Oreoglanis Smith, 1933

Alfred W. Thomson & Lawrence M. Page, 2006, Genera of the Asian Catfish Families Sisoridae and Erethistidae (Teleostei: Siluriformes)., Zootaxa 1345, pp. 1-96 : 72-73

Oreoglanis Smith, 1933

Fig. 23

Oreoglanis Smith, 1933 : 70. (Type species: Oreoglanis siamensis Smith, 1933 , by original designation. Gender masculine.

Paroreoglanis Pellegrin, 1936 : 244. (Type species: Paroreoglanis delacouri Pellegrin, 1936 , by monotypy). Gender masculine. Synonomized with Oreoglanis by Chu (1979).

Diagnosis (based, in part, on Ng & Kottelat 1999): Continuous post-labial groove; gill openings not extending onto venter; homodont dentition in upper jaw; heterodont dentition in lower jaw characterized by inner row of pointed teeth and outer row of short, spatulate (shovel-like) teeth; upper jaw teeth pointed, in two patches, joined into a continuous band; 16-18 branched pectoral rays.

Oreoglanis is distinguished from Glyptosternon , Glaridoglanis , Euchiloglanis , Pareuchiloglanis and Parachiloglanis by having a continuous post-labial groove (Table 5). It is distinguished from Pareuchiloglanis , Glyptosternon , Euchiloglanis , Myersglanis , and Parachiloglanis by having heterodont dentition in the lower jaw characterized by an inner row of pointed teeth and an outer row of short, spatulate (shovel-like) teeth (vs. a single band of conical teeth). Oreoglanis is distinguished from Pseudexostoma by having upper jaw teeth pointed, in two patches, joined into a continuous band (vs. heterodont dentition in two separated patches). It is distinguished from Exostoma by having the upper jaw teeth pointed, in two patches, joined into a continuous band (vs. having oar-shaped, distally flatted teeth in two separated patches), and 16-18 (vs. 10-11) branched pectoral rays.

Description: 6-7 dorsal rays; 16-18 branched pectoral-fin rays; 6 pelvic-fin rays; 4-7 anal-fin rays. Head and body moderately broad, strongly depressed. Skin smooth dorsally. Eyes minute, dorsolateral, and subcutaneous. Lips thin, papillated. Teeth in upper jaw pointed, in large broad band with small median indentation and rounded sides. Maxillary barbel with well-developed membrane, soft base, rounded tip, with striated pad of adhesive skin. Gill openings narrow, not extending below pectoral-fin base. Branchiostegal membranes confluent with isthmus. Coracoid process not externally visible. No thoracic adhesive apparatus. Paired fins plaited to form an adhesive apparatus.

Distribution: Irrawaddy drainage, Mayanmar, east to the Lam River drainage, central Vietnam (Ng & Freyhof, 2001; Ng & Rainboth, 2001).