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