The Collaborative International Dictionary of English v.0.48:

Alopius \Alopius\ n.
   1. 1 type genus of the family Alopiidae; in some
      classifications considered a genus of the family Lamnidae.

   Syn: genus Alopius
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Alopius
    n 1: type genus of the family Alopiidae; in some classifications
         considered a genus of the family Lamnidae [syn: Alopius,
         genus Alopius]