Classification of the genus Isorthoceras
G. †Isorthoceras Flower 1962
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†Isorthoceras albersi Miller and Faber 1894
†Isorthoceras angelini Kröger 2013
†Isorthoceras cavi Kröger and Aubrechtova 2017
†Isorthoceras curvilineatum Kröger 2013
†Isorthoceras dalecarlense Kröger et al. 2011
†Isorthoceras elongatocinctum Portlock 1843
†Isorthoceras heintzi Strand 1934
†Isorthoceras heroyense Strand 1934
†Isorthoceras hudsonicum Ruedemann 1912
†Isorthoceras junceum Hall 1877
†Isorthoceras maris Kröger and Aubrechtova 2017
†Isorthoceras nikwis Kröger and Aubrechtová 2019
†Isorthoceras padisense Kröger and Aubrechtova 2017
†Isorthoceras rogersensis Foerste 1914
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Invalid names: Treptoceras praenuntium Flower 1942 [synonym]
†Isorthoceras sociale Hall in Miller 1877
†Isorthoceras strigatum Hall 1847
†Isorthoceras suave Angelin and Lindström 1880
†Isorthoceras subcostatum Portlock 1843
†Isorthoceras sylphide Kröger and Aubrechtová 2019
†Isorthoceras urdr Kröger and Aubrechtová 2019
†Isorthoceras vexilli Kröger and Aubrechtova 2017
†Isorthoceras wahlenbergi Niko 2007