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 ?
Road mortality of snapping turtles, Chelydra serpentina, in central Ontario during their nesting period.
Nests, nesting and aerial basking of Macroclemys under natural conditions, and comparisons with Chelydra (Testudines: Chelydridae).
Acris crepitans Pseudacris clarki Reptilia Testudines Chelydra serpentina 3 1 2 43 Pseudemys texana 3 23 Sternothorus odoratus 1 2 Trachemys scripta 2 2 66 Trionyx spp.
Para nidos de Chelydra serpentina, Kolben & Janzen (2002) encontraron que la probabilidad de supervivencia de sus nidos incremento cuando disminuia la cobertura vegetal.
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.
The remaining 5% consisted of Deirochelys r eticularia (Chicken turtles), Apalone spinifera (Spiny softshell turtles), Chelydra serpentina (Common snapping turtles), and Macroclemmys temminickii (Alligator snapping turtles).
fiavescens (Iverson 1991b), Chelydra serpentina (Congdon et al.
Sanganois Session 1 Session 2 Species Cage Net Cage Net Trachemys scripta 41 50 74 129 Apalone spinifera 1 13 0 13 Chrysemys picta 0 5 2 12 Chelydra serpentina 0 1 0 2 Sternotherus odoratus 0 4 1 2 Graptemys ouachitensis 0 0 0 0 Apalone mutica 0 0 0 0 Combined 42 73 77 158 New Salem Session 1 Session 2 Species Cage Net Cage Net Trachemys scripta 14 8 4 4 Apalone spinifera 1 0 2 3 Chrysemys picta 2 2 3 1 Chelydra serpentina 0 4 0 1 Sternotherus odoratus 0 0 0 0 Graptemys ouachitensis 0 1 0 0 Apalone mutica 0 0 0 2 Combined 17 15 9 11 Table 2.
A la par de este evento, se realizo una pequena exhibicion de tres vitrinas con material procedente del deposito de Historia Natural, presentando ejemplares disecados de tigrillo (Leoparduspardalis), un Quetzal andino (Pharomachrus auriceps), dos colibries (Ocreatus underwoodi, Eutoxeres aquila), y una seleccion de herpetos (Crotalus dorissus y Chelydra acutirostris) (ver foto anexa).