Project 2202: A. Ziegler, J. Lenihan, L. G. Zachos, C. Faber, R. Mooi. 2016. Comparative morphology and phylogenetic significance of Gregory’s diverticulum in sand dollars (Echinoidea: Clypeasteroida). Organisms Diversity & Evolution. 16 (1):141-166.
This project has 46 taxa.