Hy·per·o·tre·ta n. pl.  Zool. 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.]
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  Hyperotreta
       n : hagfishes as distinguished from lampreys [syn: Myxiniformes,
            suborder Myxiniformes, suborder Hyperotreta, Myxinoidei,
            Myxinoidea, suborder Myxinoidei]