The Collaborative International Dictionary of English v.0.48:

Mirounga \Mirounga\ prop. n.
   A genus comprising the elephant seals.

   Syn: genus Mirounga.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Mirounga
    n 1: elephant seals [syn: Mirounga, genus Mirounga]