Examples from the Web for cnidaria
Real parasites are not numerous among the sponges and cnidaria.
On the other hand, the cnidaria develop into higher radial (star-shaped) persons, and the platodes into lower bilateral persons.
In this way is formed a ring of tentacles, the most characteristic organs of the Cnidaria.
Flagellated epithelium is especially found in the cnidaria and platodes; ciliated epithelium mostly in the vermalia and mollusca.
I began with the consideration of the simplest sponges (olynthus) and cnidaria (hydra).
Word Origin and History for cnidaria
phylum of stinging invertebrates, from Modern Latin cnida, from Greek knide "nettle," from stem of knizein "to scratch scrape." Related: Cnidarian.