found: Web. 3(Hydrozoa: a class of coelenterates; hydrozoan: one of the Hydrozoa)
found: Hydrozoa directory, Aug. 15, 2007(Class Hydrozoa)
found: World register of marine species, via WWW, Apr. 22, 2013:Hydroidolina (Hydroidolina. Status: accepted. Rank: Subclass. Parent: Hydrozoa. Synonymised taxa: Hydroida (synonym), Hydroidomedusae (not a monophyletic group), Leptolida (not a monophyletic group), Leptolinae (not a monophyletic group). Vernacular names: hydroids (from synonym). Direct child taxa: Order Anthoathecata, Order Leptothecata, Order Siphonophorae. Order Anthomedusae represented as Anthoathecata (alternate representation, synonym); Order Athecata represented as Anthoathecata (alternate representation, synonym); Order Leptomedusae represented as Leptothecata (alternate representation, synonym); Order Thecata represented as Leptothecata (alternate representation, synonym); Order Gymnoblastea accepted as Anthoathecata; Order Laingiomedusae accepted as Anthoathecata; Order Siphonophora accepted as Siphonophorae) Hydrozoa (Hydrozoa. Status: accepted. Rank: Class. Parent: Cnidaria. Vernacular names: hydroids, hydromedusae, hydrozoans. Direct child taxa: Subclass Hydroidolina, Subclass Trachylinae. Subclass Automedusae accepted as Trachylinae; Order Hydroida accepted as Hydroidolina; Infraclass Hydroidomedusae accepted as Hydroidolina; Subclass Leptolida accepted as Hydroidolina; Order Leptolinae accepted as Hydroidolina)
found: ITIS, Apr. 22, 2013:Hydroida (Hydroida. Taxonomic Rank: Order. Common Name(s): medusae. Valid Name: Hydroidolina. Taxonomic Status - Current Standing: invalid. Members of the Hydroida Johnston, 1836 are currently recognized as belonging to the Hydroidolina) Hydrozoa (Hydrozoa. Taxonomic Rank: Class. Synonym(s): Leptolida. Common Name(s): hydralike animals; hydroids; hydrozoans. Taxonomic Status - Current Standing: valid. Direct Children: Subclass Hydroidolina Subclass Trachylina. Children with Uncertain Position: Order Limnomedusae)
found: Wikipedia, Apr. 22, 2013(Hydroida is an obsolete cnidarian order which united such animals as hydras, hydromedusae, and many marine attached hydroids. However, the group is paraphyletic and not composed from close relatives. But for the largest part, this group makes up what today is usually considered the subclass Leptolinae (or Hydroidolina) which also includes the colonial jellies of the Siphonophora which were not part of the Hydroida.)
