abditum, Tibichoanoceras abditum (Balashov & Kiselev, 1968) † (FOSSIL)
aciculare, Orthoceras aciculare Brown, 1860 † (FOSSIL)
adrianense, Orthoceras adrianense Gemmellaro, 1889 † - syn of: Hemibactrites adrianense (Gemmellaro, 1889) † (FOSSIL)
affine, Orthoceras affine Meneghini, 1857 † - syn of: Arionoceras canonicum (Meneghini, 1843) † (FOSSIL)
agassizi, Orthoceras agassizi Barrande, 1866 † (FOSSIL)
alayense, Orthocycloceras alayense Barskov, 1972 † (FOSSIL)
albersi, Orthoceras albersi Miller & Faber, 1894 † - syn of: Isonema verae Frech, 1894 † (FOSSIL)
amplicameratum, Orthoceras amplicameratum Hall, 1847 † - syn of: Ordogeisonoceras amplicameratum (Hall, 1847) † (FOSSIL)
anellus, Orthoceras anellus Conrad, 1843 † (FOSSIL)
angustum, Orthoceras angustum Holzapfel, 1895 † (FOSSIL)
annulata, Orthoceras annulata (Sowerby, 1818) † (FOSSIL)
apperiens, Orthoceras apperiens Barrande, 1860 † - syn of: Sphooceras truncatum (Barrande, 1860) † (FOSSIL)
araneosum, Orthoceras araneosum Barrande, 1866 † (FOSSIL)
arcticum, Orthoceras arcticum Foord † - syn of: Offleyoceras arcticum Foord † (FOSSIL)
arion, Orthoceras arion Barrande, 1866 † - syn of: Arionoceras canonicum (Meneghini, 1843) † (FOSSIL)
attavus, Orthoceras attavus Brøgger, 1882 † - syn of: Slemmestadoceras attavus (Brøgger, 1882) † (FOSSIL)
atticus, Oxfordoceras atticus (Billings, 1865) † (FOSSIL)
austriacum, Trematoceras austriacum (von Mojsisovics, 1873) † (FOSSIL)
austriacum, Orthoceras austriacum von Mojsisovics, 1873 † - syn of: Trematoceras austriacum (von Mojsisovics, 1873) † (FOSSIL)
avelinii, Orthoceras avelinii Salter, 1854 † - syn of: Michelinoceras avelinii (Salter, 1854) † (FOSSIL)
baculiforme, Orthoceras baculiforme Salter † (FOSSIL)
barrandei, Orthoceras barrandei Salter † (FOSSIL)
barumense, Orthoceras barumense Whidborne † (FOSSIL)
bellatulum, Orthoceras bellatulum Billings, 1866 † - syn of: Kionoceras virgatum (Sowerby & Murchison, 1839) † (FOSSIL)
bicinctum, Orthoceras bicinctum Abich, 1878 † - syn of: Lopingoceras bicinctum (Abich, 1878) † (FOSSIL)
bifoveatum, Orthoceras bifoveatum Noetling, 1879 † (FOSSIL)
bilineatum, Orthoceras bilineatum Hall † (FOSSIL)
billingsi, Oxfordoceras billingsi Ulrich & al., 1944 † (FOSSIL)
bisignatum, Orthoceras bisignatum Barrande, 1877 † (FOSSIL)
blakei, Orthoceras blakei Gabb, 1864 † (FOSSIL)
bohemicum, Orthoceras bohemicum Barrande, 1866 † - syn of: Orthoceras fluminense (Meneghini, 1857) † (FOSSIL)
breviconum, Orthoceras breviconum Portlock, 1843 † - syn of: Diestoceras breviconum (Portlock, 1843) † (FOSSIL)
brevimira, Infundibuloceras brevimira Klug & al., 2008 † (FOSSIL)
burgense, Orthoceras burgense Gemmellaro, 1889 † (FOSSIL)
buttsi, Palorthoceras buttsi (Flower, 1962) † (FOSSIL)
caereesiense, Orthoceras caereesiense Hicks, 1875 † - syn of: Michelinoceras avelinii (Salter, 1854) † (FOSSIL)
