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several of the presumed orders in each subclass is still in need of verification.

In any case, according to this classification, the hydrozoans can be subdivided as follows, with taxon names emended to end in "-ae":

Class Hydrozoa
* Subclass Hydroidolina
** Order Anthoathecata (= Anthoathecata(e), Athecata(e), Anthomedusae, Stylasterina(e)) -- includes Laingoimedusae but monophyly requires verification

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