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Spyroceras
Taxonomy
Spyroceras was named by Hyatt (1884). Its type is Spyroceras crotalum.
It was assigned to Spyroceratinae by Sweet (1964); to Pseudorthoceratidae by Flower (1945), Crick (1981); to Kionoceratidae by Strand (1934), Dzik and Kiselev (1995); and to Spyroceratidae by Kröger (2008).
It was assigned to Spyroceratinae by Sweet (1964); to Pseudorthoceratidae by Flower (1945), Crick (1981); to Kionoceratidae by Strand (1934), Dzik and Kiselev (1995); and to Spyroceratidae by Kröger (2008).
Species
S. baffinense, S. bilineatum, S. boreale, S. chambliense, S. clathratoannulatum, S. crotalum (type species), S. cylindratum, S. cyrtopatronus, S. damesi, S. ferum, S. fukuijense, S. giganteum, S. latepatronus, S. middlevillense, S. olorus, S. patronus, S. perlaeve, S. persculptum, S. textumarenaceum
Species lacking formal opinion data