calamus, Orthoceras calamus de Koninck † (FOSSIL)
campanile, Trematoceras campanile Mojsisovics, 1869 † - syn of: Michelinoceras campanile (Mojsisovics, 1869) † (FOSSIL)
campanile, Orthoceras campanile Mojsisovics, 1869 † - syn of: Michelinoceras campanile (Mojsisovics, 1869) † (FOSSIL)
canaliculatum, Orthoceras canaliculatum Sowerby & Murchison, 1839 † - syn of: Kionoceras virgatum (Sowerby & Murchison, 1839) † (FOSSIL)
cardiolae, Orthoceras cardiolae Gurich, 1896 † - syn of: Plagiostomoceras cardiolae (Gurich, 1896) † (FOSSIL)
cataline, Orthoceras cataline Billings, 1865 † - syn of: Ectocycloceras cataline (Billings, 1865) † (FOSSIL)
cato, Orthoceras cato Billings, 1865 † - syn of: Ectocycloceras cato (Billings, 1865) † (FOSSIL)
catulus, Orthoceras catulus Billings, 1865 † - syn of: Protocycloceras catulus (Billings, 1865) † (FOSSIL)
celticum, Trematoceras celticum (von Mojsisovics, 1873) † (FOSSIL)
celticum, Orthoceras celticum von Mojsisovics, 1873 † - syn of: Trematoceras celticum (von Mojsisovics, 1873) † (FOSSIL)
centrale, Orthoceras centrale Hisinger, 1837 † - syn of: Nilssonoceras nilssoni (Boll, 1857) † (FOSSIL)
champernowni, Orthoceras champernowni Whidborne † (FOSSIL)
coralliformis, Orthoceras coralliformis M'Coy, 1846 † - syn of: Kionoceras coralliforme (M'Coy, 1846) † (FOSSIL)
coreanicum, Orthoceras coreanicum Kobayashi, 1927 † - syn of: Holmiceras coreanicum (Kobayashi, 1927) † (FOSSIL)
crebriliratum, Orthoceras crebriliratum Girty, 1909 † - syn of: Mitorthoceras crebriliratum (Girty, 1909) † (FOSSIL)
cribrosum, Orthoceras cribrosum Geinitz, 1866 † - syn of: Pseudorthoceras knoxense (McChesney, 1859) † (FOSSIL)
cuvieri, Orthoceras cuvieri Barrande, 1868 † (FOSSIL)
cyclophorum, Orthoceras cyclophorum Waagen, 1879 † - syn of: Brachycycloceras cyclophorum (Waagen, 1879) † (FOSSIL)
dahlii, Orthoceras dahlii Barrande, 1870 † - syn of: Temperoceras ludense (Sowerby, 1839) † (FOSSIL)
davidsoni, Orthoceras davidsoni Barrande, 1870 † - syn of: Angeisonoceras davidsoni (Barrande, 1870) † (FOSSIL)
decipiens, Orthoceras decipiens Barrande, 1866 † (FOSSIL)
declivis, Merocycloceras declivis Ristedt, 1968 † (FOSSIL)
decrescens, Orthoceras decrescens de Koninck, 1863 † (FOSSIL)
disjunctum, Orthoceras disjunctum Barrande, 1868 † - syn of: Sphooceras disjunctum (Barrande, 1860) † (FOSSIL)
docens, Orthoceras docens Barrande, 1868 † (FOSSIL)
dominans, Orthoceras dominans De Gregorio, 1930 † (FOSSIL)
dorsatoides, Kopaninoceras dorsatoides Kröger, 2008 † (FOSSIL)
dubium, Trematoceras dubium (Hauer, 1847) † (FOSSIL)
duplex, Orthoceras duplex Wahlenberg, 1821 † - syn of: Proterovaginoceras incognitum (Schröder, 1882) † (FOSSIL)
eductum, Orthoceras vicarii eductum Whidborne (FOSSIL)
elegans, Trematoceras elegans (Munster, 1841) † (FOSSIL)
elegantulum, Orthoceras elegantulum Gemmellaro, 1889 † (FOSSIL)
