heteroacanthus armature
From ZooTerms (Dictionary of Invertebrate Zoology)
heteroacanthus armature: (Platyhelminthes: Cestoda) Hooks arranged in semicircles from the internal surface to the external surface of the tentacles without chainettes. a. Atypica: differing numbers of hook rows on the internal and external surface of the tentacles. b. Typica: same number of hook rows, etc.
