Cynoglossus waandersii (Bleeker 1854)

Blind side of body and head region with ctenoid scales throughout. About 24 scales between dorsolateral and midlateral lines (Ref 9895).

Cynoglossus waandersi (Bleeker)

Plagusia waandersii Bleeker, 1854a:98 [type-locality: confluence of rivers Lamatang and Enim at Felembang, eastern Sumatra].

Arelia waandersii.—Bleeker, 1859:185.

Cynoglossus waandersi.—Bleeker, 1875:31, pl. 241: fig. 2.—Weber and de Beaufort, 1929:189.

DESCRIPTION.—Based on a single specimen, 73.0 mm SL.

Depth of body 27.40 percent of standard length, length of head 24.66 percent. Diameter of eye 11.11, interorbital space 5.56 percent of length of head. Two nostrils on ocular side, anterior nostril tubular, in front of lower eye, posterior nostril simple, immediately in front of interorbital space. Snout obtusely pointed, 41.67 percent of length of head; rostral hook, rather short, ends in front of anterior border of fixed eye. Maxillary extending to below posterior half of fixed eye; angle of mouth extending below vertical from middle of fixed eye, nearer to tip of snout than branchial opening; tip of snout to angle of mouth 47.22, angle of mouth to branchial opening 55.56 percent of length of head.

Scales: Ctenoid on both sides.

Lateral-Line System: Three lateral lines on ocular side, midlateral line with 80 scales, 24 scales between middle and upper lateral lines. No lateral line on blind side.

Fins: Dorsal with 89 rays, anal with 67 rays, caudal 10 in 1 specimen (radiograph).

Vertebrae: 42, comprising 9 abdominal and 33 caudal elements (radiograph).

Coloration: Upper side yellowish brown, with darker patches, lower whitish in preserved specimens.

Size: The only specimen examined, 83 (73 + 10) mm, is from Sumatra (reported up to 300 mm by Weber and de Beaufort).

DISTRIBUTION.—Sumatra and Borneo, in rivers.

DIAGNOSIS AND