The Trachymedusae are an order in the cnidarian class Hydrozoa. They contain some 50 species, divided among about 30 genera and five families, of which the Rhopalonematidae are by far the most diverse. They only reproduce sexually as medusae, never forming polyps. It is not known with certainty whether the group as delimited here is indeed monophy...
Found on
http://en.wikipedia.org/wiki/Trachymedusae
• (n. pl.) A division of acalephs in which the development is direct from the eggs, without a hydroid stage. Some of the species are parasitic on other medusae.
Found on
http://thinkexist.com/dictionary/meaning/trachymedusae/
(from the article `cnidarian`) ...unknown.Suborder NarcomedusaeScalloped margin; gonads on stomach walls. Manubrium lacking.Suborder TrachymedusaeSmooth bell margin; gonads on ...
Found on
http://www.britannica.com/eb/a-z/t/68
No exact match found.
