Vol. 38 No. 3, 1999

The Fishes of the Endau Drainage, Peninsular Malaysia with Descriptions of Two New Species of Catfishes (Teleostei: Akysidae, Bagridae)

Heok-Hee Ng* and Heok-Hui Tan

Department of Biological Sciences, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260

Heok-Hee Ng and Heok-Hui Tan (1999) An annotated checklist of the fishes of the Endau River drainage in southeastern Peninsular Malaysia is provided. A total of 108 species in 26 families is reported from the Endau basin, of which 36 are new records and 2 are new species of catfish described here. Akysis microps, new species (Akysidae) resembles A. heterurus, but differs from it and other congeners by the following unique combination of characters: depth of caudal peduncle 8.3%- 9.6% SL, length of anal-fin base 16.2%-18.6% SL, length of adipose-fin base 15.2%-23.0% SL, eye diameter 9%-13% HL, length of nasal barbel 95%-106% HL, length of maxillary barbel 139%-170% HL, length of inner mandibular barbel 94-102% HL, length of outer mandibular barbel 110%-154% HL, 10-11 anal-fin rays, and 5-7 serrations on the posterior edge of the pectoral spine. Nanobagrus nebulosus, new species (Bagridae), is characterized by large eyes (eye diameter 14.1%-15.1% HL), pectoral spine with 16 serrations on the posterior edge, 35-36 vertebrae, and a dark grayish-brown body with a series of cream-colored spots mostly on the dorsal surface of the body. It is also the 1st record of the genus from Peninsular Malaysia.

Key words: Nanobagrus, Akysis, New species, New records.

*Correspondence: Fax: 65-7792486. E-mail: scip7116@leonis.nus.edu.sg