Westblad, E., 1947. Notes on hydroids. Ark. Zool., Stockholm -39 5: 1-23. [details]
basis of record
Bouillon, J.; Gravili, C.; Pagès, F.; Gili, J.-M.; Boero, F. (2006). An introduction to Hydrozoa. Mémoires du Muséum national d'Histoire naturelle, 194. Muséum national d'Histoire naturelle: Paris, France. ISBN 2-85653-580-1. 591 + 1 cd-rom pp. (look up in IMIS) [details]
From editor or global species database
Diagnosis Medusa umbrella evenly rounded with thick apical jelly; manubrium half as long as bell cavity, with or without broad, dome-shaped apical chamber; mouth simple, with ring of nematocysts; gonad forming thick ring around manubrium; four narrow radial canals
and narrow ring canal; four marginal bulbs each with a solid tentacle terminating in ovoid knob studded with nematocysts. No ocelli.
Hydroids solitary, small, with one whorl of reduced tentacles, capitate or not, located in the oral or median part of column; perisarc covering of base filmy or absent; gametes in body wall. [details]