Hydrozoa note details
Hydroid forming stolonal colonies; hydrocaulus short to moderately long, simple, arising from a hydrorhiza embedded in tissue of host sponge; perisarc thin, covering both the hydrorhiza and the hydrocaulus; hydranth slightly pyriform, with dicapitate tentacles in one or two alternating whorls around broadest part of the body; hypostome proboscis-like, contractile; gonophores developing among tentacles on short blastostyles. Medusa stage: newly liberated medusae with bell-shaped umbrella and scattered nematocysts on exumbrella; four tentacular bulbs, two of which bear an opposite tentacle, with a terminal spherical knob of nematocysts; manubrium cylindrical, with circular mouth. Adults unknown
Maggioni, D.; Galli, P.; Berumen, M. L.; Arrigoni, R.; Seveso, D.; Montano, S. (2017). Astrocoryne cabela, gen. nov. et sp. nov. (Hydrozoa : Sphaerocorynidae), a new sponge-associated hydrozoan. Invertebrate Systematics. 31(6): 734-746.