Trachylinae

Trachylinae
Crossota sp.
Scientific classification
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

1. Schuchert (2005)

References

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