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Megalochelys ("great turtle") is an extinct genus of tortoises that lived from the Miocene to Pleistocene.They are noted for their giant size, the largest known for any tortoise, with a maximum carapace length of over 2 m (6.5 ft) in M. atlas.
Chelonoidis niger chathamensis, commonly known as the Chatham Island giant tortoise or the San Cristóbal giant tortoise, is a subspecies of Galápagos tortoise endemic to San Cristóbal Island in the Galápagos.
Chelonoidis niger vicina, commonly known as the Cerro Azul giant tortoise, Iguana Cove tortoise or the Isabela Island giant tortoise, is a subspecies of Galápagos tortoise endemic to Isabela Island in the Galápagos.
Aldabrachelys [1] is genus of giant tortoises, including the Aldabra giant tortoise (Aldabrachelys gigantea) native to the Seychelles, as well as two extinct species, Aldabrachelys abrupta and Aldabrachelys grandidieri known from Madagascar.
Chelonoidis niger guentheri, commonly known as the Sierra Negra giant tortoise or Günther's giant tortoise, is a subspecies of Galápagos tortoise endemic to the Galápagos archipelago in the eastern Pacific Ocean. The specific epithet guentheri honours zoologist Albert Günther.
C. n. duncanensis – Pinzon Island giant tortoise [2] C. n. guntheri – Sierra Negra giant tortoise [2] C. n. hoodensis – Hood Island giant tortoise [2] C. n. microphyes – Volcán Darwin giant tortoise [2] † C. n. niger – Floreana giant tortoise (driven to extinction in the mid-19th century, but could be bred back from hybrids) [2]
The closest living relative (though not a direct ancestor) of the Galápagos giant tortoise is the Chaco tortoise (Chelonoidis chilensis), a much smaller subspecies from South America. The divergence between C. chilensis and C. niger probably occurred 11.95–25 million years ago, an evolutionary event preceding the volcanic formation of the ...
Chelonoidis niger vandenburghi, also known as the Volcán Alcedo giant tortoise, the Alcedo Volcano giant tortoise or the Alcedo giant tortoise, is a subspecies of Galápagos tortoise endemic to the Galápagos archipelago in the equatorial eastern Pacific Ocean. The specific epithet vandenburghi honours American herpetologist John Van Denburgh. [3]