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Euchiloglanis Regan, 1907 ZBK

Fig. 18

Chimarrichthys Sauvage, 1874 ZBK : 332. (Types species: Chimarrichthys davidi Sauvage, 1874 ZBK , by monotypy). Gender masculine.

Euchiloglanis Regan, 1907 ZBK : 158. (Types species: Chimarrichthys davidi Sauvage, 1874 ZBK , by being a replacement name. Proposed as a replacement for Chimarrichthys Sauvage, 1874 ZBK , then considered to be preoccupied by Cheimarrichthys Haast, 1874 ZBK in fishes). Gender masculine.

Coraglanis Hora & Silas, 1952b ZBK : 12. (Type species: Euchiloglanis kishinouyei Kimura, 1934 ZBK , by original designation). Gender masculine. Synonomized with Euchiloglanis ZBK 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 ZBK is distinguished from Oreoglanis ZBK , Pseudexostoma ZBK , Exostoma ZBK , Myersglanis ZBK , and Parachiloglanis ZBK by having an interrupted post-labial groove (Table 5). Euchiloglanis ZBK is distinguished from Pareuchiloglanis ZBK 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 ZBK by having the gill openings not extending onto the venter, and from Glaridoglanis ZBK 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 ZBK
Interrupted (Fig. 17b) Glyptosternon ZBK Euchiloglanis ZBK Glaridoglanis ZBK Pareuchiloglanis ZBK
Continuous (Fig. 17c) Myersglanis ZBK Oreoglanis ZBK Exostoma ZBK Pseudexostoma ZBK

TABLE 6. External traits diagnostic for genera of Glyptosternina with an interrupted post-labial groove on the lower jaw.

Glyptosternon ZBK Euchiloglanis ZBK Glaridoglanis ZBK Pareuchiloglanis ZBK
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 ZBK Oreoglanis ZBK Exostoma ZBK Pseudexostoma ZBK
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

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