Reptilia - Testudines - Trionychidae

Full reference: O. P. Hay. 1908. The fossil turtles of North America. Carnegie Institution of Washington Publication 75:1-568

Parent taxon: Plastomeninae according to P. A. Holroyd and J. H. Hutchison 2002

Sister taxa: Hutchemys, Plastomenus

Subtaxa: Helopanoplia distincta

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Type: Helopanoplia distincta

Ecology: aquatic piscivore-carnivore