What is "hyperotreta"

Hyperotreta \Hy`per*o*tre"ta\ (h[imac]`p[~e]r*[-o]*tr[=e]"t[.a]), n. pl. [NL., fr. Gr. "yperw`,n the palate + trhto`s perforated.] (Zo["o]l.) An order of marsipobranchs, including the Myxine or hagfish and the genus Bdellostoma. They have barbels around the mouth, one tooth on the palate, and a communication between the nasal aperture and the throat. See Hagfish. [Written also Hyperotreti.]