Nestell, G. P.; Nestell, M. K. (2006). Middle Permian (Late Guadalupian) foraminifers from Dark Canyon, Guadalupe Mountains, New Mexico. Micropaleontology. 52(1): 1-50., available online at (https://doi.org/10.2113/gsmicropal.52.1.1) page(s): p. 8, Plate 2, figures 10-27 (holotype fig. 18).
