Vol. 40 No. 2, 2001
Clarias microstomus, a New Species of Clariid Catfish from Eastern Borneo (Teleostei: Siluriformes)
Heok-Hee Ng
Fish
Division, Museum of Zoology, University of Michigan, 1109 Geddes
Avenue, Ann Arbor, Michigan 48109-1079, USA Department of Biological
Sciences, National University of Singapore, Kent Ridge Crescent,
Singapore 119260, Republic of Singapore
Heok-Hee Ng (2001) Clarias microstomus,
a new species of clariid catfish is de- scribed from the Kayan and
Mahakam River drainages in eastern Borneo. It differs from its
congeners in having a narrow snout (with an egg-shaped head), a
gently-sloping anterior margin of the dorsal fin, and a unique
combination of the following characters: a gray body with white spots,
a smooth anterior edge of the pectoral spine, a head length of
21.4%-22.5% SL, a head depth of 67.1%-70.6% HW, and an interorbital
distance of 46. 7%-50.2 % HL.
Key words: Clariidae, Kalimantan Tengah, Kayan River, Mahakam River.
*Correspondence: Fax: 1-734-7634080. E-mail: heokheen@umich.edu
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