a group of Protozoa, moving and ingesting food by long flagella (Gr. µaQTL, whip), usually few in number, and multiplying by fission, usually longitudinal, in the active condition. They were separated off from the rest of the old "Infusoria" by K. Diising, and subdivided by O. Biitschli and E. R. Lankester into (I) Flagellata, including Haemoflagellata (q.v.), (2) Dinoflagellata (q.v.) and Rhyncho = Cystoflagellata E. Haeckel (q.v.) = Rhynchoflagellata E. R. Lankester. The Mastigophora are frequently termed Flagellata or Flagellates.