cnidaria
刺丝虫类,刺丝藻类,刺胞类动物,刺胞动物
Definitions
- 1
Zoology.
- : an alternative name for the invertebrate phylum Coelenterata, giving emphasis to the stinging structures as characteristic of the phylum.
Examples
That finding suggests that the Cnidaria phylum of animals, which includes hydras and jellyfish, already had some genetic components of sleep regulation before it diverged from the ancestors of other groups of animals.
On the other hand, the cnidaria develop into higher radial (star-shaped) persons, and the platodes into lower bilateral persons.
Self-cleavage is also found among the higher multicellular organisms—namely, the cnidaria (polyps, medus).
Flagellated epithelium is especially found in the cnidaria and platodes; ciliated epithelium mostly in the vermalia and mollusca.
In this way is formed a ring of tentacles, the most characteristic organs of the Cnidaria.
Real parasites are not numerous among the sponges and cnidaria.