Cephalopoda - Orthoceratoidea

Full reference: B. Kröger. 2008. A new genus of middle Tremadocian orthoceratoids and the Early Ordovician origin of orthoceratoid cephalopods. Acta Palaeontologica Polonica 53(4):745-749

Parent taxon: Orthoceratoidea according to B. Kröger 2008

Sister taxa: Brachycycloceratidae, Dissidocerida, Offleyoceratidae, Orthocerida, Paraphragmitidae, Sactorthoceratidae

Subtaxa: Slemmestadoceras attavus

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Ecology: fast-moving nektonic carnivore