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Mollusca (132 851)
Subphylum Aculifera
Subphylum Conchifera
Subphylum Placophora accepted as Polyplacophora
Superclass Aplacophora
Class Amphineura accepted as Aculifera
Class Bivalvia (25 013)
Class Caudofoveata (143)
Class Cephalopoda (1 834)
Class Conchifera accepted as Bivalvia
Class Cricoconarida † (1)
Class Gastropoda (102 753)
Class Lamellibranchiata accepted as Bivalvia
Class Loricata accepted as Polyplacophora
Class Mollusca incertae sedis † (372)
Class Monoplacophora (229)
Subclass Tergomya † (34)
Order Cyrtonellida † (4)
Order Monoplacophora incertae sedis (1)
Order Multifariida † accepted as Cyclocyrtonelloidae Horný, 1962 †
Order Neopilinida (31)
Order Sinuitopsida † (81)
Superfamily Cyclocyrtonelloidae Horný, 1962 † (30)
Superfamily Cyrtolitoidea S. A. Miller, 1889 † (51)
Family Carcassonnellidae Horný, 1997 † (13)
Family Cyrtolitidae S. A. Miller, 1889 † (38)
Subfamily Carcassonnellinae Horný, 1997 † accepted as Carcassonnellidae Horný, 1997 †
Genus Cloudia Knight, 1947 † (1)
Genus Cyrtolites Conrad, 1838 † (23)
Subgenus Cyrtolites (Cyrtolites) Conrad, 1838 † accepted as Cyrtolites Conrad, 1838 †
Subgenus Cyrtolites (Paracyrtolites) Wahlman, 1992 † accepted as Paracyrtolites Wahlman, 1992 †
Species Cyrtolites acutus Barrande, 1903 † accepted as Temnodiscus bicarinatus Perner, 1903 †
Species Cyrtolites advena Barrande, 1903 † accepted as Neocyrtolites advena (Barrande, 1903) †
Species Cyrtolites arrosus Lindström, 1884 †
Species Cyrtolites budleighensis Reed, 1921 †
Species Cyrtolites carinatus S. A. Miller, 1874 † accepted as Paracyrtolites carinatus (S. A. Miller, 1874) †
Species Cyrtolites claysferryensis Wahlman, 1992 †
Species Cyrtolites conradi J. Hall, 1862 † accepted as Bucanella conradi (J. Hall, 1862) †
Species Cyrtolites corniculum Eichwald, 1860 † accepted as Pollicina corniculum (Eichwald, 1860) †
Species Cyrtolites craigensis Reed, 1921 †
Species Cyrtolites cristatus Safford, 1869 † accepted as Tropidodiscus cristatus (Safford, 1869) †
Species Cyrtolites decorus Perner, 1903 † accepted as Yochelsonellis decorus (Perner, 1903) †
Species Cyrtolites dilatus Ulrich & Scofield, 1897 †
Species Cyrtolites discus Lindström, 1884 †
Species Cyrtolites disjunctus Ulrich & Scofield, 1897 †
Species Cyrtolites eremita Barrande, 1903 † accepted as Cyclocyrtonella eremita (Barrande, 1903) †
Species Cyrtolites euryomphalus Lindström, 1884 †
Species Cyrtolites evolvens Barrande, 1903 † accepted as Cyrtodiscus evolvens (Barrande, 1903) †
Species Cyrtolites expansus J. Hall, 1859 † accepted as Cyrtonella expansa (J. Hall, 1859) †
Species Cyrtolites fallax Perner, 1903 † accepted as Yochelsonellis fallax (Perner, 1903) †
Species Cyrtolites fasciculatus Barrande, 1903 † accepted as Yochelsonellis fasciculatus (Barrande, 1903) †
Species Cyrtolites grandis Koken, 1897 †
Species Cyrtolites hornyi Wahlman, 1992 †
Species Cyrtolites inornatum (J. Hall, 1845) †
Species Cyrtolites inprobus Barrande, 1903 †
Species Cyrtolites insculptus Northrop, 1939 †
Species Cyrtolites kokeni Perner, 1903 † accepted as Yochelsonellis kokeni (Perner, 1903) †
Species Cyrtolites lamellifer Lindström, 1884 † accepted as Temnodiscus lamellifer (Lindström, 1884) †
Species Cyrtolites magnus S. A. Miller, 1878 † accepted as Tropidodiscus magnus (S. A. Miller, 1878) †
Species Cyrtolites minor Ulrich & Scofield, 1897 †
Species Cyrtolites mitella J. Hall, 1859 † accepted as Cyrtonella mitella (J. Hall, 1859) †
Species Cyrtolites nitidulus E. O. Ulrich, 1879 †
Species Cyrtolites nodosus Salter & Aveline, 1854 †
Species Cyrtolites obliquus Lindström, 1884 †
Species Cyrtolites occultus Perner, 1903 †
Species Cyrtolites orbiculus Lindström, 1884 †
Species Cyrtolites ornatus Conrad, 1838 †
Species Cyrtolites pachygaster Koken, 1925 † accepted as Cymbularia bullatus (Koken, 1925) †
Species Cyrtolites parvus Ulrich, 1897 † accepted as Paracyrtolites parvus (Ulrich, 1897) †
Species Cyrtolites pharetra Lindström, 1884 †
Species Cyrtolites pileolus J. Hall, 1859 †
Species Cyrtolites planicosta Perner, 1903 † accepted as Yochelsonellis planicosta (Perner, 1903) †
Species Cyrtolites retrorsus Ulrich & Scofield, 1897 †
Species Cyrtolites rugosus Barrande, 1903 †
Species Cyrtolites seminulum Barrande, 1903 †
Species Cyrtolites sinuosus J. Hall, 1879 †
Species Cyrtolites subplanus Ulrich, 1897 † accepted as Paracyrtolites subplanus (Ulrich, 1897) †
Species Cyrtolites thraivensis Reed, 1921 †
Species Cyrtolites trentonensis Conrad, 1842 †
Species Cyrtolites tuboides Barrande, 1903 †
Species Cyrtolites undulatus Perner, 1903 †
Genus Kepinospira Yu, 1961 †
Genus Kolihadiscus Horný, 1992 † (3)
Genus Microceras J. Hall, 1845 † accepted as Cyrtolites Conrad, 1838 †
Genus Neocyrtolites Horný, 1965 † (1)
Genus Paracyrtolites Wahlman, 1992 † (3)
Genus Quasisinuites Horný, 1997 † (1)
Genus Sinuitopsina Horný, 1997 † (1)
Genus Sinuitopsis Perner, 1903 † (5)
Subfamily Cyrtonellopsinae Horný, 1965 † accepted as Cyrtonellidae Knight & Yochelson, 1958 †
Order Tryblidiida † (78)
Class Pelecypoda accepted as Bivalvia
Class Polyplacophora (1 377)
Class Polyplaxiphora accepted as Polyplacophora
Class Rostroconchia † (64)
Class Scaphopoda (752)
Class Solenoconchia accepted as Scaphopoda
Class Solenogastres (313)
Subclass Chaetodermomorpha accepted as Caudofoveata