chonotrich chonotrich chonotrichia is a subclass of phyllopharyngeid ciliates. these single-celled organisms are sessile at maturity and usually live on crustaceans as ectosymbionts. chonotrich scientific classification domain: eukaryota clade: diaphoretickes clade: sar clade: alveolata phylum: ciliophora subphylum: intramacronucleata infraphylum: ventrata class: phyllopharyngea subclass: chonotrichiawallengren, 1895 order cryptogemmida exogemmida