rhynchocystinae rhynchocystinae the rhynchocystinae are a subfamily of parasites in the phylum apicomplexa. rhynchocystinae scientific classification domain: eukaryota (unranked): sar (unranked): alveolata phylum: apicomplexa class: conoidasida subclass: gregarinasina order: eugregarinorida suborder: aseptatorina family: monocystidae subfamily: rhynchocystinae genera dirhynchocystis grayallia rhynchocystis taxonomy there are three genera in this subfamily: dirhynchocystis, grayallia and rhynchocystis. history this subfamily was created by bhatia and stena in 1939. description