HyperoartiaHy`per*o*ar"ti*a\, n. pl. [NL.] (Zo["o]l.) 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.
|lampreys as distinguished from hagfishes [syn: Petromyzoniformes]|