Mooi, Rich, Andreas Kroh, and Dinesh K. Srivastava. 2014. “Phylogenetic Re-Evaluation of Fossil and Extant Micro-Echinoids With Revision of Tridium, Cyamidia, and Lenicyamidia Echinoidea: Clypeasteroida)”. Zootaxa 3857 (4). Auckland, New Zealand:501–526. https://doi.org/10.11646/zootaxa.3857.4.3.