Prostomatea
Encyclopedia
Prostomatea is a class
Class (biology)
In biological classification, class is* a taxonomic rank. Other well-known ranks are life, domain, kingdom, phylum, order, family, genus, and species, with class fitting between phylum and order...

 of Ciliophora. It includes the genera Coleps
Coleps
It is a cell.Coleps is a genus of ciliated Prostomatea with barrel-shaped bodies. The can grow up to 250 micrometers in length, but are usually under 100 micrometers in their longest axis. Coleps can be taxonomically distinguished by the ornamentation of their ectoplasmic calcium carbonate...

and Pelagothrix.
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