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Turtle interesting facts and info… [edit] Turtle, terrapin, or tortoise? In British English it is normal to describe these reptiles as turtles, terrapins, or tortoises, depending on whether they live in the sea, in fresh water, or on land. Thus the green sea turtle, Chelonia mydas, is considered a turtle; the red-eared slider, Trachemys scripta elegans, a terrapin, and the eastern box turtle, Terrapene carolina carolina, a tortoise. In American English it is common to call them "turtles" regardless of habitat, although "tortoise" is used as a more precise term for the land-dwelling species. Ocean-going species are sea turtles. "Terrapin" is reserved for the diamondback terrapin, Malaclemys terrapin, a North American species whose name is derived from the Algonquian word for this animal [1]. Speakers of Australian English tend to use turtle for both marine and freshwater species and tortoise for the terrestrial species. The word chelonian is increasingly popular among veterinarians, scientists, and conservationists working with these animals. It is based on the Greek word ?e?ó?a( /çe'lona/, chelone), meaning tortoise, and is used, for example, by the Chelonian Research Foundation. Geoffroys side-necked turtle P
hrynops geoffroanus lives in tropical pools and lakes in South America[edit] Evolution The first turtles are believed to have existed in the Mesozoic, around 200 million years ago. Their exact ancestry is disputed. It was believed that they are the only surviving branch of the ancient clade Anapsida, which includes groups such as procolophonoids, millerettids, protorothyrids and pareiasaurs. All anapsid skulls lack a temporal opening, (See also: turtle pic florida sea turtles sea turtle inn jacksonville fl green sea turtle photo sea turtle coloring page olive ridley sea turtle information on green sea turtles giant sea turtles sea turtle info endangered green sea turtle sea turtle egg hawaii sea turtles sea turtle inn jacksonville black sea turtles sea turtle image sea turtle jewelry sea turtle anatomy leather) while all other extant amniotes have temporal openings (although in mammals the hole has become the zygomatic arch). Most anapsids became extinct in the late Permian period, except procolophonoids and possibly the precursors of the testudines (turtles). However, it was recently
suggested that the anapsid-like turtle skull may be due to reversion rather than to anapsid descent. More recent phylogenetic studies with this in mind placed turtles firmly within diapsids, slightly closer to Squamata than to Archosauria. All molecular studies have strongly upheld this new phylogeny, though some place turtles closer to Archosauria. Re-analysis of prior phylogenies suggests that they classified turtles as anapsids both because they assumed this classification (most of them studying what sort of anapsid turtles are) and because they did not sample fossil and extant taxa broadly enough for constructing the cladogram. While the issue is far from resolved, most scientists now lean towards a diapsid origin for turtles. [edit] Physical Description
Turtles vary widely in size, although marine turtles tend to be relatively big animals. The largest chelonian is a marine turtle, the great leatherback sea turtle, which can reach a shell length of 200 cm (72 in) and can reach a weight of over 750 kg (2,000 lb). Freshwater turtles are smaller, with the largest species being the Asian softshell turtle Pelochelys bibroni, which has been reported to measure up to 130 cm (51 inches) and weight about 180 kg (400 lb). This dwarfs even the better-known alligator snapping turtle, the largest chelonian in North America, which attains a shell length of up to 80 cm (31.5 in) and a weight of about 76 kg (170 lb). Giant tortoises of the genera Geochelone, Meiolania, and others were relatively widely distributed around the world into prehistor (More for Turtle information, see also: back sea turtles green sea turtle habitat sea turtle drawing plaque sea turtle baby green sea turtles sea turtles live sea turtle tribal tattoo picture of baby sea turtles endangered species sea turtles ridley sea turtle sea turtles food chain flatback sea turtle type of sea turtles sea turtles for kid sea turtle conservation pacific green sea turtle loggerhead sea turtle picture bluffton cinema sea turtle sea turtle species population of sea turtles sea turtle threat)
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