eoum, Orthoceras eoum Blake, 1882 † - syn of: Polymeres demetarum Murchison, 1839 † (FOSSIL)
erectum, Copiceras erectum Ulrich & al., 1944 † (FOSSIL)
erfoudense, Chebbioceras erfoudense Klug & al., 2008 † (FOSSIL)
etheridgei, Orthoceras etheridgei Blake † (FOSSIL)
eutrichum, Orthoceras eutrichum Whidborne † (FOSSIL)
evanescens, Orthoceras evanescens Barrande, 1866 † (FOSSIL)
exoticum, Orthoceras exoticum Barrande, 1866 † (FOSSIL)
expansum, Orthoceras expansum Blake, 1882 † (FOSSIL)
filondouzense, Theoceras filondouzense Kröger, 2008 † (FOSSIL)
floweri, Pojetoceras floweri Frey, 1995 † (FOSSIL)
fluctuatum, Orthoceras fluctuatum Salter † (FOSSIL)
fluminense, Orthoceras fluminense (Meneghini, 1857) † (FOSSIL)
fluminense, Orthocycloceras fluminense Meneghini, 1857 † - syn of: Orthoceras fluminense (Meneghini, 1857) † (FOSSIL)
fluminese, Orthoceras fluminese Meneghini, 1857 † - syn of: Arionoceras fluminese (Meneghini, 1857) † (FOSSIL)
fluminese, Orthocycloceras fluminese Meneghini, 1857 † - syn of: Arionoceras fluminese (Meneghini, 1857) † (FOSSIL)
foerstei, Striatocycloceras foerstei (Teichert, 1930) † (FOSSIL)
ganimedes, Orthoceras ganimedes Barrande, 1866 † (FOSSIL)
geinitzi, Orthoceras geinitzi D'Orbigny, 1850 † (FOSSIL)
gracile, Orthoceras gracile Portlock, 1843 † - syn of: Gorbyoceras gracile (Portlock, 1843) † (FOSSIL)
gracile, Ogygoceras gracile Ulrich & al., 1944 † (FOSSIL)
gradatum, Orthoceras gradatum Gemmellaro, 1889 † (FOSSIL)
grindrodi, Orthoceras grindrodi Blake, 1882 † (FOSSIL)
guadalupense, Orthoceras guadalupense Girty, 1909 † - syn of: Michelinoceras guadalupense (Girty, 1909) † (FOSSIL)
henrietta, Orthoceras henrietta Dwight, 1884 † - syn of: Vassaroceras henrietta (Dwight, 1884) † (FOSSIL)
hindei, Orthoceras hindei James, 1878 † - syn of: Treptoceras transversum (Miller, 1875) † (FOSSIL)
hulli, Orthoceras hulli Gemmellaro, 1889 † (FOSSIL)
hungaricum, Orthoceras hungaricum Blake † (FOSSIL)
infelix, Orthoceras infelix Billings, 1866 † - syn of: Discosorus infelix (Billings, 1866) † (FOSSIL)
isbergi, Striatocycloceras isbergi Kröger, 2013 † (FOSSIL)
jucundum, Kopaninoceras jucundum (Barrande, 1870) † (FOSSIL)
junceum, Orthoceras junceum Hall, 1847 † - syn of: Isorthoceras heroyense (Strand, 1934) † (FOSSIL)
kawasakii, Orthoceras kawasakii Kobayashi, 1928 † (FOSSIL)
kayseri, Palorthoceras kayseri Kröger & al., 2007 † (FOSSIL)
komiense, Infundibuloceras komiense (Zhuravleva, 1978) † (FOSSIL)
lambi, Orthoceras lambi Whiteaves † (FOSSIL)
lateseptatum, Trematoceras lateseptatum (Hauer, 1846) † (FOSSIL)
lateseptatum, Orthoceras lateseptatum Hauer, 1846 † - syn of: Trematoceras lateseptatum (Hauer, 1846) † (FOSSIL)
latissimum, Orthoceras latissimum Portlock † (FOSSIL)
lentum, Orthoceras lentum Ruedemann, 1906 † (FOSSIL)
lepton, Orthoceras lepton Gemmellaro, 1889 † (FOSSIL)
