Hydroidolina

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]

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

See text.

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

Taxonomy and systematics

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

Subclass Hydroidolina

Alternate classifications

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.

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gollark: That can explain what we see perfectly ("the current goblin dictator wants them to follow these rules") but also everything else ("the goblin society is in anarchy and does X weird stuff").
gollark: Imagine I make up the goblin theory of matter, in which all particles are tiny goblins which just do whatever they want.
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References
  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.


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