Indian softshell turtle

Indian softshell turtle
Immature (the dark eyespots on the carapace are indistinct or absent in adults)
Conservation status
Vulnerable (IUCN 2.3)
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Reptilia
Order:	Testudines
Suborder:	Cryptodira
Family:	Trionychidae
Genus:	Nilssonia
Species:	N. gangetica
Binomial name
Nilssonia gangetica (Cuvier, 1825)
Synonyms
Trionyx gangeticus Cuvier, 1825 Trionyx javanicus Gray, 1831 Testudo gotaghol Buchanan-Hamilton, 1831 (nomen nudum) Aspidonectes gangeticus Wagler, 1833 Gymnopus duvaucelii Duméril & Bibron, 1835 Tyrse gangetica Gray, 1844 Trionyx gangetiga Gray, 1873 (ex errore) Isola gangetica Baur, 1893 Aspideretes gangeticus Hay, 1904 Trionyx gangeticus mahanaddicus Annandale, 1912 Gymnopus duvaucelli Smith, 1931 Amyda gangetica Mertens, Müller & Rust, 1934 Trionix gangeticus Richard, 1999

The Indian softshell turtle (Nilssonia gangetica), or Ganges softshell turtle is a species of softshell turtle found in South Asia in rivers such as the Ganges, Indus and Mahanadi. This vulnerable turtle reaches a carapace length of up to 94 cm (37 in). It feeds mostly on fish, amphibians, carrion and other animal matter, but also takes aquatic plants.

The species is identified on the basis of the structure of the carapace and plastron. There are eight pairs of costal plates, the last well developed and in contact throughout on the median line; two neurals between the first pair of costals; plates coarsely pitted and vermiculate. Epiplastra narrowly separated from each other in front of the ontoplastron, which forms an obtuse or a right angle; plastral callosities very large, hyo-hypoplastral, xiphiplastral, and, in old specimens, ento-plastral. Dorsal skin of young with longitudinal ridges of small tubercles. Head moderate; snout (on the skull) about as long as the diameter of the orbit; interorbital region, in the adult, considerably narrower than the nasal fossa; postorbital arch one third to one half the greatest diameter of the orbit; mandible with the inner edge strongly raised, forming a sharp ridge, which sends off a short perpendicular process at the symphysis; the diameter of the mandible at the symphysis does not exceed the diameter of the orbit. Olive above; back of young vermiculated with fine black lines, but without ocelli; head with a black longitudinal streak from between the eyes to the nape, intersected by two or three inverted-V shaped black streaks; lower parts yellowish. Length of dorsal disk 2 feet.

These turtles are often maintained in the temple ponds of Orissa where they are considered sacred.

Ventral side of Nilssonia gangetica

Skull structure of Nilssonia gangetica

...
Wikipedia