Hydrozoa | Anthoathecata
Environment / Climate / Range
Pelagic; depth range 0 - 5 m (Ref. 116013). Polar
Arctic, Western Atlantic and Eastern Pacific. Mostly polar, but also subtropical and boreal.
Length at first maturity / Size / Weight / Age
Maturity: Lm ?  range ? - ? cm Max length : 0.9 cm WD male/unsexed; (Ref. 2992)
Bell measures 10 mm high and wide; manubrium varies from pink to white, with 4 very distinctive dichotomously-branched oral tentacles; 4 radial canals; 4 tentacle bulbs, each bearing similar tentacles (<60) and with its own dark ocellus; transparent umbrella (Ref. 2376).
Found on bay and nearshore (Ref. 116013). Colonial (Ref. 19). Fairly short-lived, occurring in late spring or summer and feeding especially on barnacle nauplii; preyed on by Aequorea and other medusivorous hydromedusae (Ref. 2376). Also on hard substrate (Ref. 116013). Species exhibits both asexual and sexual reproduction by budding during hydroid stage and release of gametes in medusae stages (Ref. 1663, p. 12, 16).
Life cycle and mating behavior
Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae
Species exhibits both asexual and sexual reproduction by budding during hydroid stage and release of gametes in medusae stages (Ref. 1663, p. 12, 16).
Cairns, S.D., D.R. Calder, A. Brinckmann-Voss, C.B. Castro, D.G. Fautin, P.R. Pugh, C.E. Mills, W.C. Jaap, M.N. Arai, S.H.D. Haddock and D.M. Opresko. 2003. (Ref. 1663)
IUCN Red List Status (Ref. 115185)
CITES status (Ref. 108899)
Threat to humans
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Estimates of some properties based on models
Low vulnerability (10 of 100)