(Opisthocystis) (Opisthocystis) is a biological genus in the family Polycystididae and order Neoophora.
Opisthocystis abyssalis
Opisthocystis aleksandri
Opisthocystis angarensis
Opisthocystis bilobata
Opisthocystis campanulata
Opisthocystis cariottus
Opisthocystis curvistylus
Opisthocystis drobyshevae
Opisthocystis evdonini
Opisthocystis goettei
Opisthocystis hendelbergi
Opisthocystis humilistylus
Opisthocystis igori
Opisthocystis intersticialis
Opisthocystis joffei
Opisthocystis kornilorum
Opisthocystis kotikovae
Opisthocystis marinae
Opisthocystis meyeri
Opisthocystis multifidus
Opisthocystis novikovae
Opisthocystis novitzkyi
Opisthocystis octopropagostylus
Opisthocystis pedistylus
Opisthocystis riegeri
Opisthocystis sabussovi
Opisthocystis seehauseni
Opisthocystis selavinovae
Opisthocystis sokolovi
Opisthocystis stepashi
Opisthocystis sturmbaueri
Opisthocystis trifida
Opisthocystis trifidostylus
Opisthocystis umylinae
Opisthocystis votyakovi
Opisthocystis wilkei
Opisthocystis zerbstboroffkae
Acrorhynchides
Acrorhynchus
Alcha
Alchoides
Ametochus
Annalisella
Annulorhynchus
Antiboreorhynchus
Arrawarria
Austrorhynchus
Bermudorhynchus
Brachyrhynchoides
Brunetorhynchus
Cincturorhynchus
Danorhynchus
Djeziraia
Duplacrorhynchus
Duplexostylus
Fungorhynchus
Galapagorhynchus
Gallorhynchus
Gemelliclinus
Gyratricella
Gyratrix
Hawadlia
Koinocystella
Lagenopolycystis
Limipolycystis
Macrorhynchus
Megaloascos
Myobulla
Neopolycystis
Opisthocystis
Palladia
Papia
Parachrorhynchus
Paraustrorhynchus
Paulodora
Phonorhynchella
Phonorhynchoides
Phonorhynchopsis
Phonorhynchus
Polycystis
Porrocystis
Progyrator
Psammopolycystis
Pygmorhynchus
Rogneda
Sabulirhynchus
Scanorhynchus
Stradorhynchus
Syltorhynchus
Triaustrorhynchus
Typhlopolycystis
Yaquinaia