tectibranch

tectibranch

(ˈtɛktɪˌbræŋk)
n
(Animals) a mollusc of the suborder Tectibranchia (or Tectibranchiata) (order: Opisthobranchia) which includes the sea slugs and sea hares
[C19: New Latin, from tectus covered, from tegere to cover + branchia: see -branch]