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Introduction to Reptiles

By

Stephen J. Divers

, BVetMed, DZooMed, DACZM, DECZM (herpetology), FRCVS, University of Georgia

Last full review/revision Aug 2020 | Content last modified Sep 2020

Reptiles can be easily recognized by their horny or scaly skin. The class Reptilia has 4 orders. The order Rhynchocephalia includes only 1 living species, the tuatara, which is native to New Zealand. The order Crocodilia includes alligators, caimans, crocodiles, and gharials (a crocodilian species native to the Indian subcontinent). The order Testudines contains tortoises and turtles, also called chelonians. The order Squamata includes lizards and snakes.

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Disorders of Calcium Metabolism
Calcium, in its ionic form, plays a key role in the function of many body systems. Precise control of calcium ion concentrations in extracellular fluids is regulated by several hormones. Which of the following is NOT involved in calcium homeostasis?
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