Cephalopoda - Goniatitida

Alternative spelling: Marathonitaceae

Parent taxon: Goniatitina according to W. M. Furnish et al. 2009

Sister taxa: Adrianitoidea, Agathiceratoidea, Cycloloboidea, Dimorphoceratoidea, Gastrioceratoidea, Goniatitoidea, Gonioloboceratoidea, Neodimorphoceratoidea, Neoglyphioceratoidea, Neoicoceratoidea, Nomismoceratoidea, Pericycloidea, Popanoceratoidea, Schistoceratoidea, Shumarditoidea, Somoholitaceae, Thalassoceratoidea

Subtaxa: Hyattoceratidae, Marathonitidae

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Ecology: fast-moving nektonic carnivore