Limnomedusae
| Limnomedusae | |
|---|---|
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| Olindias formosa | |
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Cnidaria |
| Class: | Hydrozoa |
| Subclass: | Trachylinae |
| Order: | Limnomedusae |
| Genera | |
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The Limnomedusae are an order of jellyfish in the class Hydrozoa.
The taxon was created by Kramp in 1938 to accommodate certain families of jellyfish with life histories. It includes genera with medusae with ecto-endodermal and with gonads alongside their radial canals, and also genera which have polyps that are not covered by a theca. Molecular analysis performed by Collins in 2006 has since shown that the Limnomedusae are not monophylic. The family Armorhydridae, which contains a single genus and a single species, Armorhydra janowiczi, is found living in coarse sediment, has hollow tentacles and has no radial canals. It seems to share few morphological features with the other families and probably belongs elsewhere. The inclusion of Microhydrulidae is also dubious. The medusa stage is not known and the tiny polyp has no tentacles nor mouth.
The World Register of Marine Species currently lists these families and genera:
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