Cózar, P.; Somerville, I. D.; Burgess, I. (2008). New foraminifers in the Visean/Serpukhovian boundary interval of the Lower Limestone Formation, Midland Valley, Scotland. Journal of Paleontology. 82(05): 906-923., available online at (https://doi.org/10.1666/07-103.1) page(s): p. 916, Figure 7.14–7.19 (holotype 7.18).
