turtles @testudinataarchieve - Tumblr Blog

19th century illustration of a world turtle supporting four elephants and the Earth as a hemisphere.

source: "How the Earth was Regarded in Old times", The Popular Science Monthly, Volume 10, part dated March 1877, pp. 542-53, page 544

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Kurmavatara (tortoise incarnation of Vishnu), from Garhwa, Allahabad District

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Diagram of the origins of the turtle body plan through the Triassic: isolated bony plates evolved to form a complete shell, in a sequence involving Pappochelys, Eorhynchochelys, Odontochelys, and Proganochelys.

The key question is how the turtle got its shell. The evidence suggests a gradual development of increasingly large bony plates that eventually joined to form a complete shell.

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The red-eared slider has an exceptional seven types of color-detecting cells in its eyes.

Fritsches, Kerstin A.; Warrant, Eric J. (2013). "Vision". In Wyneken, Jeanette (ed.). The Biology of Sea Turtles. CRC Press. pp. 31–58. ISBN 978-1-4398-7308-3. OCLC 828509848

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Tortoise skeleton cross-section, labelled as infographic. Natural History Museum, London

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World distribution of turtles

(Order Testudines), after data from Cogger, H.G & Zweifel, R.G. (1998). "Reptiles & Amphibians". ISBN 0121785602. Black is land with turtles, blue sea with turtles. Gray is land without, white water without.

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