DERMATEMYS MAWII PDF

Go to: main text of page main navigation local menu. Reproduction oviparous. NW Honduras Pough et al. This is one of the 25 most endangered turtle species according to a assessment by the IUCN. Illustrations of reptiles. Fauna 1 1 : Baur, G.

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The Central American river turtle, Dermatemys mawii , can be found in Central America from southern Mexico as far south as northern and eastern central Guatemala, excluding the Yucatan Peninsula. There have also been sightings of D. As long as there is an abundant food supply, D. Individuals can inhabit just about any freshwater aquatic environment within their range, from deep, clean water bodies to muddy backwaters, oxbows, and temporary seasonal pools.

Primarily, however, they live in large lagoons, lakes and rivers. The presence of barnacles on the shells of some individuals indicates that salty environments do not pose a problem for this species of turtle and may show that D. In adulthood, D. At its largest, this animal can measure up to 65 cm in length and it can weigh approximately 20 kg. The smooth, somewhat flattened carapace, the top portion of the shell, has a uniform olive-gray color and is only slightly domed.

The underside, or plastron, is cream-colored, rounded at the front and serrated at the end. In adults, the carapace lacks a well-defined vertebral ridge running down its center and is smooth and unnotched around the outer edge.

In juveniles of the species, this ridge is present as well as a notched posterior shell end that is somewhat outspread. Additionally, juveniles have a carapace that is browner in color and a keel, which is absent in adults. In addition to being smooth, the shell is quite thick and rather heavy.

The bones that make up the shell can become so tightly fused together in older adults that the sutures, the structures that join the bones of the shell together, become almost invisible, even in dry, bony shells. The head of D. The turtle's slightly upturned nose is large, and shaped like a tube with wide nostrils. It is a rather prominent feature of the turtle's face because it projects rather strongly from the front of the head. The majority of the fleshy parts of the Central American River Turtle are olive gray, the undersides being white or pale gray.

Near its upper surface, the organism is reddish brown to yellow in color while its sides typically remain the olive-gray of the shell. Adult male turtles have a triangular patch covering the whole upper section of the head that is golden yellow in color, as well as yellow markings on each side of the head. Females and turtles that have not yet reached maturity, have dull patches and side markings that are barely visible. Juveniles, however, display a yellow stripe extending backwards from the eye.

The tail of D. It extends past the edge of the back of the carapace in males and just barely to that edge in females. Incredibly thin and almost membrane-like, the turtle's scutes, keratin coverings over the bones that make up the shell, are very sensitive and prone to abbrasions when in contact with hard surfaces.

If, for example, the animal comes in contact with concrete, it will only be a short time before the animal has almost worn itself away to the bone. While the damage that can be done will be repaired to some extent, it will never completely heal and become smooth again, as it once was. Sheets of dead bone will be shed to reveal a pitted, but healed surface. The scute boundaries, like the sutures, become virtually invisible in adults. The legs of D. The feet are fully webbed and broad, each with large scales on the outside edges Dawson ; Ernst and Barbour ; Konstant ; Pritchard Nesting occurs continuously from September to November during the time when the rivers the turtles live in swell considerably due to flooding caused by seasonally increased rainfall.

This phenomenon helps D. Normally, females could not reach these areas by foot but because they are flooded with the excess rainwater, they are easy to swim to. Once females have reached a shallow rivulet, they dig out a nest, lay their eggs, and bury them at the edge of the water under mud and decaying vegetation. Generally, D. Each clutch contains six to twenty eggs that are approximately mm long and mm wide. Because the life of this turtle is so completely aquatic and therefore difficult to study , little else is known about its development and early life Ernst and Barbour ; Pritchard The most aquatic of all turtles, D.

Much of its feeding and other activity goes on at night. It does not bask in the sun on top of logs and river banks as do most turtles. Because it is so well-adapted to its watery home, its limbs cannot support its own body weight, which makes most movements attempted on land very poorly coordinated.

As a result, D. However, its swimming motions underwater are rapid and well-executed. Because of a highly adaptive breathing mechanism, it is only necessary for a Central American River Turtle to surface periodically for air. It sucks water in through its mouth and draws out dissolved oxygen from the water by means of a highly perforated pharyngeal lining just behind the nasal cavity.

