original description
Müller, J. (1851). Monographie der Petrefacten der Aachener Kreideformation. Zweite Abtheilung. Henry & Cohen, Bonn, 88 pp. + pls. 3–6.
page(s): 50-51, pl. 6, fig. 11 [details]
From editor or global species database
Additional information Müller (1851) listed "Pileopsis compressa Müller" in synonymy, referring to an his older species list from 1849, stating that the name is a homonym of Pileopsis compressa Goldfuss, 1841. However, Müller's name is not available from 1849, there it is a nomen nudum. [details]