No mouth; 1 or 2 flagella: amoeboid Family _Rhizomastigidæ_
with lobose or ray-like pseudopodia
Mouth at base of single flagellum; Family _Cercomonadidæ_
plastic; no pseudopodia
One flagellum; inclosed in gelatinous Family _Codonoecidæ_
or membranous cups
One flagellum; tentacle like process Family _Bikoecidæ_
at base of flagellum; inclosed in cup
One main flagellum and 1 or 2 Family _Heteromonadidæ_
accessory flagella