lesueuri, Orthoceras lesueuri Clarke, 1897 † (FOSSIL)
longicameratum, Infundibuloceras longicameratum Kröger, 2008 † (FOSSIL)
lopingense, Orthoceras lopingense Stoyanow, 1910 † - syn of: Lopingoceras lopingense (Stoyanow, 1910) † (FOSSIL)
ludense, Orthoceras ludense Sowerby, 1839 † - syn of: Temperoceras ludense (Sowerby, 1839) † (FOSSIL)
ludense granulatum, Orthoceras ludense granulatum Sowerby † - syn of: Temperoceras ludense granulatum Straw † (FOSSIL)
ludlowense, Orthoceras ludlowense Hall, 1847 † - syn of: Ordogeisonoceras amplicameratum (Hall, 1847) † (FOSSIL)
luhai, Orthoceras luhai Stumbur, 1956 † (FOSSIL)
magnisulcatum, Orthoceras magnisulcatum Billings, 1857 † - syn of: Kionoceras magnisulcatum (Billings, 1857) † (FOSSIL)
makkolense, Orthoceras makkolense Kobayashi, 1927 † - syn of: Sactorthoceras makkolense (Kobayashi, 1927) † (FOSSIL)
mira, Infundibuloceras mira (Zhuravleva, 1978) † (FOSSIL)
modestum, Orthoceras modestum Ruedemann, 1906 † (FOSSIL)
mohamadi, Infundibuloceras mohamadi Kröger, 2008 † (FOSSIL)
multiannulatum, Orthoceras multiannulatum McCoy, 1851 † - syn of: Cycloceras multiannulatum (McCoy, 1851) † (FOSSIL)
nakamurai, Orthoceras nakamurai Kobayashi, 1927 † (FOSSIL)
nicolleti, Orthoceras nicolleti Clarke † (FOSSIL)
niissoni, Orthoceras niissoni Boll, 1857 † (FOSSIL)
nilssoni, Orthoceras nilssoni Boll, 1857 † - syn of: Nilssonoceras nilssoni (Boll, 1857) † (FOSSIL)
novator, Orthoceras novator Barrande, 1868 † (FOSSIL)
obliqueannulatum, Orthoceras obliqueannulatum Waagen, 1879 † - syn of: Neocycloceras obliqueannulatum (Waagen, 1879) † (FOSSIL)
obliquesulcatum, Orthoceras obliquesulcatum Gemmellaro, 1889 † - syn of: Ctenobactrites obliquesulcatus (Gemmellaro, 1889) † (FOSSIL)
obliquum, Striatocycloceras obliquum (d'Eichwald, 1860) † (FOSSIL)
oehlerti, Orthoceras oehlerti Gemmellaro, 1889 † (FOSSIL)
omnium, Orthoceras omnium Barrande, 1868 † - syn of: Temperoceras ludense (Sowerby, 1839) † (FOSSIL)
orientale, Orthoceras orientale Fliegel, 1901 † (FOSSIL)
ortoni, Orthoceras ortoni Meek, 1872 † - syn of: Westonoceras ortoni (Meek, 1872) † (FOSSIL)
oryx, Orthoceras oryx Whidborne † (FOSSIL)
oweni, Orthoceras oweni Ulrich, 1894 † (FOSSIL)
paternoi, Orthoceras paternoi Gemmellaro, 1889 † - syn of: Sicilioceras paternoi (Gemmellaro, 1889) † (FOSSIL)
pendens, Orthoceras pendens Blake † (FOSSIL)
perroti, Orthoceras perroti Clarke † (FOSSIL)
perseus, Orthoceras perseus Billings, 1865 † - syn of: Bassleroceras perseus (Billings, 1865) † (FOSSIL)
pertinens, Orthoceras pertinens Blake † (FOSSIL)
pillae, Orthoceras pillae Gemmellaro, 1889 † - syn of: Pseudorthoceras pillae (Gemmellaro, 1889) † (FOSSIL)
planoconvexum, Orthoceras planoconvexum Hall † (FOSSIL)
planodorsatum, Orthoceras planodorsatum Whitfield † (FOSSIL)
politum, Orthoceras politum McCoy, 1851 † - syn of: Virgoceras politum (McCoy, 1851) † (FOSSIL)
