritresius †Procolpochelys †Protosphargis †Puppigerus

Kinosternoidea

Dermatemydidae	Dermatemys
Kinosternidae	Claudius †Hoplochelys Kinosternon Staurotypus Sternotherus

Testudinoidea

Emydidae	†Acherontemys Chrysemys Clemmys Deirochelys Emys Actinemys Emydoidea Glyptemys Graptemys Malaclemys Pseudemys Terrapene Trachemys †Wilburemys
Geoemydidae	Batagur †Banhxeochelys Cuora Cyclemys Geoclemys Geoemyda Hardella Heosemys Leucocephalon Malayemys Mauremys Melanochelys Morenia Notochelys Orlitia Pangshura Rhinoclemmys Sacalia Siebenrockiella Vijayachelys
Platysternidae	Platysternon
Testudinidae	Aldabrachelys Astrochelys Centrochelys Chelonoidis Chersina Cylindraspis †Cymatholcus †Floridemys Geochelone Gopherus †Hadrianus †Hesperotestudo Homopus Indotestudo Kinixys Malacochersus Manouria †Megalochelys †Oligopherus Psammobates Pyxis †Solitudo Stigmochelys †Stylemys Testudo

Trionychia

Carettochelyidae	†Allaeochelys †Anosteira Carettochelys
Trionychidae	Amyda Apalone †Axestemys Chitra Cyclanorbis Cycloderma †Drazinderetes Dogania †Gilmoremys †Hutchemys †Khunnuchelys Lissemys Nilssonia Palea †Palaeoamyda Pelochelys Pelodiscus Rafetus Trionyx
	†Basilochelys †Sinaspideretes

Chelydridae	Chelydra †Chelydrops †Chelydropsis †Emarginachelys †Macrocephalochelys Macrochelys †Planiplastron †Protochelydra
†Nanhsiungchelyidae	†Anomalochelys †Basilemys †Jiangxichelys
†Protostegidae	†Alienochelys †Archelon †Atlantochelys †Bouliachelys †Calcarichelys †Cratochelone †Desmatochelys †Iserosaurus †Notochelone †Ocepechelon †Pneumatoarthrus †Protostega †Rhinochelys †Santanachelys †Terlinguachelys
	†Adocus †Argillochelys †Bashuchelys †Ctenochelys †Prionochelys †Toxochelys

Pleurodira

†Araripemydidae	†Araripemys
†Bothremydidae	†Araiochelys †Arenila †Azabbaremys †Bothremys †Cearachelys †Chedighaii †Chupacabrachelys †Eotaphrosphys †Foxemys †Galianemys †Ilatardia †Inaechelys †Itapecuruemys †Jainemys †Kinkonychelys †Kurmademys †Labrostochelys †Nigeremys †Phosphatochelys †Polysternon †Puentemys †Rosasia †Rhothonemys †Sankuchemys †Taphrosphys †Ummulisani †Zolhafah
Chelidae	Acanthochelys Chelodina Chelus Elseya Elusor Emydura Hydromedusa †Lomalatachelys Mesoclemmys Myuchelys Phrynops Platemys †Prochelidella Pseudemydura Rheodytes Rhinemys †Yaminuechelys
Pelomedusidae	Pelomedusa Pelusios
Podocnemididae	†Albertwoodemys †Bauruemys †Brontochelys †Caninemys †Carbonemys †Cerrejonemys †Cordichelys Erymnochelys †Lapparentemys †Latentemys Peltocephalus Podocnemis †Stupendemys
†Sahonachelyidae	†Sahonachelys †Sokatra

	†Caribemys †Caririemys †Tacuarembemys

Phylogenetic arrangement of turtles based on Turtles of the World 2017 Update: Annotated Checklist and Atlas of Taxonomy, Synonymy, Distribution, and Conservation Status. † = extinct.

See also List of Testudines families

Taxon identifiers

Taxon identifiers
Chelonoidis darwini	Wikidata: Q2854422 CoL: TVL7 GBIF: 7758793 iNaturalist: 146003 ITIS: 949451 IUCN: 9020 NCBI: 106726 Open Tree of Life: 564318 RD: darwini
Testudo darwini	Wikidata: Q50380515 GBIF: 2441592 IRMNG: 10782847