Perennibranchiate /(?)/

Per·en·ni·bran·chi·ate

Perennibranchiate

a.
  1. Having branchæ, or gills, through life; -- said especially of certain Amphibia, like the menobranchus. Opposed to caducibranchiate. (Anat.)
  2. Belonging to the Perennibranchiata. (Zool.)