Glyptosternon McClelland, 1842,

Alfred W. Thomson & Lawrence M. Page, 2006, Genera of the Asian Catfish Families Sisoridae and Erethistidae (Teleostei: Siluriformes)., Zootaxa 1345, pp. 1-96: 68-69

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Glyptosternon McClelland, 1842


Glyptosternon McClelland, 1842  ZBK 

Fig. 21

Glyptosternon McClelland, 1842  ZBK  : 584. (Type species: Glyptosternon reticulatum McClelland, 1842  ZBK  , by subsequent designation by Bleeker (1862-63: 12).) Gender neuter.

Glyptosternum Agassiz, 1846  : 164. (Type species Glyptosternon reticulatum McClelland, 1842  ZBK  . Unjustified emendation of Glyptosternon McClelland, 1842  ZBK  ). Gender neuter.

Parexostoma Regan, 1905  ZBK  : 182. (Type species: Exostoma stoliczkae Day, 1877  ZBK  , by subsequent designation, apparently by Jordan (1920). Gender neuter. Synonomized with Glyptosternum  (= Glyptosternon  ZBK  ) by Hora (1923b).

Diagnosis: Interrupted post-labial groove; gill openings extending onto venter; homodont dentition; pointed teeth in both jaws; crescent-shaped tooth patch in upper jaw; 10-12 branched pectoral rays.

Glyptosternon  ZBK  is distinguished from all other genera of Glyptosternina  by having gill openings extending onto the venter. Glyptosternon  ZBK  is further distinguished from Oreoglanis  ZBK  , Pseudexostoma  ZBK  , Exostoma  ZBK  , Myersglanis  ZBK  , and Parachiloglanis  ZBK  by having an interrupted post-labial groove (Table 5). It is further distinguished from Glaridoglanis  ZBK  by having small pointed teeth in the upper and lower jaws (vs. strong, distally flattened teeth), and from Pareuchiloglanis  ZBK  by having tooth patches joined into a crescent-shaped band in the upper jaw (vs. tooth patches in the upper jaw joined into a band not produced posteriorly at the sides) and 10-12 (vs. 13-16) branched pectoral-fin rays.

Description: 6-7 dorsal rays; 10-12 branched pectoral-fin rays; 6 pelvic-fin rays; 6-8 anal-fin rays. Head depressed; snout broadly rounded; body elongate, flattened ventrally to pelvic fins. Eyes minute, dorsal, subcutaneous. Lips thick, fleshy, papillated. Post-labial groove broadly interrupted medially. Teeth in both jaws pointed, tooth patches in upper jaw joined, forming a band produced posteriorly at sides (crescent-shaped). Maxillary barbel with well-developed membrane, soft base, and striated pad of adhesive skin. Branchiostegal membranes confluent with isthmus. Coracoid process not externally visible. No thoracic adhesive apparatus. Paired fins plaited to form an adhesive apparatus.

Distribution: Indus drainage; Afghanistan, Pakistan, India, Uzbekistan, Tajikistan and China, east to Irrawaddy drainage, Myanmar (Coad, 1981b; Talwar & Jhingran, 1991; Rafique, 2000)