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Geisonoceras
Taxonomy
Geisonoceras was named by Hyatt (1884).
It was assigned to Orthoceratidae by Strand (1934); to Orthocerida by Sepkoski (2002); and to Geisonoceratidae by Teichert et al. (1964), Miagkova (1967), Chen et al. (1981), Crick (1981) and Kröger (2013).
It was assigned to Orthoceratidae by Strand (1934); to Orthocerida by Sepkoski (2002); and to Geisonoceratidae by Teichert et al. (1964), Miagkova (1967), Chen et al. (1981), Crick (1981) and Kröger (2013).
Species
Species lacking formal opinion data