Moore RC, Breimer A, Ubaghs G. Part T, Echinodermata 2, vol. 1-3, ch. 1, p. 1 - 216. InvertebratePaleo [Internet]. 1978 Jan. 1 [cited 2024 May 5];. Available from: https://journals.ku.edu/InvertebratePaleo/article/view/5642