Trachylinae

Trachylinae
	Crossota sp.
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Cnidaria
Class:	Hydrozoa
Subclass:	Trachylinae; Haeckel, 1879
Orders
	Actinulidae Swedmark & Teissier, 1958; Limnomedusae (but see text); Narcomedusae Haeckel, 1879; Trachymedusae
Synonyms
	Trachylida; Trachylidae; Trachylina; Trachylinida

Trachylinae (also Trachylina, Trachylinida, etc.) are a cnidarian subclass of the Hydrozoa. They are placed at order rank in many older classifications, and limited to contain the Narcomedusae and Trachymedusae. But the Actinulidae, then considered an independent order, and probably also the Limnomedusae which were traditionally placed in the paraphyletic "Hydroida", belong to this group too. It is not entirely clear whether the Limnomedusae and the Trachymedusae as conventionally circumscribed are monophyletic^[1]

The freshwater jelly Craspedacusta sowerbyi is a well-known member of the Limnomedusae and might thus belong here.

Footnotes

^ Schuchert (2005)

References

Schuchert, Peter (2005): The Hydrozoa Directory - Hydrozoan Phylogeny and Classification. Retrieved 2008-JUL-08.

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[1] Schuchert (2005)

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