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Ellesmeroceras
Taxonomy
Ellesmeroceras was named by Foerste (1921) [Sepkoski's age data: O Trem-l O Trem-u Sepkoski's reference number: 524]. Its type is Ellesmeroceras scheii.
It was assigned to Orthocerotidae by Ulrich et al. (1944); and to Ellesmeroceratidae by Flower (1964), Teichert et al. (1964), Crick (1981), Kröger and Landing (2007), Evans (2011).
It was assigned to Orthocerotidae by Ulrich et al. (1944); and to Ellesmeroceratidae by Flower (1964), Teichert et al. (1964), Crick (1981), Kröger and Landing (2007), Evans (2011).
Species
E. (Metaellesmeroceras), E. bridgei, E. elongatum, E. expansum, E. higdonense, E. hotchkissi, E. indomitum, E. luthei, E. scheii (type species), E. thomasi, E. winonicum