The Indian softshell turtle (''Nilssonia gangetica''), or Ganges softshell turtle, is a

species A species () is often defined as the largest group of organisms in which any two individuals of the appropriate sexes or mating types can produce fertile offspring, typically by sexual reproduction. It is the basic unit of Taxonomy (biology), ...

softshell turtle Trionychidae is a family of turtles, commonly known as softshell turtles or simply softshells. The family was described by Leopold Fitzinger in 1826. Softshells include some of the world's largest freshwater turtles, though many can adapt to li ...

found in

South Asia South Asia is the southern Subregion#Asia, subregion of Asia that is defined in both geographical and Ethnicity, ethnic-Culture, cultural terms. South Asia, with a population of 2.04 billion, contains a quarter (25%) of the world's populatio ...

in rivers such as the

Ganges The Ganges ( ; in India: Ganga, ; in Bangladesh: Padma, ). "The Ganges Basin, known in India as the Ganga and in Bangladesh as the Padma, is an international which goes through India, Bangladesh, Nepal and China." is a trans-boundary rive ...

Indus The Indus ( ) is a transboundary river of Asia and a trans- Himalayan river of South and Central Asia. The river rises in mountain springs northeast of Mount Kailash in the Western Tibet region of China, flows northwest through the dis ...

and

Mahanadi The Mahanadi River is a major river in East Central India. It drains an area of around and has a total length of . Mahanadi is also known for the Hirakud Dam which was the first major multipurpose river valley project after India's independenc ...

. This vulnerable turtle reaches a carapace length of up to .Ernst, C.H.; Altenburg, R.G.M.; and Barbour, R.W. (1997).
Aspideretes gangeticus
'', Turtles of the World. Retrieved 17 June 2014. It feeds mostly on fish,

amphibian Amphibians are ectothermic, anamniote, anamniotic, tetrapod, four-limbed vertebrate animals that constitute the class (biology), class Amphibia. In its broadest sense, it is a paraphyletic group encompassing all Tetrapod, tetrapods, but excl ...

s, carrion and other animal matter, but also takes aquatic plants. This turtle is listed in part II of Schedule I of the Wild Life (Protection) Act, 1972 and possession of this species is an offence.

Description

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.

Distribution

This species is often found to occur in the

Padma The Padma () is a major river in Bangladesh. It is the eastern and main distributary of the Ganges, flowing generally southeast for to its confluence with the Meghna River, near the Bay of Bengal. The city of Rajshahi is situated on the bank ...

Meghna The Meghna () is one of the major rivers in Bangladesh, one of the three that form the Ganges Delta, the largest delta on earth, which fans out to the Bay of Bengal. A part of the Surma-Meghna River System, the Meghna is formed inside Bangladesh ...

Brahmaputra The Brahmaputra is a trans-boundary river which flows through Southwestern China, Northeastern India, and Bangladesh. It is known as Brahmaputra or Luit in Assamese, Yarlung Tsangpo in Tibetan, the Siang/Dihang River in Arunachali, and ...

, Jamuna,

Narmada The Narmada River, previously also known as ''Narbada'' or anglicised as ''Nerbudda'', is the 5th longest river in India and overall the longest west-flowing river in the country. It is also the largest flowing river in the state of Madhya Prade ...

and

basins and most of their tributaries and intervening drainages and in the countries of

Afghanistan Afghanistan, officially the Islamic Emirate of Afghanistan, is a landlocked country located at the crossroads of Central Asia and South Asia. It is bordered by Pakistan to the Durand Line, east and south, Iran to the Afghanistan–Iran borde ...

Bangladesh Bangladesh, officially the People's Republic of Bangladesh, is a country in South Asia. It is the List of countries and dependencies by population, eighth-most populous country in the world and among the List of countries and dependencies by ...

India India, officially the Republic of India, is a country in South Asia. It is the List of countries and dependencies by area, seventh-largest country by area; the List of countries by population (United Nations), most populous country since ...

(Assam, Bihar, Gujarat, Jammu & Kashmir, Madhya Pradesh, Orissa, Punjab, Rajasthan, Uttar Pradesh and West Bengal), Southern

Nepal Nepal, officially the Federal Democratic Republic of Nepal, is a landlocked country in South Asia. It is mainly situated in the Himalayas, but also includes parts of the Indo-Gangetic Plain. It borders the Tibet Autonomous Region of China Ch ...

and

Pakistan Pakistan, officially the Islamic Republic of Pakistan, is a country in South Asia. It is the List of countries and dependencies by population, fifth-most populous country, with a population of over 241.5 million, having the Islam by country# ...

In culture

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

Gallery

Image:Aspideretes gangeticus.jpg, Ventral side of ''Nilssonia gangetica'' Image:Trionyx.png, Skull structure of ''Nilssonia gangetica'' Image:TrionyxGangeticaBerjeau.jpg

References

* Anderson,J. 1872 Note on ''Trionyx gangeticus'', and ''Trionyx hurum'', B. Hamilton. Ann. Mag. Nat. Hist. (4) 9: 382–383 * Anderson,J. 1872 On ''Trionyx gangeticus'', Cuvier, ''Trionyx hurum'', B.H. and Dr. Gray. Ann. Mag. Nat. Hist. (4) 10: 219–222 * Cuvier, G.L.C.F.D. 1825 Recherches sur les ossemens fossiles de quadrupèdes, où l'on rétablit les caractères du plusieurs espèces d'animaux que les révolutions du globe paroissent avoir détruites. Dufour & d'Ocagne, Paris. ed. 3, 5 vols. (Parts of this 5 volume edition are cited as appearing from 1821 to 1824; volume 5 appeared in 1825. It consists mostly of articles reprinted from Annales du Muséum d'Histoire Naturelle, Paris. See also Cuvier 1812.) * Webb, R.G. 2004 Trionychid turtle miscellany. Hamadryad 28 (1&2): 119–121

External links

* {{Taxonbar, from=Q262416 Nilssonia (turtle) Reptiles of South Asia Reptiles of India Reptiles described in 1825 Taxa named by Georges Cuvier