Cerion angustocostata Maynard and Clapp in Maynard, 1921
Maynard and Clapp in Maynard, 1921b:141, plate 37, figs. 7,8; Harasewych et al., 2007:501-502, fig. 210.
Clench (1952:109) listed this taxon as a synonym of C. exiguum (Maynard, 1913).
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