''Tetrapoma'' is a
monotypic genus
In biology, a monotypic taxon is a taxonomic group (taxon) that contains only one immediately subordinate taxon. A monotypic species is one that does not include subspecies or smaller, infraspecific taxa. In the case of genera, the term "unispe ...
of
hydrozoa
Hydrozoa (hydrozoans; ) are a taxonomic class of individually very small, predatory animals, some solitary and some colonial, most of which inhabit saline water. The colonies of the colonial species can be large, and in some cases the specializ ...
ns belonging to the family
Campanulinidae
Campanulinidae is a family of cnidarians belonging to the order Leptomedusae.
Genera
Genera:
* ''Calycella (hydrozoan), Calycella'' Hincks in Allman, 1864
* ''Campanulina'' van Beneden, 1847
* ''Egmundella'' Stechow, 1921
* ''Gangiostoma'' Xu, ...
. The only species is ''Tetrapoma quadridentatum''.
The species is found in America and Arctic regions.
References
Campanulinidae
Hydrozoan genera
Monotypic cnidarian genera
{{Leptothecata-stub