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Spyroceras twenholfeli Foerste

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Mollusca

Cephalopoda

Pseudorthoceratidae

Spyroceras Hyatt 1884

Spyroceras twenholfeli Foerste (bu sayfa)

Orthoceras bilineatum (Hall 1847)

Orthoceras clathratoannulatum (Roemer 1861)

Orthoceras crotalum (Hall 1879)

Orthoceras damesii (Krause 1877)

Orthoceras patronus (Barrande 1866)

Spyroceras anticostiense Foerste

Spyroceras barbense Foerste

Spyroceras beauportense Whiteaves

Spyroceras boreale Foerste & Savage 1927

Spyroceras chaleurense Foerste

Spyroceras chambliense Foerste 1924

Spyroceras chicottense Foerste

Spyroceras clarkei Prosser

Spyroceras cyrtopatronus Kröger 2008

Spyroceras distoannulatum Foerste

Spyroceras falsum Fenton & Fenton

Spyroceras ferum Billings 1866

Spyroceras fukuijense Niko 1996

Spyroceras geneva

Spyroceras giganteum Flower 1945

Spyroceras goldringae Flower

Spyroceras incarceratum

Spyroceras latepatronus Kröger 2008

Spyroceras laurensense Flower

Spyroceras magnosiphonatum Foerste

Spyroceras mcfarlani Foerste

Spyroceras microcancellatum Foerste

Spyroceras microlineatum Foerste

Spyroceras microtextile Foerste

Spyroceras middlevillense Foerste 1928

Spyroceras northropi Foerste

Spyroceras olorus Hall 1879

Spyroceras perlaeve Strand 1934

Spyroceras rudens

Spyroceras ruedemanni Foerste

Spyroceras staffordense

Spyroceras tenuiclathratum Foerste

Spyroceras textumarenaceum Roemer 1861

Spyroceras thester

Spyroceras tullyense Flower

Spyroceras vaurealense Foerste

Spyroceras whitcombi Foerste

Spyroceras williamsi Flower