A new genus of middle Tremadocian orthoceratoids and the Early Ordovician origin of orthoceratoid cephalopods

B. Kröger

2008

Article

Acta Palaeontologica Polonica 53(4):745-749

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Taxa discussed in this work:

• Orthoceratoidea
• Slemmestadoceras
• Slemmestadoceras attavus

Taxonomy:

• Slemmestadoceras attavus belongs to Slemmestadoceras - Kröger (2008)
• Slemmestadoceras belongs to Orthoceratoidea - Kröger (2008)