Hydractinia è un genere di Hydrozoa della famiglia Hydractiniidae.
Specie Hydractinia aculeata Hydractinia aggregata () Hydractinia allmani Hydractinia altispina Hydractinia americana () Hydractinia angusta Hydractinia apicata Hydractinia arctica Hydractinia areolata Hydractinia arge () Hydractinia armata () Hydractinia australis Hydractinia bayeri Hydractinia bella Hydractinia betkensis Hydractinia borealis Hydractinia brachyurae Hydractinia calderi Hydractinia californica () Hydractinia canalifera Hydractinia carcinicola Hydractinia carica () Hydractinia carnea () Hydractinia carolinae () Hydractinia claviformis Hydractinia conchicola Hydractinia cryptoconcha Hydractinia cryptogonia Hydractinia cytaciformis Hydractinia dendritica Hydractinia diogenes Hydractinia disjuncta Hydractinia dubia () Hydractinia echinata () Hydractinia epiconcha Hydractinia epispongia Hydractinia exigua Hydractinia fucicola () Hydractinia granulata Hydractinia hancocki Hydractinia hayamaensis Hydractinia hooperii (Sigerfoos, 1899) Hydractinia humilis Hydractinia inabai Hydractinia inermis Hydractinia ingolfi Hydractinia kaffaria Hydractinia laevispina (Fraser, 1922) Hydractinia longispina Hydractinia mar Hydractinia marsupialia Hydractinia meteoris Hydractinia milleri () Hydractinia minima () Hydractinia minoi Hydractinia minuta () Hydractinia misakinensis Hydractinia monocarpa () Hydractinia monoon Hydractinia multigranosi Hydractinia multispina () Hydractinia multitentaculata Hydractinia nassa Hydractinia novaezelandiae Hydractinia ocellata Hydractinia otagoensis Hydractinia pacifica Hydractinia parvispina () Hydractinia paucispinata Hydractinia piscicola Hydractinia polycarpa () Hydractinia polyclina () Hydractinia polystyla Hydractinia proboscidea Hydractinia prolifica () Hydractinia pruvoti Hydractinia quadrigemina Hydractinia reticulata Hydractinia reticulata Hydractinia rubricata Hydractinia rugosa Hydractinia sarsi Hydractinia selena () Hydractinia serrata Hydractinia sodalis Hydractinia spinipapillaris Hydractinia spiralis Hydractinia symbiolongicarpus () Hydractinia symbiopollicaris () Hydractinia tenuis Hydractinia thatcheri Hydractinia uchidai Hydractinia uniformis Hydractinia valens () Hydractinia vallini Hydractinia yerii
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Categoria:Anthoathecata Categoria:Taxa descritti nel 1841