(Zool.) The Athecata; - so called because the medusoid buds are not inclosed in a capsule.
Gymnoblastea
enUK
Gymnoblastea
[‚jim·nə′blas·tē·ə] (invertebrate zoology) A suborder of cnidarians in the order Hydroida comprising hydroids without protective cups around the hydranths and gonozooids.