Superregnum: Eukaryota
Cladus: Unikonta
Cladus: Opisthokonta
Cladus: Holozoa
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Superphylum: Deuterostomia
Phylum: Chordata
Subphylum: Vertebrata
Infraphylum: Gnathostomata
Megaclassis: Osteichthyes
Superclassis/Classis: Actinopterygii
Classis/Subclassis: Actinopteri
Subclassis/Infraclassis: Neopterygii
Infraclassis: Teleostei
Megacohors: Osteoglossocephalai
Supercohors: Clupeocephala
Cohors: Otomorpha
Subcohors: Ostariophysi
Sectio: Otophysa
Ordo: Siluriformes
Familia: Sisoridae
Subfamilia: Glyptosterninae
Tribus: Glyptosternini
Genusː Exostoma
Species: E. berdmorei – E. effrenum – E. ericinum – E. kottelati – E. labiatum – E. mangdechhuensis – E. peregrinator – E. sawmteai – E. tenuicaudata – E. tibetanum
Name
Exostoma Blyth, 1860
Type species: Exostoma berdmorei Blyth, 1860
References
Blyth, E. 1860. Report on some fishes received chiefly from the Sitang River and its tributary streams, Tenasserim Provinces. Journal of the asiatic Society of Bengal 29(2): 138–174. (PDF)Reference page.
Darshan, A., Vishwanath, W., Abujam, S. & Das, D.N. 2019. Exostoma kottelati, a new species of catfish (Teleostei: Sisoridae) from Arunachal Pradesh, India. Zootaxa 4585(2): 369–377. DOI: 10.11646/zootaxa.4585.2.10 Paywall Reference page.
Ferraris, C.J., jr. 2007. Checklist of catfishes, recent and fossil (Osteichthyes: Siluriformes), and catalogue of siluriform primary types. Zootaxa 1418: 1–628. Abstract & excerpt PDF (part 1) PDF (part 2) Reference page.
Ng, H.H. & Vidthayanon, C. 2014. A review of the glyptosternine catfish genus Exostoma Blyth 1860 from Thailand, with descriptions of two new species (Teleostei: Siluriformes). Zootaxa 3869(4): 420–434. DOI: 10.11646/zootaxa.3869.4.6 Reference page.
Ng, H.H. 2018. Exostoma ericinum, a new glyptosternine catfish from southwestern China (Teleostei: Siluriformes: Sisoridae). Zootaxa 4420(3): 405–414. DOI: 10.11646/zootaxa.4420.3.6 Paywall Reference page.
Thoni, R.J. & Gurung, D.B. 2018. Morphological and molecular study of the torrent catfishes (Sisoridae: Glyptosterninae) of Bhutan including the description of five new species. Pp 40–68 In Page, L.M., Chen, W-J. & Ciccotto, P.J. (eds.) Papers on fishes of Asia, including those presented at international conferences of the Asian Society of Ichthyologists in Taipei, Taiwan in 2016, and in Ho Chi Minh City, Vietnam in 2017. Zootaxa 4476(1): 1–181. DOI: 10.11646/zootaxa.4476.1.1 Reference page. . DOI: 10.11646/zootaxa.4476.1.5 Paywall full article pdf Reference page.
Vishwanath W. & Joyshree H., 2007. A new sisorid catfish of the genus Exostoma Blyth from Manipur, India. Zoos' Print Journal 22 (1): 2531–2534. Full article: [1]
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.[1] 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.[1][2] E. stuarti is from the Ayeyarwady River of Burma and India; however, it has not been collected since its original discovery.[1][3] E. labiatum is found in mountain rapids.[2]
In a 2007 checklist of sisorid and erethistid catfishes, Thomson lists E. stuarti and E. vinciguerrae as valid species.[1] In a 2007 checklist of catfishes, Ferraris lists these two species as species inquerendae, noting that these species are either treated as valid or as synonyms of E. labiatum.[4]
Species
The following species are currently recognized in the genus Exostoma:
Exostoma barakense Vishwanath & Joyshree, 2007
Exostoma berdmorei Blyth, 1860
Exostoma effrenum H. H. Ng & Vidthayanon, 2014[5]
Exostoma gaoligongense Chen, Poly, Catania & Jiang, 2017 (Gaoligong mountain catfish)
Exostoma labiatum (McClelland, 1842) (Burmese Bat Catfish)
Exostoma laticaudata Arunkumar, 2020[6]
Exostoma peregrinator H. H. Ng & Vidthayanon, 2014[5]
Exostoma sawmteai Lalramliana, Lalronunga, Lalnuntluanga & H. H. Ng, 2015[7]
Exostoma stuarti (Hora, 1923)
Exostoma tenuicaudata Tamang, Sinha & Gurumayum, 2015[8]
Exostoma vinciguerrae Regan, 1905
Description
Exostoma is distinguished by having a continuous groove behind the lips (post-labial groove), the gill openings not extending onto the underside (venter), homodont dentition of oar-shaped, distally flattened teeth in both jaws, the tooth patches separated in upper jaw, and 10–11 branched pectoral rays.[1] The head is depressed with a broadly rounded snout. The body is elongate and flattened ventrally to the pelvic fins. The eyes are minute, dorsally located, and under the skin (subcutaneous). The lips are thick, fleshy, and papillated. The teeth are small to large, moveable, oar-shaped, flattened distally and directed posteriorly in distinct patches.[1]
E. stuarti is recorded to grow to 5.6 centimetres (2.2 in) SL.[3] E. berdmorei and E. labiatum grow to about 10–11 cm (3.94–4.33 in) TL.[9][2]
References
Thomson, A.W.; Page, L.M. (2006). "Genera of the Asian Catfish Families Sisoridae and Erethistidae (Teleostei: Siluriformes)" (PDF). Zootaxa. 1345: 1–96. doi:10.11646/zootaxa.1345.1.1.
Froese, Rainer; Pauly, Daniel (eds.). "Exostoma labiatum". FishBase. October 2015 version.
Froese, Rainer; Pauly, Daniel (eds.). "Exostoma stuarti". FishBase. October 2015 version.
Ferraris, C.J. Jr (2007). "Checklist of catfishes, recent and fossil (Osteichthyes: Siluriformes), and catalogue of siluriform primary types" (PDF). Zootaxa. 1418: 1–628. doi:10.11646/zootaxa.1418.1.1.
Ng, H.H. & Vidthayanon, C. (2014): A review of the glyptosternine catfish genus Exostoma Blyth 1860 from Thailand, with descriptions of two new species (Teleostei: Siluriformes). Zootaxa, 3869 (4): 420–434.
Arunkumar L. Exostoma laticaudata, a new glyptosternine catfish (Teleostei: Sisoridae) from Manipur, Northeastern India. Species, 2020, 21(68), 293-305
Lalramliana, Lalronunga, S., Lalnuntluanga & Ng, H.H. (2015): Exostoma sawmteai, a new sisorid catfish from northeast India (Teleostei: Sisoridae). Ichthyological Exploration of Freshwaters, 26 (1): 59-64.
Tamang, L., Sinha, B. & Gurumayum, S.D. (2015): Exostoma tenuicaudata, a new species of glyptosternine catfish (Siluriformes: Sisoridae) from the upper Brahmaputra drainage, northeastern India. Zootaxa, 4048 (3): 441–445.
Froese, Rainer; Pauly, Daniel (eds.). "Exostoma berdmorei". FishBase. October 2015 version.
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