- Common Snapping Turtle
Taxobox
name = Common Snapping Turtle
status = NE
regnum =Animal ia
phylum = Chordata
classis = Reptilia
ordo =Testudines
familia =Chelydridae
genus = "Chelydra"
species = "C. serpentina"
binomial = "Chelydra serpentina"
binomial_authority = (Linnaeus, 1758)The Common Snapping Turtle ("Chelydra serpentina") is a large freshwater
turtle of the family Chelydridae. Its natural range extends from southeasternCanada south, west to theRocky Mountains (and beyond, where introduced), throughoutMexico , and as far south asEcuador . This species and the largerAlligator Snapping Turtle are both widely referred to as snapping turtles or snappers (though the Common Snapping Turtle, as its name implies, is much more widespread overall).Common snappers are noted for their belligerent dispositions when out of the water, their powerful beak-like jaws and their highly mobile head and neck (hence the specific name "serpentina"," meaning "
snake -like"). In some areas they are hunted heavily for their meat, a popular ingredient inturtle soup . These turtles have lived for up to 47 years in captivity, while the lifespan of wild individuals is estimated to be around 30 years.cite web|url=http://animaldiversity.ummz.umich.edu/site/accounts/information/Chelydra_serpentina.html|title=Chelydra serpentina: Information|last=Bosch|first=A.|date=2003|publisher=Animal Diversity Web|accessdate=2008-07-20]Anatomy and morphology
"Chelydra serpentina" have rugged, muscular builds with ridged carapaces (though ridges tend to be more pronounced in younger individuals). The
carapace (upper shell) length in adulthood may be nearly 50 cm (20inch es), though 25-47cm, or 10-18.5 inches, is more commoncite book |last=Kindersley |first= Dorling |year=2001,2005 |title=Animal |location=New York City |publisher=DK Publishing |isbn=0-7894-7764-5] , with "C. serpentina" and its subspecies commonly weighing 4.5-16 kg (10-35 lb). Exceptionally large (often captive and overfed) individuals may reach 34 kg (75 lb).Ecology and life history
Common habitats are shallow
pond s, shallow lakes, orstreams . Some may inhabit brackish environments, such as estuaries. Common Snapping Turtles sometimes bask -- though rarely observed -- by floating on the surface with only their carapace exposed, though in the northern parts of their range they will also readily bask on fallen logs in early spring. In shallow waters, Common snappers may lie beneath a muddy bottom with only the head exposed, stretching their long necks to the surface for an occasional breath (note that their nostrils are positioned on the very tip of the snout, effectively functioning as snorkels). Snapping turtles areomnivore s, consuming both plant and animal matter, and are important aquatic scavengers; but they are also active hunters that prey on anything they can swallow, including manyinvertebrate s,fish ,frog s,reptile s (including snakes and smaller turtles), unwarybird s and smallmammal s.Snappers will travel extensively overland to reach new
habitat or to lay eggs. Pollution, habitat destruction, food scarcity, overcrowding and other factors will drive snappers to move overland; it is quite common to find them traveling far from the nearest water source. This species mates from April through November, with their peak laying season in June and July. The female can hold sperm for several seasons, utilizing it as necessary. Females travel over land to find sandy soil in which to lay their eggs, often some distance from the water. After digging a hole, the female typically deposits 25 to 80 eggs each year, guiding them into the nest with her hind feet and covering them with sand forincubation and protection. Incubation time is temperature-dependent, ranging from 9 to 18 weeks. In cooler climates, hatchlings overwinter in the nest.ystematics & taxonomy
Four
subspecies of Common Snapping Turtle are typically recognized: "C. s. serpentina" is the form present across the majority of its range, occurring east of theContinental Divide into most of the southernUnited States , and parts of northern Mexico. "C. s. osceola" occurs only inFlorida up to theOkefenokee area of southern Georgia. "C. s. acutirostris" and "C. s. rossignonii" areneotropical , "C. s. rossignonii" occurring in southern Mexico,Belize ,Guatemala andHonduras while "C s. acutirostris" ranges fromNicaragua across theCentral America nisthmus down the South AmericanPacific coastal region.Evolutionary history
