''Petasiella'' is a monotypic genus of hydrozoans belonging to the family

Petasidae Petasidae is a family of cnidarians belonging to the order Trachymedusae 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 ha ...

. The only species is ''Petasiella asymmetrica''. The species is found in

Malesia Malesia is a biogeographical region straddling the Equator and the boundaries of the Indomalayan and Australasian realms, and also a phytogeographical floristic region in the Paleotropical Kingdom. It has been given different definitions. The ...

References

Petasidae Hydrozoan genera Monotypic cnidarian genera {{hydrozoa-stub