The red-crowned roofed turtle or Bengal roof turtle (''Batagur kachuga'') 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), ...

of freshwater

turtle Turtles are reptiles of the order (biology), order Testudines, characterized by a special turtle shell, shell developed mainly from their ribs. Modern turtles are divided into two major groups, the Pleurodira (side necked turtles) and Crypt ...

endemic Endemism is the state of a species being found only in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also foun ...

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 ...

. It was the

type species In International_Code_of_Zoological_Nomenclature, zoological nomenclature, a type species (''species typica'') is the species name with which the name of a genus or subgenus is considered to be permanently taxonomically associated, i.e., the spe ...

of its former

genus Genus (; : genera ) is a taxonomic rank above species and below family (taxonomy), family as used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In bino ...

''Kachuga''. Females can grow to a shell length of and weigh , but males are considerably smaller. The turtles like to bask in the sun on land. In the breeding season, the heads and necks of male turtles exhibit bright red, yellow and blue coloration. The females excavate nests in which they lay clutches of up to thirty eggs. Historically, this turtle was found in central Nepal, northeastern India, Bangladesh and probably Burma (Myanmar), but it has suffered declines in population due to being harvested for meat and shells, drowned in fishing nets, water pollution, hydro-electric schemes and habitat loss. Fewer than four hundred adult females are thought to remain in the wild, with the

International Union for Conservation of Nature The International Union for Conservation of Nature (IUCN) is an international organization working in the field of nature conservation and sustainable use of natural resources. Founded in 1948, IUCN has become the global authority on the stat ...

rating this turtle as being "

critically endangered An IUCN Red List critically endangered (CR or sometimes CE) species is one that has been categorized by the International Union for Conservation of Nature as facing an extremely high risk of extinction in the wild. As of December 2023, of t ...

". India has put conservation measures in place, and a captive breeding programme has been initiated.

Description

It can weigh up to and have shells as long as . Males reach only half the length of females. At the end of the rainy season, the heads and necks of male turtles develop a brilliant courtship coloration of red, yellow, white, and blue, with 6 distinctive bright red stripes on top of the head. The

carapace A carapace is a dorsal (upper) section of the exoskeleton or shell in a number of animal groups, including arthropods, such as crustaceans and arachnids, as well as vertebrates, such as turtles and tortoises. In turtles and tortoises, the unde ...

of the young is strongly keeled. The

keel The keel is the bottom-most longitudinal structural element of a watercraft, important for stability. On some sailboats, it may have a fluid dynamics, hydrodynamic and counterbalancing purpose as well. The keel laying, laying of the keel is often ...

s are tubercular posteriorly on the second and third vertebral shields. The posterior margin is strongly crenulated. The marginal serrature disappears in adolescent specimens and the vertebral keel, after being reduced to a series of low knobs, vanishes entirely in the full-grown, the carapace of which is very convex. The

nuchal The nape is the back of the neck. In technical anatomical/medical terminology, the nape is also called the nucha (from the Medieval Latin rendering of the Arabic , ). The corresponding adjective is ''nuchal'', as in the term ''nuchal rigidity' ...

shield is small, trapezoidal and broadest posteriorly. The first

vertebral Each vertebra (: vertebrae) is an irregular bone with a complex structure composed of bone and some hyaline cartilage, that make up the vertebral column or spine, of vertebrates. The proportions of the vertebrae differ according to their spina ...

is as broad or broader in front as behind. The second vertebral is longer than the third, with which it forms a straight transverse suture. The fourth is longest and forms a broad suture with the third. The second vertebral is broader than long in the young, and as long as broad in the adult.

Plastron The turtle shell is a shield for the ventral and dorsal parts of turtles (the Order (biology), order Testudines), completely enclosing all the turtle's vital organs and in some cases even the head. It is constructed of modified bony elements such ...

is angulate laterally in the young. The anterior and posterior lobes are rather narrow and shorter than the width of the bridge, truncate anteriorly and are openly notched posteriorly. The longest median suture is between the abdominals and the shortest is between the gulars, which equals about one half that between the humerals. The suture between gulars and humerals forms an

obtuse angle In Euclidean geometry, an angle can refer to a number of concepts relating to the intersection of two straight lines at a point. Formally, an angle is a figure lying in a plane formed by two rays, called the '' sides'' of the angle, sharing ...

