ammonites
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Macrogrammites Buckman 1928 (ammonite)

Cephalopoda - Ammonitida - Schlotheimiidae

PaleoDB taxon number: 257547

Synonym: Storthoceras Lange 1941 (taxon 257548)

Parent taxon: Schlotheimiidae according to M. K. Howarth 2013

Sister taxa: Angulaticeras, Kammerkarites, Saxoceras, Schlotheimia, Waehneroceras

Subtaxa: Storthoceras australe, Storthoceras garfieldense

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Ecology: fast-moving nektonic carnivore