Orthoceras aciculoides- Orthoceras adamsi
- Orthoceras alienoides
- Orthoceras annulatum
- Orthoceras antigonishense
- Orthoceras asmodeus
- Orthoceras baculum
- Orthoceras bassleri
- Orthoceras bilineatum
- Orthoceras bipartitum
- Orthoceras byronense
- Orthoceras caneyanum
- Orthoceras carltonense
- Orthoceras chicottense
- Orthoceras choctawense
- Orthoceras cincinnatiensis
- Orthoceras clarki
- Orthoceras clarksvillense
- Orthoceras clemvillense
- Orthoceras cochleatum
- Orthoceras colon
- Orthoceras confertiseptatum
- Orthoceras conicum
- Orthoceras consortale
- Orthoceras crebriliratum
- Orthoceras cribrosum
- Orthoceras crotalum
- Orthoceras demissum
- Orthoceras dunbari
- Orthoceras duseri
- Orthoceras dyeri
- Orthoceras elegantulum
- Orthoceras erraticum
- Orthoceras eurekensis
- Orthoceras excentricus
- Orthoceras expansum
- Orthoceras fasciolatum
- Orthoceras ferecylindricum
- Orthoceras filosum
- Orthoceras fluminense
- Orthoceras franklinense
- Orthoceras fusiforme
- Orthoceras gesneri
- Orthoceras gigantea
- Orthoceras gorbyi
- Orthoceras guadalupense
- Orthoceras hammelli
- Orthoceras hanoverense
- Orthoceras hulli
- Orthoceras imbricatum
- Orthoceras inceptum
- Orthoceras indianum
- Orthoceras kingii
- Orthoceras lambtonense
- Orthoceras leander
- Orthoceras lesueuri
- Orthoceras liaotungense
- Orthoceras longissimicameratum
- Orthoceras ludense
- Orthoceras luhai
- Orthoceras magnichinense
- Orthoceras mcadamense
- Orthoceras mckenzicum
- Orthoceras mephisto
- Orthoceras milleri
- Orthoceras moodiense
- Orthoceras nummularium
- Orthoceras obstructum
- Orthoceras olorus
- Orthoceras ontario
- Orthoceras ortoni
- Orthoceras parlinense
- Orthoceras politum
- Orthoceras porteri
- Orthoceras princiana
- Orthoceras recedens
- Orthoceras rectiseptatum
- Orthoceras rectum
- Orthoceras robustum
- Orthoceras rogersensis
- Orthoceras scalariformis
- Orthoceras schucherti
- Orthoceras shastense
- Orthoceras shatzeri
- Orthoceras strix
- Orthoceras submoniliforme
- Orthoceras subundata
- Orthoceras toyamai
- Orthoceras toyami
- Orthoceras tuba
- Orthoceras tyronensis
- Orthoceras undulata
- Orthoceras vagum
- Orthoceras waupanuckense
- Orthoceras wegelini
- Orthoceras whitfieldi
- Orthoceras wilmingtonense
- Orthoceratites blakei
- Orthoceros regularis