Genera of the Asian Catfish Families Sisoridae and Erethistidae (Teleostei: Siluriformes). Author Alfred W. Thomson Author Lawrence M. Page text Zootaxa 2006 1345 1 96 http://www.zoobank.org/urn:lsid:zoobank.org:pub:25EFA792-7DA4-4E0D-A69A-12591B8422DE journal article z01345p001 25EFA792-7DA4-4E0D-A69A-12591B8422DE Euchiloglanis Regan, 1907 Fig. 18 Chimarrichthys Sauvage, 1874 : 332. (Types species: Chimarrichthys davidi Sauvage, 1874 , by monotypy). Gender masculine. Euchiloglanis Regan, 1907 : 158. (Types species: Chimarrichthys davidi Sauvage, 1874 , by being a replacement name. Proposed as a replacement for Chimarrichthys Sauvage, 1874 , then considered to be preoccupied by Cheimarrichthys Haast, 1874 in fishes). Gender masculine. Coraglanis Hora & Silas, 1952b : 12. (Type species: Euchiloglanis kishinouyei Kimura, 1934 , by original designation). Gender masculine. Synonomized with Euchiloglanis by Chu (1981). Diagnosis (based, in part, on Chu 1981): Interrupted post-labial groove; gill openings not extending onto venter; homodont dentition; pointed teeth in both jaws; tooth patches in upper jaw joined into cresent-shaped band; 12-14 branched pectoral rays. Euchiloglanis is distinguished from Oreoglanis , Pseudexostoma , Exostoma , Myersglanis , and Parachiloglanis by having an interrupted post-labial groove (Table 5). Euchiloglanis is distinguished from Pareuchiloglanis by having a crescent-shaped tooth patch in the upper jaw. i.e., a band that curves posteriorly at the sides (vs. not curved posteriorly). It is distinguished from Glyptosternon by having the gill openings not extending onto the venter, and from Glaridoglanis by having small pointed teeth in both jaws (vs. strong, distally flattened teeth). Description: Dorsal fin with 7 rays; pectoral fin with 12-14 branched rays; 6 pelvicfin rays; 6 anal-fin rays. Head depressed; snout broadly rounded; body elongate, flattened ventrally to pelvic fins. Eyes small, dorsal, subcutaneous. Lips thick, fleshy, papillated. Post-labial groove broadly interrupted at middle. Upper jaw teeth pointed, tooth patches in upper jaw joined into cresent-shaped band. Maxillary barbel with well-developed membrane, soft base, 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: Yangtze drainage, China (Chu, 1981; He, 1995; Fu et. al., 2003). FIGURE 18. Euchiloglanis davidi . Drawn by J. Bourque, after Chu et al. (1999). TABLE 5. Development of the post-labial groove on the lower jaw in genera of Glyptosternina .
Post-labial groove on lower jaw Genera
Absent; lower lip contiguous with isthmus without demarcation (Fig. 17a) Parachiloglanis
Interrupted (Fig. 17b) Glyptosternon Euchiloglanis Glaridoglanis Pareuchiloglanis
Continuous (Fig. 17c) Myersglanis Oreoglanis Exostoma Pseudexostoma
TABLE 6. External traits diagnostic for genera of Glyptosternina with an interrupted post-labial groove on the lower jaw.
Glyptosternon Euchiloglanis Glaridoglanis Pareuchiloglanis
Gill openings extend onto venter Yes No; not extending below pectoral fin base No; not extending below pectoral fin base No; not extending below pectoral fin base
Teeth in upper and lower jaws Homodont; small, pointed Homodont; small, pointed Homodont: strong, distally flattened Homodont; small, pointed
Tooth patches in upper jaw Joined, forming a crescent-shaped band Joined, forming a crescent-shaped band Joined, forming a slightly crescentshaped band Joined, not produced posteriorly at sides
Branched pectoral fin rays 10-12 12-14 10-11 13-16
TABLE 7. External traits diagnostic for genera of Glyptosternina with a continuous post-labial groove on the lower jaw.
Myersglanis Oreoglanis Exostoma Pseudexostoma
Teeth in lower jaw Homodont: pointed Heterodont; spatulate at front, pointed at rear Homodont: oarshaped, flatted distally Heterodont: spatulate at front, pointed at rear
Tooth patches in upper jaw Joined, appearing united, not produced posteriorly at sides Joined, appearing united, rounded laterally Separated Separated
Teeth in upper jaw Homodont: pointed Homodont: pointed Homodont: oarshaped, flatted distally Heterodont: teeth spatulate at front, pointed at rear
Branched pectoral fin rays 10, 16-19 16-18 10-11 16-18