Thompson, M. L. (1942). New genera of Pennsylvanian fusulinids. American Journal of Science. 240(6): 403-420., available online at (https://doi.org/10.2475/ajs.240.6.403) page(s): p. 414 pl. 2 figs. 1-15 Lectotype: pl. 2 fig. 1 designated by Thompson (1948, p. 35)