, as does that between humerals and pectorals. The inguinal is large and the

axilla The axilla (: axillae or axillas; also known as the armpit, underarm or oxter) is the area on the human body directly under the shoulder joint. It includes the axillary space, an anatomical space within the shoulder girdle between the arm a ...

ry is smaller. The head is moderate size with an obtuse and moderately prominent

snout A snout is the protruding portion of an animal's face, consisting of its nose, mouth, and jaw. In many animals, the structure is called a muzzle, Rostrum (anatomy), rostrum, beak or proboscis. The wet furless surface around the nostrils of the n ...

. The jaws have denticulated edges with the upper not notched mesially.

Alveolar Alveolus (; pl. alveoli, adj. alveolar) is a general anatomical term for a concave cavity or pit. Uses in anatomy and zoology * Pulmonary alveolus, an air sac in the lungs ** Alveolar cell or pneumocyte ** Alveolar duct ** Alveolar macrophage * M ...

surfaces are very broad, the median ridge of the upper jaw being somewhat nearer the outer than the inner margin.

Choanae The choanae (: choana), posterior nasal apertures or internal nostrils are two openings found at the back of the nasal passage between the nasal cavity and the pharynx, in humans and other mammals (as well as crocodilians and most skinks). They ...

are behind the line of the posterior borders of the

orbits In celestial mechanics, an orbit (also known as orbital revolution) is the curved trajectory of an physical body, object such as the trajectory of a planet around a star, or of a natural satellite around a planet, or of an satellite, artificia ...

. The width of the lower jaw at the

symphysis A symphysis (, : symphyses) is a fibrocartilaginous fusion between two bones. It is a type of cartilaginous joint, specifically a secondary cartilaginous joint. # A symphysis is an amphiarthrosis, a slightly movable joint. # A growing together o ...

equals the diameter of the orbit. The limbs have transversely enlarged, band-like

scales Scale or scales may refer to: Mathematics * Scale (descriptive set theory), an object defined on a set of points * Scale (ratio), the ratio of a linear dimension of a model to the corresponding dimension of the original * Scale factor, a number ...

which are colored brown above and yellowish below. The

nape The nape is the back of the neck. In technical anatomical/medical terminology, the nape is also called the nucha (from the Medieval Latin rendering of the Arabic , ). The corresponding adjective is ''nuchal'', as in the term ''nuchal rigidity'' ...

has red longitudinal lines.

Geographic range

This reptile was historically widespread in Central

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 ...

, NE

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 ...

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 ...

, primarily in deep flowing freshwater rivers with terrestrial nest sites in the watershed of the

Ganges River 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 ...

and probably NW

Burma Myanmar, officially the Republic of the Union of Myanmar; and also referred to as Burma (the official English name until 1989), is a country in northwest Southeast Asia. It is the largest country by area in Mainland Southeast Asia and ha ...

. Type locality: "India"; restricted by M.A. Smith 1931:131, to "N. India." The

National Chambal Sanctuary National Chambal Sanctuary, also called the National Chambal Gharial Wildlife Sanctuary, is a tri-state protected area in northern India for the protection of the Critically Endangered gharial, the red-crowned roof turtle and the Endangered G ...

portion of the

Chambal River The Chambal River is a tributary of the Yamuna River in Central India, Central and North India, Northern India, and thus forms part of the drainage system of the Ganges. The river flows north-northeast through Madhya Pradesh, running for a brie ...

has received moderate protection since 1979 as India's only protected

riverine A river is a natural stream of fresh water that flows on land or inside caves towards another body of water at a lower elevation, such as an ocean, lake, or another river. A river may run dry before reaching the end of its course if it run ...

habitat. It is believed to be one of the last viable habitats for this species, though even here, ''B. kachuga'' are rare. Recent annual nesting surveys indicate fewer than 400 adult females remaining in the wild.

Diet

The diet of red-crowned roofed turtles consists entirely of aquatic plants. Das, I. 2002. ''A Photographic Guide to Snakes and Other Reptiles of India''. Ralph Curtis Books. Sanibel Island, Florida. 144 pp. . ("Painted Roofed Turtle ''Kachuga kachuga''", p. 127.)

Behavior

They leave the water to thermoregulate by basking in the sun on rocks, logs, and sandbanks.

