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Haeckel Siphonophorae.jpg
Siphonophorae from Ernst Haeckel's 1904 Kunstformen der Natur
Scientific classification edit
Kingdom: Animalia
Phylum: Cnidaria
Class: Hydrozoa
Subclass: Hydroidolina
Marques & Collins, 2004

See text.

  • Hydroida
  • Hydroidae
  • Hydroidolinae Marques & Collins, 2004
  • Hydroidomedusa
  • Hydroidomedusae
  • Leptolida Haeckel, 1879
  • Leptolina Haeckel, 1879
  • Leptolinae Haeckel, 1879

Hydroidolina is a subclass of hydrozoans in the phylum Cnidaria. It contains the bulk of the paraphyletic "Hydroida" which were one of the main groupings of the class Hydrozoa in older classifications and were placed at order rank. Hydroidolina also includes, however, the highly advanced colonial jellies of Siphonophora, which were not included in the "Hydroida".[1]

Taxonomy and systematics[edit]

The classification below is based on the World Register of Marine Species:[2]

Subclass Hydroidolina

Alternate classifications[edit]

Other hydrozoan classifications, which are beset by paraphyly however, are still often seen. They do not unite the Leptolinae in a monophyletic taxon and thus do not have any merit according to modern understanding of hydrozoan phylogeny. The alternate name Leptolinae (or Leptolina) was used in older sources for Hydroidolina.

The obsolete name Hydroida was used for a paraphyletic grouping that is now considered synonymous with Hydroidolina but did not include the colonial jellies of the order Siphonophorae.


  1. ^ Peter Schuchert (2005). "Hydrozoan Phylogeny and Classification". The Hydrozoa Directory. Retrieved July 8, 2008.
  2. ^ "WoRMS - World Register of Marine Species - Hydroidolina". marinespecies.org. Retrieved 2018-03-15.