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Differs from Oicomonadidae in a unilateral proboscidiform process next the flagellum; often thecate and stalked, forming branched colonies, like Choanoflagellates in habit.

Thecate; posterior end of cup drawn out into stalk; walls perforated for exit of tentacles Metacinetidæ d.

Naked or thecate; stalked or not; tentacles numerous, usually knobbed and all alike Acinetidæ f.

Thecate forms; the body is attached by a stalk to the cup; within the adoral zone is a ring of cilia.

Attached forms; thecate and athecate tentacles simple, one or two in number Urnulidæ c.