[citation needed] The type, and only species, P. herveyi, was named in 1898.

[2] In 1894, W. A. Sanford described the fossil remains of what he considered to be two large reptiles discovered near Westbury-on-Severn, Glastonbury (Westbury Formation) by Eev.

[3][2] Harry Govier Seeley described the fossils and named two genera: Avalonia (preoccupied; now Avalonianus) and Picrodon; both are based solely on teeth.

[2] Only a single tooth, holotype BMNH R2875, belonging to P. herveyi is known, making the remains insufficient to make judgments on its diet or its classification; although it is agreed that Picrodon was an archosaur to some degree.

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