Traits taxon details
original description
(of ) Hall, J. (1859). Palaeontology: Volume 3. Containing descriptions and figures of the organic remains of the lower Helderberg Group and the Oriskany Sandstone 1855-1859. Part I. <em>Natural History of New-York, Geological Survey of New.</em> 3: 1-532., available online at http://books.google.com/books?id=w20_AAAAcAAJ page(s): 346, pl. 72, fig. 4 [details]
new combination reference
Flower, R. H. (1939). Study of the Pseudorthoceratidae. <em>Paleontographica Americana. Illustrated contributions to the invertebrate paleontology of America.</em> 2 (10): 1-198., available online at https://www.biodiversitylibrary.org/page/10655437 page(s): 90 [details]
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