Reproduction

Adult females lay eggs in March and April. The eggs are long by wide. Clutch size varies from 11 to 30 eggs.

Threats

The large ''Batagur'' turtles are probably the most threatened freshwater turtles in India. Their populations have now been drastically reduced due to

poaching Poaching is the illegal hunting or capturing of wild animals, usually associated with land use rights. Poaching was once performed by impoverished peasants for subsistence purposes and to supplement meager diets. It was set against the huntin ...

for their meat and shells, accidental drowning in fishing gear,

water pollution Water pollution (or aquatic pollution) is the contamination of Body of water, water bodies, with a negative impact on their uses. It is usually a result of human activities. Water bodies include lakes, rivers, oceans, aquifers, reservoirs and ...

hydroelectric Hydroelectricity, or hydroelectric power, is Electricity generation, electricity generated from hydropower (water power). Hydropower supplies 15% of the world's electricity, almost 4,210 TWh in 2023, which is more than all other Renewable energ ...

infrastructure projects, habitat destruction by

sand mining Sand mining is the extraction of sand, mainly through an open pit (or sand pit) but sometimes mined from beaches and inland dunes or dredged from ocean and river beds. Sand is often used in manufacturing, for example as an abrasive or in conc ...

, and egg

predation Predation is a biological interaction in which one organism, the predator, kills and eats another organism, its prey. It is one of a family of common List of feeding behaviours, feeding behaviours that includes parasitism and micropredation ...

jackals Jackals are canids native to Africa and Eurasia. While the word has historically been used for many canines of the subtribe canina, in modern use it most commonly refers to three species: the closely related black-backed jackal (''Lupulella ...

Conservation

Since 2004, ''B. kachuga'' has reproduced in captivity at the

Madras Crocodile Bank Trust The Madras Crocodile Bank Trust and Centre for Herpetology (MCBT) is a reptile zoo and herpetology research station, located south of the city of Chennai, Tamil Nadu, India. The centre is both a registered trust and a recognized zoo under the ...

. A total of 132 eggs were laid through 2009 with an overall viability of 69%. 75 hatchlings were produced from these eggs, with 24 young turtles sent to

Uttar Pradesh Uttar Pradesh ( ; UP) is a States and union territories of India, state in North India, northern India. With over 241 million inhabitants, it is the List of states and union territories of India by population, most populated state in In ...

for release in 2007. Since 2006, the Chambal River Sanctuary Program of Turtle Survival Alliance- India has implemented projects to protect wild nests, collect and hatch wild eggs in hatchery conditions, raise hatchlings to at about 4 years age, conduct survival and migration studies of tagged and released hatchlings and conduct surveys over of river to determine nesting locations, nesting density, nest depredation rates, and

anthropogenic Anthropogenic ("human" + "generating") is an adjective that may refer to: * Anthropogeny, the study of the origins of humanity Anthropogenic may also refer to things that have been generated by humans, as follows: * Human impact on the enviro ...

pressures on the turtles.

References

* Safi, A., Khan, M. Z., 2014. Distribution and current population of freshwater turtles of District Charsadda of Khyber Pakhtunkhwa, Pakistan. The Journal of Zoology studies. 1(4): 31–38. http://www.journalofzoology.com * Moll, E.O. 1986. Survey of the freshwater turtles of India. The genus ''Kachuga''. parts J. Bombay Nat. Hist. Soc. 83 (3): 538–552. * Gray, J.E. 1831. Illustrations of Indian Zoology: chiefly selected from the collection of Major General Hardwicke. Vol. 1, London (1830–1835). * Gray, J.E. 1862. Notice of two new species of Batagur in the collection of the British Museum. Proc. Zool. Soc. London 1862:264-265. * Gray, J.E. 1863. Notice of two new species of Batagur in the collection of the British Museum. Ann. Mag. Nat. Hist. (3) 12: 74–75.

External links

* * http://itgmv1.fzk.de/www/itg/uetz/herp/photos/Kachuga_kachuga.jpg * http://itgmv1.fzk.de/www/itg/uetz/herp/photos/Kachuga_kachuga_female.jpg {{Taxonbar, from=Q306355 Reptiles of India Reptiles described in 1831 Taxa named by John Edward Gray Batagur