Hallaxa apefae is a species of sea slug or dorid nudibranch, a marine gastropod mollusk in the family Actinocyclidae.Gosliner T.M. & Johnson S. (1994) Review of the genus Hallaxa (Nudibranchia: Actinocyclidae) with descriptions of nine new species. The Veliger 37(2): 155-191. [1 April 1994] Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=532896 on 2012-02-26 It is found in the Caribbean and South America. References