original description
Fraser, C. M. 1924. Acaulis primarius Stimpson. - Transactions of the Royal Society of Canada, Sec. V. 173: 165-173. [details]
context source (Hexacorallia)
Fautin, Daphne G. (2013). Hexacorallians of the World. (look up in IMIS) [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 Hydroid solitary, body divided into basal and distal part. Basal part conical to cylindrical, covered or not by gelatinous perisarc which may form anchoring filaments. Distal part with tentacles, tentacles capitate or indistinctly capitate. Upper part of hydranth with one or two oral whorls of capitate tentacles and scattered capitate tentacles below; below capitate tentacles with or without one whorl of thick filiform tentacles Gonophores fixed sporosacs in the lower or middle part of the hydranth, sometimes with asexual reproduction by transverse fission [details]
From editor or global species database
