Phaennidae is a family of planktonic copepods, found in pelagic or benthopelagic waters. In 2010, Bradford-Grieve and others gave a cladistic analysis placing it as a sister clade to the family Tharybidae.
It contains the following genera: Brachycalanus Farran, 1905 Cephalophanes Sars, 1907 Cornucalanus Wolfenden, 1905 Kirnesius Markhaseva & Semenova, 2005 Onchocalanus Sars, 1905 Phaenna Claus, 1863 Phaennocalanus Markhaseva, 2002 Talacalanus Wolfenden, 1911 Xanthocalanus Giesbrecht, 1892
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