The used water is then expelled back through its nostrils. In muddy or cloudy water, the motion of the water moving in the mouth and out the nose is visible. This species of turtle is very passive and has a mild disposition. When handled, it will thrash its tail and limbs around vigorously but rarely bites. The courtship and mating habits of D. However, because members of the opposite sex fight when kept together in captivity, it is thought to be a rather agressive process.

Eggs, hatchlings, and adults of this species are hunted and eaten by humans, crocodiles, raccoons, coati mundis, river otters and a number of wading birds Ernst and Barbour ; Konstant ; Pritchard The Central American River Turtle generally eats plants either submerged below the water or those that rise just above the water's surface.

Typically, these include Russell river grass Paspalum paniculatum , and fallen leaves and fruits from branches growing over the water.

Captured D. Juveniles in captivity tend to more readily accept animal matter as food which may show that young D. The flesh of D. Central American River Turtles eat aquatic plants that are of no use to humans and use them to produce turtle protein for human consumption.

Not only could Central American River Turtles supply a valuable protein source if farmed successfully, they could also supply a valuable source of income for humans living near their habitat Ernst and Barbour Because the meat of D. The hunting problem is exacerbated by the fact that these turtles are easy to catch because of their passive nature.

Legislation has been passed nationally and internationally to help D. While at one time widespread, D. By the Tertiary period, this family had spread into Europe, Africa, and North and Central America but eventually died out to the point that only one species remains. In areas of Belize, D. Animals with bilateral symmetry have dorsal and ventral sides, as well as anterior and posterior ends.

Synapomorphy of the Bilateria. Dawson, J. Ernst, C. Turtles of the World. Washington: Smithsonian Institution Press.

Konstant, W. Poaceae, L. April 7, Pritchard, P. Encyclopedia of Turtles. Neptune, NJ: T. Publications, Inc.. Help us improve the site by taking our survey. To cite this page: Lowry, H.

Disclaimer: The Animal Diversity Web is an educational resource written largely by and for college students. ADW doesn't cover all species in the world, nor does it include all the latest scientific information about organisms we describe. Though we edit our accounts for accuracy, we cannot guarantee all information in those accounts. While ADW staff and contributors provide references to books and websites that we believe are reputable, we cannot necessarily endorse the contents of references beyond our control.

Geographic Range The Central American river turtle, Dermatemys mawii , can be found in Central America from southern Mexico as far south as northern and eastern central Guatemala, excluding the Yucatan Peninsula. Biogeographic Regions neotropical native Habitat As long as there is an abundant food supply, D. Other Physical Features ectothermic bilateral symmetry Range mass 0 to 0 kg 0. Key Behaviors motile Food Habits The Central American River Turtle generally eats plants either submerged below the water or those that rise just above the water's surface.

Economic Importance for Humans: Negative There are no known adverse effects of this species on humans. Conservation Status Because the meat of D. Glossary Neotropical living in the southern part of the New World. In other words, Central and South America. Read more Connect with us Help us improve the site by taking our survey. Facebook Twitter Pinterest. Classification Kingdom Animalia animals Animalia: information 1 Animalia: pictures Animalia: specimens Animalia: sounds Animalia: maps Chordata: information 1 Chordata: pictures Chordata: specimens Chordata: sounds

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The Central American river turtle Dermatemys mawii , also known locally as the hickatee or tortuga blanca white turtle , [8] is the only living species in the family Dermatemydidae. Its closest relatives are only known from fossils with some 19 genera described from a worldwide distribution from the Jurassic and Cretaceous. The specific name , mawii , is in honor of the collector of the type specimen , Lieutenant Mawe of the British Navy. These features are lost as the turtle ages.

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2. Central American River Turtle

The Critically Endangered Central American river turtle is the sole surviving species of an historically widespread family of turtles. However, the entire lineage is now restricted to parts of Belize, southern Mexico and Guatemala. The Central American river turtle diverged from all other living turtles around 80 million years ago. To put this in perspective, this species sits alone on the tip of a branch of the tree of life stretching back to the time of the dinosaurs. The branch of the tree of life upon which humans reside is a mere twig in comparison, stretching back less than 10 million years before we reach our last common ancestor with chimpanzees and bonobos. This large freshwater turtle is highly aquatic and feeds only on plant matter.

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