ammonites
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Spirolegoceras Miller et al. 1957 (ammonite)

Cephalopoda - Ammonoidea - Spirolegoceratidae

PaleoDB taxon number: 13889

Full reference: A. K. Miller, W. M. Furnish, and D. L. Clark. 1957. Permian ammonoids from western United States. Journal of Paleontology 31(6):1057-1068

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

Sister taxa: Archboldiceras, Gobioceras

Subtaxa: Spirolegoceras fischeri

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Ecology: fast-moving nektonic carnivore