| Sisor | |
|---|---|
 | |
| Sisor rabdophorus | |
Scientific classification  | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Actinopterygii |
| Order: | Siluriformes |
| Family: | Sisoridae |
| Subfamily: | Sisorinae |
| Genus: | Sisor Hamilton, 1822 |
| Type species | |
| Sisor rabdophorus Hamilton, 1822 | |
Sisor was previously monotypic, containing only S. rabdophorus, prior to a review of the genus in 2003 in which the three species S. chennuah, S. rheophilus, and S. torosus were described. [1] S. barakensis was described in 2005. [2]
S. rabdophorus is sometimes spelled S. rhabdophorus; this is meant to correct the misspelling of the Greek word rhabdos meaning rod. However, this is not a valid emendation. [1]
There are currently six recognized species in this genus: [3] [4]
Sisor species are distributed in the Ganges and Brahmaputra drainages in India. S. barakensis originates from the Barak River of the Brahmaputra drainage in India. [2] S. chennuah inhabits the Brahmaputra drainage in Assam State, India. S. rabdophorus originates from the Ganges drainage, West Bengal States, India. S. rheophilus originates from the Ganges drainage, Bihar and Uttar Pradesh States, India. S. torosus lives in the Ganges drainage, Bihar and Delhi States, India. [1] The identities of Sisor specimens from the Indus River, Rohini River at Madhopur, and Nepal have not yet been confirmed. [1]
S. rheophilus has been found in fast-moving rivers with sandy bottoms. [1] S. rabdophorus also inhabits streams with sandy bottoms and strong currents. [5]
Sisor is distinguished from all other erethistids and sisorids by the presence of a series of bony plates extending from the dorsal fin to the base of the caudal fin and a spine in adipose fin. Also, the uppermost caudal-fin ray is more than half length of body, the branchiostegal membranes are broadly fused to isthmus, the outer and inner mental barbels are widely separated with the origin of outer barbels anterior to origin of inner barbels, the lower jaw teeth are minute, dentition essentially consisting of roughened plate, large serrations on the anterior margin of the pectoral spine (also serrated posteriorly), a well-developed maxillary barbel membrane, and palatal teeth absent. [2] The head is moderately narrow and strongly depressed. The body is extremely narrow and strongly depressed. The eyes are small, dorsolaterally located, and under the skin (subcutaneous). The maxillary barbels do not extend beyond the head. The dorsal fin spine is serrate anteriorly and smooth posteriorly. [2]
S. chennua, S. rheophilus, and S. torosus grow to about 9.5–11.6 centimetres (3.7–4.6 inches) SL. [6] [7] [8] S. rabdophorus attains a length of about 18.0 cm (7.1 in) SL. [5]
Sisoridae is a family of catfishes. These Asian catfishes live in fast-moving waters and often have adaptations that allow them to adhere to objects in their habitats. The family includes about 235 species.
Erethistidae are a family of catfishes that originate from southern Asia. It includes about 45 species.
Pseudolaguvia is a genus of South Asian river catfishes. These species inhabit hill streams and large rivers. P. tenebricosa is found in fast running, clear water; the river has a sandy bottom and numerous rocks and boulders and aquatic vegetation is absent. P. inornata is from clear, shallow, moderately flowing streams with a predominantly sandy bottom. P. muricata is found in clear, shallow, slow-flowing streams with a mixed substrate of sand and detritus; these fish are found amongst detritus in areas with current. P. ferula is also found in swift flowing waters with a mixed rocky/sandy bottom.
Glyptothorax is a genus of catfishes order Siluriformes of the family Sisoridae. It is the most species-rich and widely distributed genus in the family with new species being discovered on a regular basis. These species are distributed in the Black Sea basin, northern Turkey, south and east to the Yangtze River drainage in China and south throughout Indo-China to Java, Indonesia. They are found in Asia Minor and southwards to Southeast Asia. The genus is very diverse in the Indian subcontinent. Southeast Asian species tend to have restricted distributions.
Myersglanis is a genus of sisorid catfishes native to Asia.
Batasio is a genus of catfish of the family Bagridae. These small fish are found in fast-flowing hillstreams throughout South and mainland Southeast Asia.
Parachiloglanis hodgarti, the torrent catfish, is a species of catfish of the family Sisoridae.
Erethistoides is a genus of South Asian river catfishes.
Erethistes is a genus of South Asian river catfishes.
Pseudecheneis is a genus of sisorid catfishes native to Asia.
Bagarius is an Asian genus of catfishes of the family Sisoridae. It includes five to six extant species and potentially one extinct fossil species, B. gigas.
Exostoma is a genus of sisorid catfishes native to Asia. These species are distributed in the Brahmaputra drainage of north-eastern India, and east and south to the Salween drainages in Burma. E. berdmorei is found in the Sittang and Salween drainages in Burma. E. labiatum is known from the Brahmaputra drainage in north-eastern India, but has also been recorded in the Salween drainage in Burma, the Ayeyarwady drainage in China, and the Brahmaputra drainage in Tibet and Burma. E. stuarti is from the Ayeyarwady River of Burma and India; however, it has not been collected since its original discovery. E. labiatum is found in mountain rapids.
Glyptosternon is a genus of sisorid catfishes native to Asia.
Gogangra is a genus of sisorid catfishes native to Asia.
Gagata is a genus of sisorid catfishes native to Asia.
Nangra is a genus of sisorid catfishes native to Asia.
Exostoma sawmteai is a species of sisorid catfish in the family Sisoridae. It is found in the Pharsih River, which is a tributary of the Tuivai River in the Barak River drainage in Mizoram, north-eastern India.
Exostoma barakense is a species of sisorid catfish in the family Sisoridae. It is found in India.
Pseudolaguvia virgulata is a species of catfish in the family Erethistidae. It is found in the Barak River drainage in Mizoram, India.
Pseudolaguvia nubila is a species of catfish in the family Erethistidae. It is found in the Kaladan River drainage system in southern Mizoram, India.