Comprehensive DescriptionRead full entry
Euchiloglanis Regan, 1907 ZBK
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.
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|