Nowhere to go?
Choanoflagellida: ancestors of sponges, phylogenetically unrelated to other protista
Amoebas: polyphyletic group of protists without rigid cell wall, heterotrophic
Foraminifera: perhaps relatives of amoebas, with snail-like shell of carbonate, marine
Radiolaria: perhaps relatives of amoebas, shell of silicate, marine
- plasmodial slime molds: one huge, multi-nucleated cell occurs as plasmodium
- cellular slime molds: amoebic cells can aggregate to plasmodium during unfavorable conditions to produce erect sporophytes