Dunbar, C. O.; Skinner, J. W. (1937). Permian Fusulinidae of Texas; in The geology of Texas. Texas University Bulletin. 3701 v.3(2): 517-825., available online at (http://hdl.handle.net/2152/24042) page(s): p. 607 pl. 45 figs. 1-9 Lectotype pl. 45 fig. 7 designated by Thompson (1948)
