Freshwater Turtles

Freshwater Turtles

 

a group of turtles that reproduce on dry land but spend the greater part of their lives in rivers, lakes, and swamps. Freshwater turtles feed mainly on animal substances. Four-fifths of all extant turtles are freshwater species. The 170 species make up 54 genera from nine families. In all, there are three orders: Trionychoidea, Pleurodira, and Cryptodira. The last order includes five families: Chelydridae, Platy-sternidae, Kinosternidae, Dermatemydidae, and Emydidae.

The Emydidae include 25 genera, embracing 77 extant species. They are distributed in Europe, northwestern Africa, North America (Sonora subregion), South America (Guiana-Brazilian subregion), and southern and southeastern Asia. They are especially numerous in Asia. Some species are small, and others are medium-sized. The carapace is streamlined and sometimes brightly colored. The digits are usually webbed, since they are very mobile. Freshwater turtles feed on invertebrates and small vertebrates, especially fish; a small part of their diet consists of plant substances. The eggs, which have a calcareous shell, are buried in pits on the shore. Freshwater turtles usually hibernate in the water, digging into the slime. When they are not in hibernation, they spend their nights in the slime. Some species of Emydidae have secondarily adapted to almost constant life on dry land (for example, the North American box turtle and the turtle Geoemyda trijuga).

A number of Emydidae are commercially valuable for their flesh and eggs. Two species are found in the USSR. The turtle Clemmys caspica inhabits lakes, ditches, and mountain streams in Daghestan, Transcaucasia, and southern Turkmenia. Its carapace, which is immovably joined to the plastron, is 15–20 cm long. The species Emys orbicularis is distributed in middle and southern European USSR, in the Caucasus, and in Kazakhstan (as far as Kzyl-Orda). It inhabits slow-moving and stagnant waters. The oval carapace reaches 25 cm in length and is mova-bly joined to the plastron.

L. I. KHOZATSKII

References in periodicals archive ?
Survey teams found the meat of Indian pangolins, Indian crested porcupines and freshwater turtles on sale in several cities.
According to reports, wildlife inspector Naeem Khan along with the SWD's raiding party, headed by Azeem Burfat, on a tip-off raided the shop, Marine Fish, in Al-Azam Square, Liaquatabad No 10, on Thursday morning and seized 129 freshwater turtles, nine marine green turtles and 13 tortoises, three of them dead.
study was also conducted on the illegal trade in freshwater turtles, the results of which were presented and discussed at a consultative workshop earlier this month.
Others are helmeted hornbills, tortoises and freshwater turtles, sharks and rays, sturgeon and paddlefish.
It is pertinent to mention over here that the hunting of these freshwater turtles and sale is prohibited.
Tortoises and freshwater turtles are the most threatened of any major group of terrestrial vertebrates more so than mammals, birds or amphibians.
A study on microflora in oral and cloacal of freshwater turtles (Emys orbicularis Linnaeus, 1758 and Mauremys rivulata Valenciennes, 1833) from Kavak Delta (Canakkale).
In June 2015, at least 3,900 freshwater turtles were recovered from a warehouse in Bataraza town in Palawan, the biggest haul of wildlife in recent years.
More than 4,000 live freshwater turtles and 90 dead ones were found in a pond inside a remote warehouse on the western island of Palawan four weeks ago in one of the country's biggest wildlife rescues, they said.