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Northern map turtle
The northern map turtle (''Graptemys geographica''), or common map turtle,〔(Scientific and Standard English Names of Amphibians and Reptiles of North America, North of Mexico ... ), SSARHERPS.org〕 is an aquatic turtle in the family Emydidae. It is endemic to North America. This turtle is kept as a pet.
==Description==
The northern map turtle gets both its common and scientific names from the marking on the skin and carapace. The light markings resemble contour lines on a map or chart.〔(: Status Report of the Northern Map Turtle ) Committee on the Status of Endangered Wildlife in Canada〕 The lines on the carapace are shades of yellow, tan, or orange and are surrounded by dark borders. The rest of the carapace is olive or greyish brown. The carapace markings on older individuals tend to fade but are usually still apparent when the shell is wet. The carapace has a hydrodynamic appearance and is broad with a moderately low keel. The rear of the carapace is flared and the rear marginals form serrations. The plastron is yellowish and is marked by a central dark blotch (plastral figure) that follows the sutures of the plastral scutes and fades with age so that many adults lack a pattern all together (i.e., the plastron is immaculate). The head, neck and limbs are dark olive, brown, or black with thin yellow or green stripes. There is an oval or triangular spot located behind the eye. Like other map turtles, this species exhibits extreme sexual size dimorphism.〔 Males are in carapace length and weigh between , while females are in carapace length and weigh around . Females have a much wider head than males and this is associated with differences in feeding.〔Ernst, C.H., and J.E. Lovich. (2009). ''Turtles of the United States and Canada.'' 2nd Edition. Washington: Smithsonian Institution Press. (''Graptemys geographica'', pp. 293-302.)〕 Males have a narrower carapace with more distinct keel, narrower head, and a longer, thicker tail. Unlike females, the opening of the cloaca is beyond the rear edge of the carapace. Young map turtles have a pronounced dorsal keel. Hatchlings have a round grayish-brown carapace that is about long.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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