argulus

from The Collaborative International Dictionary of English v.0.48
Argulus \Ar"gu*lus\, n. [NL., dim of Argus.] (Zool.)
   A genus of copepod Crustacea, parasitic of fishes; a fish
   louse. See {Branchiura}.
   [1913 Webster]
    
from The Collaborative International Dictionary of English v.0.48
Branchiura \Bran"chi*u"ra\, n. pl. [NL., fr., Gr. ? gill +
   o'yra` tail.] (Zool.)
   A group of Entomostraca, with suctorial mouths, including
   species parasitic on fishes, as the carp lice ({Argulus}).
   [1913 Webster]
    

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