Diagnosis
provided by World Register of Marine Species
Colonial hydroids, branched or not, perisarc not ensheathing bases of tentacles; hydranth with one whorl of filiform tentacles; gonophores on specialized blastostyles replacing a hydranth, numerous, released as swimming ciliated sporosacs provided with one or two tentacle-like processes at their proximal end (tentaculoids).
Launert, E. & Gonçalves, M.L. (1969) 36. Balsaminaceae Flora de Moçambique Junta de Investigaçoes de Ultramar, Centro de Botanica Pages 15 - 16
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