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Haeckel Siphonophorae.jpg
Siphonophorae from Ernst Haeckel's 1904 Kunstformen der Natur
Scientific classification e
Kingdom: Animalia
Phylum: Cnidaria
Class: Hydrozoa
Subclass: Leptolinae
Haeckel, 1879

See text.

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

Leptolinae (or Leptolina) are a subclass of the Hydrozoa class in the cnidarian phylum. They contain the bulk of the paraphyletic "Hydroida" which were one of the main groupings of the Hydrozoa in older classifications and were placed at order rank. They also include, however, the highly advanced colonial jellies of the Siphonophora, which were not included in the "Hydroida".[1]


Some sources (e.g. ITIS) use the younger alternate names Hydroidolina or Hydroidomedusa for Leptolina(e). The classification below is based on Schuchert (2005).[1]


Other 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 traditional 19th-century system had the Leptominae dispersed among the following taxa:

A very old classification that is sometimes still seen had them in:

The system used by Animal Diversity Web uses:

Catalogue of Life uses:


  1. ^ a b Peter Schuchert (2005). "Hydrozoan Phylogeny and Classification". The Hydrozoa Directory. Retrieved July 8, 2008.