Cnidaria

[ nahy-dair-ee-uh ]

/ naɪˈdɛər i ə /

an alternative name for the invertebrate phylum Coelenterata, giving emphasis to the stinging structures as characteristic of the phylum.

Origin of Cnidaria

From New Latin; see origin at cnida, -aria

Real parasites are not numerous among the sponges and cnidaria.

The Wonders of Life |Ernst Haeckel
On the other hand, the cnidaria develop into higher radial (star-shaped) persons, and the platodes into lower bilateral persons.

The Wonders of Life |Ernst Haeckel
In this way is formed a ring of tentacles, the most characteristic organs of the Cnidaria.

Encyclopaedia Britannica, 11th Edition, Volume 14, Slice 2 |Various
Flagellated epithelium is especially found in the cnidaria and platodes; ciliated epithelium mostly in the vermalia and mollusca.

The Wonders of Life |Ernst Haeckel

I began with the consideration of the simplest sponges (olynthus) and cnidaria (hydra).

The Wonders of Life |Ernst Haeckel