Exostoma

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Exostoma
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Siluriformes
Family: Sisoridae
Tribe: Glyptosternina
Genus: Exostoma
Blyth, 1860
Type species
Exostoma berdmorei
Blyth, 1860

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]

Contents

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:

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]

Related Research Articles

<span class="mw-page-title-main">Sisoridae</span> Family of fishes

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.

<i>Pseudolaguvia</i> Genus of fishes

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.

<i>Oreoglanis</i> Genus of fishes

Oreoglanis is a genus of fish in the family Sisoridae native to Asia. These fish live in fast-flowing streams in China, mainland Southeast Asia and the Indian subcontinent. They are mainly distributed in the Mekong, upper Salween and Irrawaddy River drainages. They range from the Brahmaputra basin to the Lam River drainage in central Vietnam. They are easily distinguished from other catfishes by their strongly depressed head and body and greatly enlarged paired fins that have been modified to form an adhesive apparatus. The flattened shape of these fish and the large pectoral and pelvic fins provide essential adhesion in the fast-flowing waters they live in.

<i>Glyptothorax</i> Genus of fishes

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.

<i>Batasio</i> Genus of fishes

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.

<i>Erethistes</i> Genus of fishes

Erethistes is a genus of South Asian river catfishes.

<i>Pseudecheneis</i> Genus of fishes

Pseudecheneis is a genus of sisorid catfishes native to Asia.

<i>Bagarius</i> Genus of fishes

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.

<i>Glyptosternon</i> Genus of fishes

Glyptosternon is a genus of sisorid catfishes native to Asia.

<i>Gogangra</i> Genus of fishes

Gogangra is a genus of sisorid catfishes native to Asia.

<i>Gagata</i> Genus of fishes

Gagata is a genus of sisorid catfishes native to Asia.

Pareuchiloglanis is a genus of sisorid catfishes native to Asia. These species are rheophilic catfish chiefly found in the headwaters of major rivers in South and East Asia. They originate from the Brahmaputra drainage in India, east and south to the Yangtze drainage in China and the Annamese Cordillera drainages in southern Vietnam. Two species are known from the Mekong River: P. myzostoma and P. gracilicaudata. Four species are known from the drainage of China: P. abbreviatus, P. gracilicaudata, P. myzostoma and P. prolixdorsalis.

Chimarrichthys kishinouyei is a species of sisorid catfish native to Asia.

Exostoma effrenum is a species of sisorid catfish in the family Sisoridae. It is found in Thailand.

Exostoma peregrinator is a species of sisorid catfish in the family Sisoridae. It is found in Thailand.

Exostoma stuarti is a species of sisorid catfish in the family Sisoridae. It is found in Myanmar.

Exostoma tenuicaudata is a species of sisorid catfish in the family Sisoridae. It is found in the Siang River, in the Brahmaputra River basin in Arunachal Pradesh, India.

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 nubila is a species of catfish in the family Erethistidae. It is found in the Kaladan River drainage system in southern Mizoram, India.

References

  1. 1 2 3 4 5 6 Thomson, A.W.; Page, L.M. (2006). "Genera of the Asian Catfish Families Sisoridae and Erethistidae (Teleostei: Siluriformes)" (PDF). Zootaxa . 1345: 1–96.
  2. 1 2 3 Froese, Rainer; Pauly, Daniel (eds.) (2015). "Exostoma labiatum" in FishBase . October 2015 version.
  3. 1 2 Froese, Rainer; Pauly, Daniel (eds.) (2015). "Exostoma stuarti" in FishBase . October 2015 version.
  4. ↑ Ferraris, C.J. Jr (2007). "Checklist of catfishes, recent and fossil (Osteichthyes: Siluriformes), and catalogue of siluriform primary types" (PDF). Zootaxa . 1418: 1–628.
  5. 1 2 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.
  6. ↑ Arunkumar L. Exostoma laticaudata, a new glyptosternine catfish (Teleostei: Sisoridae) from Manipur, Northeastern India. Species, 2020, 21(68), 293-305
  7. ↑ 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.
  8. ↑ 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.
  9. ↑ Froese, Rainer; Pauly, Daniel (eds.) (2015). "Exostoma berdmorei" in FishBase . October 2015 version.
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