Strophiops (Umbonis) aspera Maynard & Clapp in Maynard, 1920
Maynard, 1919a:14 [nomen nudum]; Maynard, 1920a:77 [nomen nudum]; Maynard and Clapp in Maynard, 1920b:89, fig. 57, pl. 12, fig. 1; Maynard and Clapp in Maynard, 1920d:116, map 1, 4, pl. 1, figs. 9, 10.; Maynard, 1924a:167.; Harasewych et al., 2007:448-449, fig. 125.
Cerion (Umbonis) asperum
Clench & Aguayo, 1952:428-430, pl. 56, figs. 1-2..
Maynard (1920d:116) reported this taxon to be abundant, but mostly dead. Out of 1500 specimens collected only 70 were living. Maynard (1924a:167) contradicted this number, stating that of 953 collected, 70 were living, and provided more detailed descriptions of the shell, ecology and anatomy of this taxon. Clench & Aguayo (1951) considered Cerion asperum to be a valid species and the senior synonym of Strophiops scalariformis.
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