Hydrozoa | Anthoathecata
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)
Size / Weight / Age
Max length : 0.9 cm WD male/unsexed; (Ref. 2992)
Climate / Range
Arctic, Western Atlantic and Eastern Pacific. Mostly polar, but also subtropical and boreal.
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).
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). Species exhibits both asexual and sexual reproduction by budding during hydroid stage and release of gametes in medusae stages (Ref. 1663, p. 12, 16).
IUCN Red List Status (Ref. 114614)
CITES status (Ref. 94142)
Threat to humans
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Estimation of some characteristics with mathematical models
Low vulnerability (10 of 100)