F. quadrangularis, [362]
Funiculinidae, [362]
Funnel, of Craspedomonadidae or Choanoflagellates, [111], [121], [122], [182];
of Phalausteridae, [111];
of choanocytes of Sponges, [171]
Fusion of larval Sponges, [174]
Fusion-nucleus of Ciliata, [150]
—see also Reproduction, Syngamy, Zygotonucleus
Fusulina, [59]