|Siphonophorae from Ernst Haeckel's 1904 Kunstformen der Natur|
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".
- Order Anthomedusae - includes Laingoimedusae but monophyly requires verification
- Order Leptomedusae
- Order Siphonophorae
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:
- Order Anthoathecatae
- Order Laingiomedusae
- Order Siphonophora
- Suborders Anthomedusae and Leptomedusae of order Hydroida
A very old classification that is sometimes still seen had them in:
The system used by Animal Diversity Web uses:
Catalogue of Life uses:
- Peter Schuchert (2005). "Hydrozoan Phylogeny and Classification". The Hydrozoa Directory. Retrieved July 8, 2008.
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