Moore RC, Strimple HL. Part T, Echinodermata 2, vol. 1-3, ch. 7, p. 760 - 812. InvertebratePaleo [Internet]. 1978 Jan. 1 [cited 2024 Apr. 27];. Available from: https://journals.ku.edu/InvertebratePaleo/article/view/5648