ventrata ventrata ventrata is an infraphylum of ciliates inside the subphylum intramacronucleata that unites the classes phyllopharyngea, colpodea, nassophorea, prostomatea, plagiopylea and oligohymenophorea. it is equivalent to the clade conthreep or conthreep recovered by phylogenetic analyses. ventrata paramecium caudatum scientific classification domain: eukaryota clade: diaphoretickes clade: tsar clade: sar clade: alveolata phylum: ciliophora subphylum: intramacronucleata infraphylum: ventratacavalier-smith 2004 classes phyllopharyngea colpodea nassophorea prostomatea plagiopylea oligohymenophorea wikispecies has information related to ventrata. wikimedia commons has media related to ventrata. description members of this taxon are characterized by having, ancestrally, a ventral cytopharynx, as the name suggests. phylogeny the monophyly of conthreep is well supported, being placed as sister to protocruziea. the order discotrichida, belonging to class nassophorea, has been recovered as the earliest branch of the clade. protocruziea ventrata discotrichida (nassophorea) colpodea nassophorea phyllopharyngea oligohymenophorea prostomatea plagiopylea conthreep