Write a short notes on class Anthozoa.
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Anthozoa are a class in the phylum Cnidaria. It includes the sea anemones and the corals. It is a monophyletic clade, one of two in the Cnidaria. The other is the Medusozoa.[1]
The class does not have a medusa larvalstage in its development, unlike the rest of the phylum. Like all Cnidaria, their food-catching and defense are done by nematocysts, which are extremely effective stinging cells. Over 6,100 species have been described.[2][3]
There are three subclasses:
Ceriantharia: the tube-dwelling anemones or cerianthidsHexacorallia: 4,300 species of colonialpolyps, usually with 6-fold symmetry. This includes all of the stony corals, which are vital for coral reef formation, and all sea anemones, and zoanthids.Octocorallia: 3,000 species of colonial polyps with 8-fold symmetry.[1] It includes the blue coral, soft corals, sea pens, and gorgonians (sea fans and sea whips).
The class does not have a medusa larvalstage in its development, unlike the rest of the phylum. Like all Cnidaria, their food-catching and defense are done by nematocysts, which are extremely effective stinging cells. Over 6,100 species have been described.[2][3]
There are three subclasses:
Ceriantharia: the tube-dwelling anemones or cerianthidsHexacorallia: 4,300 species of colonialpolyps, usually with 6-fold symmetry. This includes all of the stony corals, which are vital for coral reef formation, and all sea anemones, and zoanthids.Octocorallia: 3,000 species of colonial polyps with 8-fold symmetry.[1] It includes the blue coral, soft corals, sea pens, and gorgonians (sea fans and sea whips).
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