Encyclopedia of Life · EOL (see source)
Limnomedusae
Sign in to saveLimnomedusae is an order of hydrozoans.
Species
淡水クラゲ目
ORDER
- KingdomAnimalia
- PhylumCnidaria
- ClassHydrozoa
- OrderLimnomedusae
淡水水母目（Limnomedusae）属刺胞动物门、水螅纲，顾名思义是一類生活在淡水中的水母。水螅蟲裸露，並在水螅的莖分枝，屬於一種小型的水母，身長約1毫米到30毫米。据记载：欧、亚、美洲和大洋洲的温带地区，都曾发现淡水水母目動物的存在。現時淡水水母目大約有54個不同的屬。
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Wikidata facts
- Instance of
- taxon
- Parent taxon
- Trachylinae
- Image
- Olindias formosa1.jpg
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- Commons category
- Limnomedusae
- taxon rank
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- Limnomedusae
- topic's main category
- Category:Limnomedusae
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Encyclopedic overview
3 sectionsContents
- Taxonomy
- Systematic list
- References
Limnomedusae is an order of hydrozoans.
==Taxonomy== The taxon was erected by Danish marine biologist Paul Lassenius Kramp in 1938 to accommodate certain families of hydrozoans with biphasic life histories. It includes genera with medusae with ecto-endodermal statocysts 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.
Excerpted from Wikipedia’s “Limnomedusae” article, available under the CC BY-SA 4.0 licence.