Zyzzyzus is a genus of marine tubulariid hydrozoans, which grow embedded in sponges.
Species Zyzzyzus floridanus Petersen, 1990 Zyzzyzus iyoensis (Yamada, 1959) Zyzzyzus parvula (Hickson & Gravely, 1907) Zyzzyzus robustus Petersen, 1990 Zyzzyzus rubusidaeus Brinckmann-Voss & Calder, 2013 Zyzzyzus spongicolus (von Lendenfeld, 1884) Zyzzyzus warreni Calder, 1988
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