File:Chelonoidis nigra (Galapagos giant tortoise) (15101211644).jpg

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Chelonoidis niger (Quoy & Gaimard, 1824) - Galapagos giant tortoise (mount, Carnegie Museum of Natural History, Pittsburgh, Pennsylvania, USA).

The largest living terrestrial chelonian on Earth is the Galapagos giant tortoise - Chelonoidis niger (often referred to by the subjective junior synonym Geochelone elephantopus). It only occurs on islands of the Galapagos Hotspot in the eastern Pacific Basin. It is a long-lived, very slow-moving herbivore. Terrestrial chelonians tend to have shells of high convexity, presumably for protection from predators.

Classification: Animalia, Chordata, Vertebrata, Reptilia, Anapsida, Chelonia, Testudinidae

The turtles & tortoises (chelonians) are an ancient group of reptiles that have a Triassic to Holocene stratigraphic record. Turtles are most easily recognized by their shell - some forms can retract the head & limbs into the shell when threatened, while other species cannot. Their overall body plan has changed very little since the Triassic - a great example of conservative evolution. Chelonians occur in terrestrial, freshwater, brackish-water, and marine settings.
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Source Chelonoidis nigra (Galapagos giant tortoise)
Author James St. John

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This image was originally posted to Flickr by jsj1771 at https://www.flickr.com/photos/47445767@N05/15101211644. It was reviewed on 3 May 2015 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0.

3 May 2015

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