Category
page 1Trachymedusae
Trachymedusae
Trachymedusae belong to the phylum Cnidaria and the class Hydrozoa. The Trachymedusae include five families, among which are 30 genera and around 50 species in all. The family Rhopalonematidae has the greatest diversity.
Rhopalonematidae
Rhopalonematidae is a family of hydrozoans. The family comprises 15 genera and 36 species.

Halicreatidae
Halicreatidae is a family of hydrozoans. The family comprises 6 genera and 9 species.
Petasidae
Petasidae is a family of cnidarians belonging to the order Trachymedusae.
Ptychogastriidae
Ptychogastriidae is a family of cnidarians belonging to the order Trachymedusae.