These so-called " ferns " are dead and dried colonies of hydrozoans, colonies of class Hydrozoa, phylum Cnidaria.
12.
That research also proposes coronate Scyphozoa and Cubozoa as a sister clade to Hydrozoa and discomedusan Scyphozoa, which are themselves sister groups.
13.
His last publication, the modestly named " An Introduction to Hydrozoa ", is the standard work on this group of animals.
14.
Modern taxonomies place the comb jellies in their own phylum Ctenophora and the jellyfish, sea anemones, and Hydrozoa together in the phylum Cnidaria.
15.
In the class Hydrozoa, the polyps are indeed often very simple, like the common little fresh water species of the genus " mesenteries.
16.
Huxley united the Hydroid and Sertularian polyps with the Medusae to form a class to which he subsequently gave the name of " Hydrozoa ".
17.
As regards internal structure, polyps exhibit two well-marked types of organization, each characteristic of one of the two classes, Hydrozoa and Anthozoa.
18.
Campanulariidae is composed entirely of hydroids, a Greek term meaning " water animals " applied to the plant-like polyp colonies of the class Hydrozoa.
19.
"' Trachymedusae "'belong to the phylum Cnidaria and the class Hydrozoa, among the 30 genera are 5 families containing around 50 species in all, the family Rhopalonematidae has the greatest diversity.
20.
When at last he got a grant from the Royal Society for the printing of plates, Huxley was able to summarise this work in " The Oceanic Hydrozoa ", published by the Ray Society in 1859.
