Scutellinidae, Pomel, 1888

Ziegler, Alexander, Lenihan, Jennifer, Zachos, Louis G., Faber, Cornelius & Mooi, Rich, 2016, Comparative morphology and phylogenetic significance of Gregory’s diverticulum in sand dollars (Echinoidea: Clypeasteroida), Organisms Diversity & Evolution (New York, N. Y.) 16 (1), pp. 141-166 : 154

Scutellinidae

This fossil clypeasteroid family is here represented by three species, Lenita patellaris , Scutellina lenticularis , and Scutellina nummularia . No trace of the organ was found in any of the available specimens. With test lengths of 7–12 mm, these specimens fall into the size range at which a sand-filled Gregory’ s diverticulum would be expected. However, all individuals had been fossilized without the presence of Aristotle’ s lantern, suggesting that internal organs decayed prior to fossilization.