Classification of the genus Geisonoceras
G. †Geisonoceras Hyatt 1884
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†Geisonoceras heintzi Strand 1934
†Geisonoceras kureikense Zhuraleva 1964
†Geisonoceras maclareni Murchison 1859
†Geisonoceras shumardi Billings 1859
†Geisonoceras wegelini Teichert 1930