Cnidaria [SEP] parent taxon
cycles of asexual polyp stages and sexual medusae. Some, however, omit either the polyp or the medusa stage.
Cnidarians were formerly grouped with ctenophores in the phylum Coelenterata, but increasing awareness of their differences caused them to be placed in separate phyla. Cnidarians are classified into four main groups: the almost wholly sessile Anthozoa (sea anemones, corals, sea pens); swimming Scyphozoa (jellyfish); Cubozoa (box jellies); and Hydrozoa, a diverse group that includes all the freshwater cnidarians as well as many
Terrazoanthus onoi
Terrazoanthus onoi is a species of uncertain validity (taxon inquirendum) of macrocnemic zoanthid first found in the Galapagos. It is potentially a junior synonym of "Terrazoanthus patagonichus". It can be distinguished by its bright red oral disk colour, having about 32–40 tentacles, and having only basitrichs and mastigophores present in its pharynx. 
Further reading.
- Swain, Timothy D., and Laura M. Swain. "Molecular parataxonomy as taxon description: examples from recently named Zoanthidea (Cnidaria: Anthozoa) with revision based