Capitata is a suborder of Hydrozoa, a class of marine invertebrates belonging to the phylum Cnidaria.
Characteristics Members of this suborder are characterised by the tentacles of the polyps terminating in knobs. In some species these are only present in juvenile forms being replaced in adults by more threadlike tentacles. A high nematocyst concentration is present in the knobs. A few species in this group are better known as their solitary medusa form than as their polyp form. These include Sarsia, Polyorchis and Cladonema.
Families
According to the World Register of Marine Species, the following families are found in this suborder :
Asyncorynidae Kramp, 1949 Cladocorynidae Allman, 1872 Cladonematidae Gegenbaur, 1857 Corynidae Johnston, 1836 Halimedusidae Arai & Brinckmann-Voss, 1980 Hydrocorynidae Rees, 1957 Milleporidae Fleming, 1828 Moerisiidae Poche, 1914 Pennariidae McCrady, 1859 Porpitidae Goldfuss, 1818 Pseudosolanderiidae Bouillon & Gravier-Bonnet, 1988 Rosalindidae Bouillon, 1985 Solanderiidae Marshall, 1892 Sphaerocorynidae Prévot, 1959 Teissieridae Bouillon, 1978 Tricyclusidae Kramp, 1949 Zancleidae Russell, 1953 Zancleopsidae Bouillon, 1978
References