New Estuarine Species of Mystus (Teleostei: Bagridae) from the Malay Peninsula
Mystus armiger, a new species of estuarine bagrid catfish, is described from the mouth of the Kelantan River in the northeastern part of the Malay Peninsula. Mystus armiger resembles Mystus wolffii, both species easily distinguished from congeners by their uniform color without any dark markings, approximately equal lengths of adipose- and anal-fin bases, and long maxillary barbels that reach at least to the base of the caudal fin. Mystus armiger differs from M. wolffii in having a broader snout, smaller eye (17.5–22.8% HL vs 22.8–27.0), and fewer larger serrations on the pectoral spine.Abstract
Mystus armiger, CAS 218896, holotype, 107.9 mm SL; Malaysia: Kelantan, Kelantan River. Dorsal, lateral and ventral views
Dorsal views of heads of (A) Mystus armiger, CAS 65248, paratype, 115.3 mm SL; (B) Mystus wolffii, ZMA 120.693, 114.5 mm SL. Nasal and maxillary barbels truncated (to show outlines more clearly). Scale bar represents 10 mm
Pectoral spines of (A) Mystus armiger, CAS 65248, paratype, 115.3 mm SL; (B) Mystus wolffii, ZMA 120.693, 114.5 mm SL. Scale bar represents 5 mm
Biplot of eye diameter against standard length for Mystus armiger and Mystus wolffii
Contributor Notes
Fish Division, Museum of Zoology, University of Michigan, 1109 Geddes Avenue, Ann Arbor, Michigan 48109-1079. heokheen@umich.edu