"Chelydra" is an exclusively
New World genus. Its earliest occurrence is from the late Barstovian (middleMiocene ) ofCherry County, Nebraska . This assignment is based on a single partial right hypoplastron that is described as being markedly more massive and rugose than "C. serpentina". No species assignment was made for this specimen. Published reports of "Chelydra" from thePliocene involve very scant material. A large, undescribed fossil member is known from upper Pliocene localities of northernFlorida . Specimens of this new species are by far the largest "Chelydra" ever discovered, reaching acarapace length of over 127 cm (50 inches). Abundant records of "Chelydra" from thePleistocene have been published.Importance to humans
In captivity
It is a common misconception that Common snappers may be safely picked up by its tail, with no harm to the animal; in fact, this has a high chance of injuring the turtle, especially the tail itself and the
vertebra l column.cite web|url=http://blogs.thatpetplace.com/thatreptileblog/2008/06/24/handling-snapping-turtles-chelydra-serpentina-and-other-large-turtles/|title=Handling Snapping Turtles, Chelydra serpentina, and Other Large Turtles|last=Indiviglio|first=Frank|date=2008-06-24|work=That Reptile Blog|publisher=That Pet Place|accessdate=2008-07-20] A handler must also be wary of injury; these turtles are aptly named, as they can snap with amazing speed and power - a large adult snapper can easily bite off a finger or toe. If moving it is absolutely necessary, scooping and lifting the turtle just off the ground with a shovel (especially a snow shovel), if done quickly, may be safest and easiest for all concerned parties.Lifting the turtle with the hands is difficult and dangerous. Some snappers can -- and will -- stretch their necks halfway back across their own carapace to bite. Manual lifting (which should be done only if no other options are available) is best accomplished by sliding fingers behind the turtle's hind legs, with the tail between the hands, and gripping the turtle between the fingers and thumbs. The handler then proceeds to lift the turtle only just off the ground. The turtle will probably squirm and try to dislodge the handler's hands with its hind legs. Even a small snapper is relatively powerful for its size, with long sharp claws; further, due to their aquatic inclinations, these turtles are often slimy and wet, and they are good at causing prospective handlers to lose their grip. In any case that a snapping turtle must be handled, it is best to have the turtle on the ground or very close. Wild turtles may be covered with a smelly pond slime and may also defecate, urinate, or
musk on a handler.In politics
The Common snapper, known commonly and in
folklore as the "Ograbme," was the central feature of a famous Americanpolitical cartoon . Published in1808 in protest at the JeffersonianEmbargo Act of 1807 , the cartoon depicted a snapping turtle, jaws locked fiercely to an American trader who was attempting to carry a barrel of goods onto a British ship. The trader was seen whimsically uttering the words "Oh! this cursed Ograbme" ("embargo " spelled backwards). This piece is widely considered a pioneering work within thegenre of the modern political cartoon.The year
2006 saw the snapping turtle declared the "state reptile" ofNew York by a sweeping vote of theNew York Legislature after being popularly chosen by the state's publicelementary school children.cite news|url=http://www.nytimes.com/2006/06/23/nyregion/23ladybug.html?_r=1&oref=slogin|title=A Few Things Lawmakers Can Agree On |last=Medina|first=Jennifer|date=2006-06-23|work=N.Y./Region|publisher=New York Times|accessdate=2008-07-20]References
Gallery
External links
* [http://www.chelydra.org The Snapping Turtle Page - www.chelydra.org]
* [http://www.metacafe.com/watch/712646/why_theyre_called_snapping_turtles Snapping turtle attempts to bite hiker's camera]
* [http://www.herpnet.net/Iowa-Herpetology/index.php?option=com_content&task=view&id=77&Itemid=26 Snapping Turtle - Chelydra serpentina] Species account from the Iowa Reptile and Amphibian Field Guide
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