primaevum, Orthoceras primaevum (Forbes) † (FOSSIL)
progressum, Orthoceras progressum Ruedemann, 1906 † (FOSSIL)
propinquum, Orthoceras propinquum Billings, 1857 † - syn of: Endoceras fulgur Billings, 1866 † (FOSSIL)
pulchellum, Trematoceras pulchellum (Hauer, 1849) † (FOSSIL)
pulchellum, Orthoceras pulchellum Hauer, 1849 † - syn of: Trematoceras pulchellum (Hauer, 1849) † (FOSSIL)
pulchrum, Orthoceras pulchrum Barrande, 1868 † (FOSSIL)
punjabiense, Orthoceras punjabiense Waagen, 1879 † (FOSSIL)
pusgillense, Orthoceras pusgillense Foord † (FOSSIL)
rachidium, Orthoceras rachidium de Koninck, 1863 † (FOSSIL)
regularis, Orthoceras regularis (Schlotheim, 1820) † (FOSSIL)
repens, Orthoceras repens Billings, 1856 † - syn of: Anrangeroceras repens (Billings, 1856) † (FOSSIL)
reticulum, Pseudospyroceras reticulum Kröger, 2008 † (FOSSIL)
riphaeum, Tibichoanoceras riphaeum (Zhuravleva, 1978) † (FOSSIL)
robertsii, Orthoceras robertsii Whidborne † (FOSSIL)
romingeri, Striatocycloceras romingeri (Foerste, 1932) † (FOSSIL)
rushensis, Orthoceras rushensis Meek & Worthen, 1873 † - syn of: Pseudorthoceras knoxense (McChesney, 1859) † (FOSSIL)
saksbyense, Orthoceras saksbyense Teichert, 1930 † - syn of: Geisonoceras wegelini Teichert, 1930 † (FOSSIL)
salinarium, Trematoceras salinarium (Hauer, 1846) † (FOSSIL)
salinarium, Orthoceras salinarium Hauer, 1846 † - syn of: Trematoceras salinarium (Hauer, 1846) † (FOSSIL)
sandlingense, Trematoceras sandlingense (von Mojsisovics, 1873) † (FOSSIL)
sandlingense, Orthoceras sandlingense von Mojsisovics, 1873 † - syn of: Trematoceras sandlingense (von Mojsisovics, 1873) † (FOSSIL)
sarcinatum, Orthoceras sarcinatum Barrande, 1860 † - syn of: Sphooceras truncatum (Barrande, 1860) † (FOSSIL)
scabridum, Orthoceras scabridum Angelin, 1880 † (FOSSIL)
schmidti, Ctenoceras schmidti Noetling, 1884 † (FOSSIL)
secretum, Tenuitheoceras secretum Frey & al., 2014 † (FOSSIL)
selkirkense, Orthoceras selkirkense Whiteaves, 1892 † - syn of: Pleurorthoceras selkirkense (Whiteaves, 1892) † (FOSSIL)
sericatum, Orthoceras sericatum Barrande, 1868 † (FOSSIL)
sericeum, Orthoceras sericeum Salter, 1866 † - syn of: Saloceras sericeum (Salter, 1866) † (FOSSIL)
shastense, Orthoceras shastense Hyatt & Smith, 1905 † (FOSSIL)
siculum, Orthoceras siculum Gemmellaro, 1889 † (FOSSIL)
sociale, Orthoceras sociale Hall, 1877 † - syn of: Isorthoceras junceum (Balashov, 1956) † (FOSSIL)
spissiseptum, Orthoceras spissiseptum Dwight, 1884 † (FOSSIL)
stokesi, Orthoceras stokesi Barrande, 1868 † (FOSSIL)
striatulum, Orthoceras striatulum (Sowerby) † (FOSSIL)
styriacum, Trematoceras styriacum (von Mojsisovics, 1873) † (FOSSIL)
styriacum, Orthoceras styriacum von Mojsisovics, 1873 † - syn of: Trematoceras styriacum (von Mojsisovics, 1873) † (FOSSIL)
subarctuatum, Orthoceras subarctuatum Portlock, 1843 † - syn of: Faberoceras subarctuatum (Portlock, 1843) † (FOSSIL)
