Mormonillidae is a family of planktonic marine copepods, the only member of the order Mormonilloida. There are five known species in two genera:
*Mormonilla atlantica <small>Wolfenden, 1905</small>
*Mormonilla phasma <small>Giesbrecht, 1891</small>
*Neomormonilla extremata <small>Ivanenko & Defaye, 2006</small>
*Neomormonilla minor <small>(Giesbrecht, 1891)</small>
*Neomormonilla polaris <small>(G. O. Sars, 1900)</small>
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