| Trachymedusae | |
|---|---|
| |
| Crossota sp. | |
Scientific classification 
| |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Cnidaria |
| Class: | Hydrozoa |
| Subclass: | Trachylinae |
| Order: | Trachymedusae Haeckel, 1866 (1879) |
| Families | |
Trachymedusae belong to the phylum Cnidaria and the class Hydrozoa, among the 30 genera are 5 families containing around 50 species in all, the family Rhopalonematidae has the greatest diversity.[1]