Acleistoceras Hyatt, 1883 † (original description)
Actinoceras (Deiroceras) Hyatt, 1884 † accepted as Deiroceras Hyatt, 1884 † (original description)
Actinoceras (Deiroceras) python (Billings, 1857) † accepted as Deiroceras python (Billings, 1857) † (basis of record)
Aphelaeceras Hyatt, 1884 † (original description)
Aphelaeceras disciforme (Meek & Worthen, 1865) † (basis of record)
Apsidoceras Hyatt, 1884 † (original description)
Apsidoceratidae Hyatt, 1884 † (original description)
Bactritidae Hyatt, 1884 † (original description)
Barrandeoceras Hyatt, 1884 † (original description)
Barrandeoceras bohemicum (Barrande, 1854) † accepted as Boionautilus bohemicus (Barrande, 1854) † (basis of record)
Barrandeoceras natator (Billings, 1859) † (basis of record)
Barrandeoceras sacheri (Barrande, 1865) † accepted as Boionautilus sacheri (Barrande, 1865) † (basis of record)
Barrandeoceras sternbergi (Barrande, 1865) † accepted as Cumingsoceras sternbergi (Barrande, 1865) † (basis of record)
Barrandeoceras tyrannus (Barrande, 1865) † accepted as Boionautilus tyrannus (Barrande, 1865) † (basis of record)
Billingsites Hyatt, 1884 † (original description)
Cenoceras Hyatt, 1883 † (original description)
Cranoceras Hyatt, 1884 † (original description)
Cranoceras depressum (Bronn, 1835) † (basis of record)
Cymatoceras Hyatt, 1884 † (original description)
Cyrtocera depressa Bronn, 1835 † accepted as Cranoceras depressum (Bronn, 1835) † (new combination reference)
Cyrtoceras jason J. Hall, 1879 † accepted as Rutoceras jason (J. Hall, 1879) † (new combination reference)
Cyrtoceras syphax Billings, 1865 † accepted as Eremoceras syphax (Billings, 1865) † (new combination reference)
Cyrtoceras uranus Barrande, 1866 † accepted as Uranoceras uranus (Barrande, 1866) † (new combination reference)
Dawsonoceras Hyatt, 1884 † (original description)
Diadiploceras Hyatt, 1883 † (original description)
Discites McCoy, 1844 † accepted as Discitoceras Hyatt, 1884 † (replacement name source)
Discites harttii (J. W. Dawson, 1868) † accepted as Stroboceras harttii (J. W. Dawson, 1868) † (new combination reference)
Discitoceras Hyatt, 1884 † (original description)
Edaphoceras Hyatt, 1884 † (original description)
Edaphoceras niotense (Meek & Worthen, 1865) † (basis of record)
Enclimatoceras Hyatt, 1883 † (original description)
Endoceras multitubulatum J. Hall, 1847 † accepted as Vaginoceras multitubulatum (J. Hall, 1847) † (new combination reference)
Endoceratidae Hyatt, 1884 † (original description)
Endolobus avonensis (J. W. Dawson, 1868) † accepted as Diodoceras avonense (J. W. Dawson, 1868) † (basis of record)
Geisonoceras Hyatt, 1884 † (original description)
Grypoceras Hyatt, 1884 † (original description)
Gyroceras harttii J. W. Dawson, 1868 † accepted as Stroboceras harttii (J. W. Dawson, 1868) † (new combination reference)
Hercoceratidae Hyatt, 1884 † (original description)
Hexameroceras Hyatt, 1883 † (original description)
Kionoceras Hyatt, 1884 † (original description)
Kionoceras doricum (Barrande, 1868) † (basis of record)
Koninckioceras Hyatt, 1884 † (original description)
Litoceras Hyatt, 1883 † (original description)
Maelonoceras Hyatt, 1884 † (original description)
Maelonoceras praematurum (Billings, 1860) † (basis of record)
Metacoceras Hyatt, 1884 † (original description)
Metacoceras sangamonense (F. B. Meek & Worthen, 1861) † (basis of record)
Mojsvaroceras Hyatt, 1884 † (original description)
Mojsvaroceras neumayeri [sic] † accepted as Mojsvaroceras neumayri (Mojsisovics, 1882) † (basis of record)
Mojsvaroceras neumayri (Mojsisovics, 1882) † (basis of record)
Nautilus (Discites) disciformis Meek & Worthen, 1865 † accepted as Aphelaeceras disciforme (Meek & Worthen, 1865) † (new combination reference)
Nautilus (Temnocheilus) niotensis Meek & Worthen, 1865 † accepted as Edaphoceras niotense (Meek & Worthen, 1865) † (new combination reference)
Nautilus gemmatus Mojsisovics, 1873 † accepted as Phloioceras gemmatum (Mojsisovics, 1873) † (new combination reference)
