choano-, choan- +

(Greek: funnel; a combining form denoting a relationship to a funnel or to a funnel-like structure)

choanate
Possessing a funnel-like opening, or infundibulum.
choanocyte
One of the cells that line the flagellated chambers of sponges, also found in some protozoa.
choanoflagellate
A protozoon belonging to the order Choanoflagellida, marked by a collar at the base of the flagellum; collared flagellate.
choanoid
Funnel-shaped.