snapping turtle

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Related to Chelydra: alligator snapping turtle

snapping turtle,

large, aggressive New World freshwater turtleturtle,
a reptile of the order Chelonia, with strong, beaked, toothless jaws and, usually, an armorlike shell. The shell normally consists of bony plates overlaid with horny shields.
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. The two snapping turtle species are the sole members of the family Chelydridae. Snapping turtles prefer quiet, muddy water. They spend most of their time submerged, surfacing periodically to breathe. They feed on fish and other aquatic animals as well as on vegetation and decaying matter; they are valuable scavengers. They have long necks, powerful jaws, and fierce dispositions, lunging at aggressors and biting them. Snapping turtles lay their eggs in the ground in early summer, often at some distance from water. The eggs, about 20 in a clutch, hatch after a 10-week incubation, and the young find their way to water.

The common snapping turtle, or snapper (Chelydra serpentina), is found from SE and S central Canada to NE South America. The adult is often over 18 in. (45 cm) long and weighs over 30 lb (14 kg); some specimens weigh twice as much. The alligator snapper (Macrochelys temmincki) is found in the SE United States and the Mississippi valley. One of the world's largest turtles, it may reach a length of 30 in. (75 cm) and weigh 200 lb (90 kg). It has a muscular, wormlike projection on the tongue, which it uses as a fishing lure as it lies concealed in the mud of a river bottom. In Japan and Europe, where snapping turtles were imported as pets, the turtles have found in the wild and are invasive species.

Snapping turtles are classified in the phylum ChordataChordata
, phylum of animals having a notochord, or dorsal stiffening rod, as the chief internal skeletal support at some stage of their development. Most chordates are vertebrates (animals with backbones), but the phylum also includes some small marine invertebrate animals.
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, subphylum Vertebrata, class Reptilia, order Chelonia, family Chelydridae.

References in periodicals archive ?
Nests, nesting and aerial basking of Macroclemys under natural conditions, and comparisons with Chelydra (Testudines: Chelydridae).
In Apalone spinifera, the elements of the neurocranium ossify between stages 19 and 23 (SHEIL, 2003), in Macrochelys teminckii between stages 21 and 24 (SHEIL, 2005), and in Chelydra serpentina (RIEPPEL, 1993; SHEIL; GREENBAUM, 2005) between stages 21 and 23, indicating that this is the period of longest duration in Podocnemis expansa, since it takes place between stages 19 and 24.
sylvatica, Chelydra serpentina, Chrysemys picta, Emydoidea blandingii, Glyptemys insculpta, Graptemys geographica, Eumeces fasciatus, Diadophis punctatus, Elaphe vulpina, Lampropeltis triangulum, Nerodia sipedon, Opheodrys vernalis, Storeria dekay, S.
Survivorship of adult females in a northern population of common snapping turtles, Chelydra serpentina.
The snapping turtle, Chelydra serpentina, is one of the most broadly distributed chelonians in the world; they occur from southeastern Canada westward to Alberta and throughout the eastern half of the United States and into Central America.
Gans (1979) constatou que, entre os quelonios, as arterias renais de Crysemys e Chelydra penetram no rim centro-dorsalmente, como vasos interlobulares, e arteriolas menores seguem internamente pelos glomerulos capilares.
4% consisted of the following five species: Bufo nebulifer, Syrrhophus marnocki, Trachemys scripta, Chelydra serpentina, and Rana catesbeiana.
Octylphenol (OP) alters the expression of members of the amyleid protein family in the hypothalamus of the snapping turtle, Chelydra serpentina serpentina.
Manitou Notophthalmus viridescens X X X Plethodon cinereus X X X X X Ambystoma laterale X X X Ambystoma maculatum X X Bufo americanus X X X X X X Hyla versicolor X Pseudacris crucifer X X* X X X Rana catesbeiana X X Rana clamitans X X X X Rana sylvatica X X Rana pipiens X X Chelydra serpentina X X X Chrysemys picta X X X X Thamnophis sirtalis X X X X X Thamnophis sauritus X X Nerodia sipedon X X X X X Storeria dekayi X Storeria occipitomaculata X X X Diadophis punctatus X X X X Liochlorophis vernalis X Lampropeltis triangulum X X X X Species Islands S.
5% consisted of Deirochelys reticularia ( Chicken turtles), Apalone spinifera (Spiny softshell turtles), Chelydra serpentina (Common snapping turtles), and Macroclemys temminckii (Alligator snapping turtles).
captures by species Chelydra Sternotherus Chrysemys Site serpentina odoratus picta Cypress Creek NWR 15 3 2 Horseshoe Lake SFWA 39 1 4 Mill Creek 2 0 0 Mississippi River 25 0 0 Big Creek 4 0 0 Mud Creek 3 2 0 Big Muddy River 23 0 0 Tower Island Chute 0 1 0 Mermet Lake SFWA 36 0 9 Bay Creek 15 0 1 Big Grand Pierre Creek 5 0 0 Lusk Creek 19 4 0 Sugar Creek 3 2 0 Cache River SNA 14 0 2 Dutch Creek 10 0 0 LaRue Swamp 5 6 0 Clear Creek 4 0 0 Union County SFWA 21 2 0 Total 243 21 18 No.