直角石科(学名:Orthoceratidae)为直角石目的一个科。
本科包括以下属:
- Acanthomichelinoceras Kröger, Klug & Mapes, 2005
- Aethiosolen Flower, 1968
- Arkonoceras Flower, 1945
- Arkonoceras arkonense Flower, 1945
- Balticoceras Teichert, 1940
- Bifoveoceras Balashov, 1956
- Bitaunioceras Shimizu & Obata, 1936
- Chebbioceras Klug, Kröger, Korn, Rücklin, Schemm-Gregory, de Baets & Mapes, 2008
- Chebbioceras erfoudense Klug et al., 2008
- Ctenoceras Noetling, 1884
- Eneoceras Cheng, Zhang & Zhang, 2005
- Hesperoceras Miller & Youngquist, 1947
- Imbricatoceras Holland, 1992
- Infundibuloceras Klug, Kröger, Korn, Rücklin, Schemm-Gregory, de Baets & Mapes, 2008
- Kionoceras Hyatt, 1884
- Kopaninoceras Kiselev, 1969
- Leurocycloceras Foerste, 1928
- Melia Fischer, 1829
- Merocycloceras Ristedt, 1969
- Michelinoceras Foerste, 1932
- 直角石属 Orthoceras Bruguière, 1789
- Orthocycloceras Barskov, 1972
- Palorthoceras Kröger, Beresi & Landing, 2007
- Paramichelinoceras Zhuravleva, 2003
- Paratrematoceras Schastlivtseva, 1981
- Plagiostomoceras Teichert & Glenister, 1952
- Plagistomoceras
- Pleurorthoceras Flower, 1962
- Pojetoceras Frey, 1995
- Polygrammoceras Foerste, 1928
- Protobactrites Hyatt, 1900
- Pseudospyroceras Kroger, 2008
- Pseudospyroceras reticulum Kröger, 2008
- 震旦角石属 Sinoceras Shimizu & Obata, 1935
- Striatocycloceras Kröger & Isakar, 2006
- Tenuitheoceras Frey, Naglik, Hofmann, Schemm-Gregory, Frýda, Kröger, Taylor, Wilson & Klug, 2014
- Theoceras Kröger, 2008
- Thoracoceras Fischer, 1844
- Tibichoanoceras Kroger, 2008
- 田氏角石属 Tienoceras Zhao, 1954
- Trematoceras Eichwald, 1851