Cephalopoda - Dissidocerida - Rangeroceratidae

Full reference: D. H. Evans. 2005. The Lower and Middle Ordovician cephalopod faunas of England and Wales. Monograph of the Palaeontographical Society 623:1-81

Parent taxon: Rangeroceratidae according to D. H. Evans 2005

Sister taxa: Anrangeroceras, Rangeroceras

Subtaxa: Cyclorangeroceras blakei

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Type: Cyclorangeroceras blakei

Ecology: fast-moving nektonic carnivore