The Collaborative International Dictionary of English v.0.48:

Mugiloidea \Mugiloidea\ prop. n.
   A suborder of fishes distinguished by abdominal pelvic fins,
   including the families Mugilidae; Atherinidae; and
   Sphyraenidae.

   Syn: suborder Mugiloidea.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Mugiloidea
    n 1: fishes distinguished by abdominal pelvic fins: families
         Mugilidae; Atherinidae; Sphyraenidae [syn: Mugiloidea,
         suborder Mugiloidea]