n. In ichthyology, a genus of anguilliform fishes: generally accounted a synonym of Muræna. Forster, 1778.n. In herpetology, a genus of reptiles: used by Wagler and others for the genus of vipers (Viperidæ) called Bitis by Gray and Cope. Merrem, 1820.n. In mammalogy:n. The typical genus of the family Echidnidæ, containing the aculeated ant-eater or spiny ant-eater of Australia and Tasmania, E. hystrix or aculeata, and another species, E. lawesi of New Guinea, together with a fossil one, E. oweni.n. [lowercase] A species of the genus Echidna or family Echidnidæ.n. A genus of echinoderms.