subarcuatum, Orthoceras subarcuatum Portlock, 1843 † - syn of: Faberoceras subarcuatum (Portlock, 1843) † (FOSSIL)
subcampanile, Trematoceras subcampanile Kiparisova, 1954 † (FOSSIL)
subconicum, Orthoceras subconicum D'Orbigny, 1850 † - syn of: Armenoceras subconicum (D'Orbigny, 1850) † (FOSSIL)
subcostatus, Orthoceras subcostatus Portlock, 1843 † - syn of: Isorthoceras subcostatum (Portlock, 1843) † (FOSSIL)
subimbricatum, Orthoceras subimbricatum Portlock † (FOSSIL)
submoniliforme, Orthoceras submoniliforme Meneghini, 1857 † (FOSSIL)
subtriangulare, Orthoceras subtriangulare Gemmellaro, 1889 † (FOSSIL)
subundulatum, Orthoceras subundulatum Portlock, 1843 † - syn of: Ilsanella paupera (Billings, 1872) † (FOSSIL)
tafilaltense, Orthocycloceras tafilaltense Kröger, 2008 † (FOSSIL)
temperans, Orthoceras temperans Barrande, 1867 † - syn of: Temperoceras ludense (Sowerby, 1839) † (FOSSIL)
tenui, Orthoceras tenui McCoy † (FOSSIL)
tenuiseptum, Orthoceras tenuiseptum Ruedemann, 1906 † - syn of: Valcouroceras tenuiseptum (Ruedemann, 1906) † (FOSSIL)
thyrsus, Kopaninoceras thyrsus (Barrande, 1870) † (FOSSIL)
tibichoanum, Tibichoanoceras tibichoanum Kröger, 2008 † (FOSSIL)
tortum, Orthoceras tortum Angelin, 1880 † - syn of: Nilssonoceras nilssoni (Boll, 1857) † (FOSSIL)
transiens, Orthoceras transiens Barrande, 1866 † - syn of: Pseudocycloceras transiens (Barrande, 1866) † (FOSSIL)
triadicum, Trematoceras triadicum (von Mojsisovics, 1873) † (FOSSIL)
triadicum, Orthoceras triadicum von Mojsisovics, 1873 † - syn of: Trematoceras triadicum (von Mojsisovics, 1873) † (FOSSIL)
truncatum, Orthoceras truncatum Barrande, 1860 † - syn of: Sphooceras truncatum (Barrande, 1860) † (FOSSIL)
turris, Orthoceras turris Angelin, 1880 † - syn of: Cameroceras regulus Eichwald, 1860 † (FOSSIL)
tyronensis, Orthoceras tyronensis Foerste, 1912 † - syn of: Proteoceras tyronensis (Foerste, 1912) † (FOSSIL)
undulocinctum, Orthoceras undulocinctum Blake † (FOSSIL)
undulostriatum, Striatocycloceras undulostriatum (Hall, 1847) † (FOSSIL)
vagum, Orthoceras vagum Ruedemann, 1906 † (FOSSIL)
vesiculosum, Orthoceras vesiculosum de Koninck, 1863 † (FOSSIL)
vicarii, Orthoceras vicarii Whidborne † (FOSSIL)
vicarii eductum, Orthoceras vicarii eductum Whidborne † (FOSSIL)
waageni, Orthoceras waageni Gemmellaro, 1889 † (FOSSIL)
wahlenbergii, Orthoceras wahlenbergii Boll, 1857 † - syn of: Nilssonoceras nilssoni (Boll, 1857) † (FOSSIL)
winchelli, Orthoceras winchelli Flower, 1963 † - syn of: Engorthoceras winchelli (Flower, 1963) † (FOSSIL)
xerxes, Orthoceras xerxes Billings, 1865 † - syn of: Protocycloceras xerxes (Billings, 1865) † (FOSSIL)
zonatum, Orthoceras zonatum Gemmellaro, 1889 † - syn of: Bitaunioceras zonatum (Gemmellaro, 1889) † (FOSSIL)
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