The Collaborative International Dictionary of English v.0.48:

Leiopelmatidae \Leiopelmatidae\ n.
   A natural family of primitive New Zealand frogs. [Also
   spelled Liopelmidae.]

   Syn: family Leiopelmatidae, Liopelmidae, family
        Liopelmidae.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Liopelmidae
    n 1: primitive New Zealand frogs [syn: Leiopelmatidae, family
         Leiopelmatidae, Liopelmidae, family Liopelmidae]