Meaning of choanoflagellate

cho•a•no•flag•el•late

Pronunciation: (kō"u-nō-flaj'u-lāt"), [key]
— n. Zool.
  1. any flagellate of the genera Monosiga and Proterospongia, having a protoplasmic collar encircling the base of the flagellum.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.