From The Collaborative International Dictionary of English v.0.48 :
Mustelus \Mustelus\ prop. n. A genus of sharks including certain of the smooth dogfishes. Syn: genus Mustelus. [WordNet 1.5]From WordNet (r) 3.0 (2006) :
Mustelus n 1: smooth dogfishes [syn: Mustelus, genus Mustelus]