The Collaborative International Dictionary of English v.0.48:

Hyperoartia \Hy`per*o*ar"ti*a\, n. pl. [NL.] (Zool.)
   An order of marsipobranchs including the lampreys. The
   suckerlike moth contains numerous teeth; the nasal opening is
   in the middle of the head above, but it does not connect with
   the mouth. See Cyclostoma, and Lamprey.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Hyperoartia
    n 1: lampreys as distinguished from hagfishes [syn:
         Petromyzoniformes, suborder Petromyzoniformes,
         Hyperoartia, suborder Hyperoartia]