''Halecium'' is a genus of

hydrozoans 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 specialized ...

in the family

Haleciidae Haleciidae is a family of hydrozoans. Their hydroid colonies emerge from a creeping hydrorhiza and usually form upright branching colonies, although some species' colonies are stolonal. Their gonophores are typically sporosacs, growing singly ...

, consisting of approximately 120 species. These marine invertebrates are found in all oceans, where they often form large colonies.

References

Haleciidae Hydrozoan genera {{Leptothecata-stub