Cox LR, Soot-Ryen T, Brasnson CC, Stenzel HB, LaRocque A, Keen AM, et al. Part N, Mollusca 6, vol. 1, ch. 4, p. 393–489. InvertebratePaleo [Internet]. 1969 Jan. 1 [cited 2024 Nov. 21];. Available from: https://journals.ku.edu/InvertebratePaleo/article/view/5591