Paramecium or paramecia are single-celled protists that are naturally found in aquatic habitats. They are typically oblong or slipper-shaped and are covered with short hairy structures called ...

Mating types have been found in four species of Paramecium, in addition to the two previously reported: in P. trichium and P. calkinsi, by Sonneborn, and in P. multimicronucleatum and P. caudatum, by ...