Nautilus jason Billings, 1859 † accepted as Plectoceras jason (Billings, 1859) † (new combination reference)
Nautilus natator Billings, 1859 † accepted as Barrandeoceras natator (Billings, 1859) † (new combination reference)
Nautilus ophioneus W. Waagen, 1879 † accepted as Pselioceras ophioneum (W. Waagen, 1879) † (new combination reference)
Nautilus oxystomus J. Phillips, 1836 † accepted as Phacoceras oxystomum (J. Phillips, 1836) † (new combination reference)
Nautilus ponderosus M. S. White, 1872 † accepted as Titanoceras ponderosum (M. S. White, 1872) † (new combination reference)
Nautilus quadrangulus McChesney, 1859 † accepted as Tainoceras quadrangulum (McChesney, 1859) † (new combination reference)
Nautilus sangamonensis F. B. Meek & Worthen, 1861 † accepted as Metacoceras sangamonense (F. B. Meek & Worthen, 1861) † (new combination reference)
Oncoceratidae Hyatt, 1884 † (original description)
Orthoceras crotalum J. Hall, 1879 † accepted as Spyroceras crotalum (J. Hall, 1879) † (new combination reference)
Orthoceras doricum Barrande, 1868 † accepted as Kionoceras doricum (Barrande, 1868) † (new combination reference)
Orthoceras indocile Barrande, 1866 † accepted as Rizosceras indocile (Barrande, 1866) † (additional source)
Orthoceras python Billings, 1857 † accepted as Deiroceras python (Billings, 1857) † (new combination reference)
Orthoceras richteri Barrande, 1868 † accepted as Sactoceras richteri (Barrande, 1868) † (new combination reference)
Pentameroceras Hyatt, 1883 † (original description)
Phacoceras Hyatt, 1884 † (original description)
Phacoceras oxystomum (J. Phillips, 1836) † (basis of record)
Phloioceras Hyatt, 1884 † (original description)
Phloioceras gemmatum (Mojsisovics, 1873) † (basis of record)
Phragmoceras praematurum Billings, 1860 † accepted as Maelonoceras praematurum (Billings, 1860) † (new combination reference)
Plectoceras Hyatt, 1884 † (original description)
Plectoceras jason (Billings, 1859) † (basis of record)
Pselioceras Hyatt, 1884 † (original description)
Pselioceras ophioneum (W. Waagen, 1879) † (basis of record)
Rizosceras Hyatt, 1883 † (original description)
Rutoceras Hyatt, 1884 † (original description)
Rutoceras jason (J. Hall, 1879) † (basis of record)
Rutoceratidae Hyatt, 1884 † (original description)
Sactoceras Hyatt, 1884 † (original description)
Sactoceras richteri (Barrande, 1868) † (basis of record)
Solenoceras Hyatt, 1884 † accepted as Coelogasteroceras Hyatt, 1893 † (original description)
Solenoceras canaliculatum (E. T. Cox, 1857) † accepted as Coelogasteroceras coxi M. Gordon, 1960 † (basis of record)
Spyroceras Hyatt, 1884 † (original description)
Spyroceras crotalum (J. Hall, 1879) † (basis of record)
Stroboceras Hyatt, 1884 † (original description)
Stroboceras hartii [sic] † accepted as Stroboceras harttii (J. W. Dawson, 1868) † (basis of record)
Stroboceras harttii (J. W. Dawson, 1868) † (basis of record)
Tainoceras Hyatt, 1884 † (original description)
Tainoceras quadrangulum (McChesney, 1859) † (basis of record)
Tainoceratidae Hyatt, 1884 † (original description)
Temnocheilus neumayri Mojsisovics, 1882 † accepted as Mojsvaroceras neumayri (Mojsisovics, 1882) † (new combination reference)
Tetrameroceras Hyatt, 1883 † (original description)
Titanoceras Hyatt, 1884 † (original description)
Titanoceras ponderosum (M. S. White, 1872) † (basis of record)
Trematodiscus gemmatus (Mojsisovics, 1873) † accepted as Phloioceras gemmatum (Mojsisovics, 1873) † (new combination reference)
Triboloceratidae Hyatt, 1884 † accepted as Trigonoceratidae Hyatt, 1884 † (original description)
Trigonoceratidae Hyatt, 1884 † (original description)
Trimeroceras Hyatt, 1883 † (original description)

 Etymology

 for Zittelloceras Hyatt, 1884 †

Dedicated to Prof. Karl Zittel of Munich [details]

 Etymology note

 for Zittelloceras Hyatt, 1884 †

The genus was explicitly "dedicated to Prof. Karl Zittel of Munich" (Hyatt 1884, p. 284). Thus, "Zittelloceras" is ... [details]