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''Glyptosternon'' is a
genus Genus ( plural genera ) is a taxonomic rank used in the biological classification of living and fossil organisms as well as viruses. In the hierarchy of biological classification, genus comes above species and below family. In binomial no ...
of sisorid catfishes native to
Asia Asia (, ) is one of the world's most notable geographical regions, which is either considered a continent in its own right or a subcontinent of Eurasia, which shares the continental landmass of Afro-Eurasia with Africa. Asia covers an area ...
.


Species

There are currently four recognized species in this genus: * '' Glyptosternon akhtari''
Silas Silas or Silvanus (; Greek: Σίλας/Σιλουανός; fl. 1st century AD) was a leading member of the Early Christian community, who according to the New Testament accompanied Paul the Apostle on his second missionary journey. Name and e ...
, 1952
* '' Glyptosternon maculatum'' ( Regan, 1905) * '' Glyptosternon reticulatum'' McClelland, 1842 (Turkestan catfish) * '' Glyptosternon oschanini'' Herzenstein, 1889 (Oshanin catfish)


Distribution

species are distributed in
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 Western Tibet, flows northwest through the disputed region of Kashmi ...
drainage in
Afghanistan Afghanistan, officially the Islamic Emirate of Afghanistan,; prs, امارت اسلامی افغانستان is a landlocked country located at the crossroads of Central Asia and South Asia. Referred to as the Heart of Asia, it is border ...
,
Pakistan Pakistan ( ur, ), officially the Islamic Republic of Pakistan ( ur, , label=none), is a country in South Asia. It is the world's fifth-most populous country, with a population of almost 243 million people, and has the world's second-la ...
,
India India, officially the Republic of India ( Hindi: ), is a country in South Asia. It is the seventh-largest country by area, the second-most populous country, and the most populous democracy in the world. Bounded by the Indian Ocean on the ...
(in the state of Jammu and Kashmir),
Uzbekistan Uzbekistan (, ; uz, Ozbekiston, italic=yes / , ; russian: Узбекистан), officially the Republic of Uzbekistan ( uz, Ozbekiston Respublikasi, italic=yes / ; russian: Республика Узбекистан), is a doubly landlocked co ...
,
Tajikistan Tajikistan (, ; tg, Тоҷикистон, Tojikiston; russian: Таджикистан, Tadzhikistan), officially the Republic of Tajikistan ( tg, Ҷумҳурии Тоҷикистон, Jumhurii Tojikiston), is a landlocked country in Cent ...
,
Kyrgyzstan Kyrgyzstan,, pronounced or the Kyrgyz Republic, is a landlocked country in Central Asia. Kyrgyzstan is bordered by Kazakhstan to the north, Uzbekistan to the west, Tajikistan to the south, and the People's Republic of China to the east ...
and western China, east to the Irrawaddy drainage in
Burma Myanmar, ; UK pronunciations: US pronunciations incl. . Note: Wikipedia's IPA conventions require indicating /r/ even in British English although only some British English speakers pronounce r at the end of syllables. As John Wells explai ...
. is from the Bamian River of the Oxus Watershed of the Indus drainage in Afghanistan. is found in the
Brahmaputra The Brahmaputra is a trans-boundary river which flows through Tibet, northeast India, and Bangladesh. It is also known as the Yarlung Tsangpo in Tibetan, the Siang/Dihang River in Arunachali, Luit in Assamese, and Jamuna River in Bangla. ...
drainage of India and China. is from the Indus drainage including Afghanistan, Pakistan, Kashmir, and western China. is known from the Upper Syr Darya and probably Amu Darya in Kyrgyzstan, Uzbekistan and Tajikistan


Description

''Exostoma'' is distinguished by having the combination of an interrupted groove behind the lip (post-labial groove), the
gill A gill () is a respiratory organ that many aquatic organisms use to extract dissolved oxygen from water and to excrete carbon dioxide. The gills of some species, such as hermit crabs, have adapted to allow respiration on land provided they ar ...
openings extending onto the underside (venter),
homodont In anatomy, a heterodont (from Greek, meaning 'different teeth') is an animal which possesses more than a single tooth morphology. In vertebrates, heterodont pertains to animals where teeth are differentiated into different forms. For example, ...
dentition with pointed teeth in both jaws, a
crescent A crescent shape (, ) is a symbol or emblem used to represent the lunar phase in the first quarter (the " sickle moon"), or by extension a symbol representing the Moon itself. In Hinduism, Lord Shiva is often shown wearing a crescent moon ...
-shaped tooth patch in the upper jaw, and 10–12 branched pectoral rays. The head is depressed with a broadly rounded snout. The body is elongate and flattened ventrally to the
pelvic fin Pelvic fins or ventral fins are paired fins located on the ventral surface of fish. The paired pelvic fins are homologous to the hindlimbs of tetrapods. Structure and function Structure In actinopterygians, the pelvic fin consists of two en ...
s. The eyes are minute, dorsally located, and under the skin (subcutaneous). The lips are thick, fleshy, and
papilla Papilla (Latin, ' nipple') or papillae may refer to: In animals * Papilla (fish anatomy), in the mouth of fish * Basilar papilla, a sensory organ of lizards, amphibians and fish * Dental papilla, in a developing tooth * Dermal papillae, part ...
ted. The teeth in both jaws are pointed and the tooth patches in the upper jaw are joined, forming a band produced posteriorly at sides (crescent-shaped). The paired fins are plaited to form an adhesive apparatus. and grow to between . ''Glyptosternon malaisei'' was known only from the type, which is from the Irrawaddy drainage in Burma. A recently published study reidentifies ''G. malaisei'' as a species of ''Glaridoglanis'', on the basis of the spatulate, homodont dentition on both jaws and the premaxillary tooth patch not extending posterolaterally; and considers it to be a junior subjective synonym of '' Glaridoglanis andersonii''.


Ecology

is found in mountain rapids. is found in rivers and streams under stones and rocks. It feeds mainly on
invertebrate Invertebrates are a paraphyletic group of animals that neither possess nor develop a vertebral column (commonly known as a ''backbone'' or ''spine''), derived from the notochord. This is a grouping including all animals apart from the chorda ...
s, especially
insect Insects (from Latin ') are pancrustacean Hexapoda, hexapod invertebrates of the class (biology), class Insecta. They are the largest group within the arthropod phylum. Insects have a chitinous exoskeleton, a three-part body (head, Thorax (ins ...
larva A larva (; plural larvae ) is a distinct juvenile form many animals undergo before metamorphosis into adults. Animals with indirect development such as insects, amphibians, or cnidarians typically have a larval phase of their life cycle. ...
e.


References

{{Taxonbar, from=Q5032516 Sisoridae Fish of Asia Fish of Afghanistan Freshwater fish of China Freshwater fish of India Fish of Myanmar Fish of Pakistan Fish of Central Asia Taxa named by John McClelland (doctor) Freshwater fish genera Catfish genera