Zoantharia (also known as Hexacorallia, as they have 6-fold symmetry) is a subclass of the class Anthozoa within the phylum Cnidaria. It includes the sea anemones and most existing corals (except for the soft corals in order Alcyonacea of the sister subclass Alcyonaria, the Octocorallia). It also includes the significant extinct orders of the rugose corals and tabulate corals Download high resolution version (1024x508, 164 KB) Wikipedia does not have an article with this exact name. ... Scientific classification or biological classification is a method by which biologists group and categorize species of organisms. ... Animalia redirects here. ... Classes Anthozoa - Corals and sea anemones Scyphozoa - Jellyfish Staurozoa - Stalked jellyfish Cubozoa - Sea wasps or box jellyfish Polypodiozoa Hydrozoa - Hydroids, hydra-like animals Cnidaria[1] (IPA: [2]) is a phylum containing some 11,000 species of relatively simple animals found exclusively in aquatic, mostly marine, environments. ... Anthozoa is a class within the phylum Cnidaria that contains the sea anemones and corals. ... Anthozoa is a class within the phylum Cnidaria that contains the sea anemones and corals. ... Classes Anthozoa - Corals and sea anemones Scyphozoa - Jellyfish Staurozoa - Stalked jellyfish Cubozoa - Sea wasps or box jellyfish Polypodiozoa Hydrozoa - Hydroids, hydra-like animals Cnidaria[1] (IPA: [2]) is a phylum containing some 11,000 species of relatively simple animals found exclusively in aquatic, mostly marine, environments. ... Families Many, see text. ... Subclasses Alcyonaria Zoantharia See text for orders. ... Families Suborder Alcyoniina Suborder Calcaxonia Suborder Holaxonia Suborder Protoalcyonaria Suborder Scleraxonia Suborder Stolonifera Suborder Incertae sedis Wikispecies has information related to: Alcyonacea Wikimedia Commons has media related to: Category:Alcyonaria The Alcyonacea, or the soft corals are an order of corals which do not produce calcium carbonate cups. ... Families Suborder Alcyoniina Suborder Calcaxonia Suborder Holaxonia Suborder Protoalcyonaria Suborder Scleraxonia Suborder Stolonifera Suborder Incertae sedis Wikispecies has information related to: Alcyonacea Wikimedia Commons has media related to: Category:Alcyonaria The Alcyonacea, or the soft corals are an order of corals which do not produce calcium carbonate cups. ... Also called tetracoralla, the Rugosa are an extinct group of corals that were abundant in Middle Ordovician to Late Permian seas. ... Tabulate Corals lived entirely during the Paleozoic. ...
The subclass is divided into a number of orders; those which are extinct are marked with †.
The Hexacorallia can all be considered to belong to the Oxystaura hexaphragma, although there are some that are close to Isopola hexactinota.
While in the Octocorallia the number of septa does not, after the four pairs have been initiated more or less simultaneously, exceed the number 8, in the Hexacorallia the initial pairs of septa are not laid down simultaneously, but after each other in a definite order.
So the basic form of the coral is indeed that of the Hexaphragma (six antimers, two mirror planes containing the heteropolar main body axis, which is perpendicular to the plane of the drawing).
The term Hexacorallia for the subclass is used widely in biology (e.g.
Zoantharians occur in all seas, from the high intertidal to the deepest trenches, and from the poles to the equator, although some taxa occur exclusively in particular types of habitats, such as cerianthids only subtidally in soft sediments, and ptychodactiarians only at high latitudes.
Although the name Hexacorallia has been used for the subclass, almost no extant members have only six tentacles or mesenteries; rather, the individual polyp of these cnidarians is typically characterized by approximately a multiple of six tentacles and mesenteries.
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