SIappendixFigS2

Supporting information Fig. S2. Detailed views of Testudoolithus osspp. eggshell morphology, and Desmatochelys padillai FCG-CBP-75 specimen. (A–B). One of the portions of the egg for which a thin section was made, showing well defined shell units, pores, and caverns, 4X magnification; (C–D). Close-up of one of the pores of the eggshell, showing also well define calcite crystals; (E–F). Close-up of the most posterior portion of the carapace of D. padillai FCG-CBP-75, showing the posterior almost parallel to the midline of the carapace projection of the naked costal rib of the most posterior costal bone; (G–H). Close-up of the most posterior portion of the shell of the extant sea turtle Caretta caretta NMW 31531(Natural History Museum, Vienna, Austria), showing the same pattern of naked costal rib posteriorly projected described in (G-H) for D. padillai. Abbreviations: ca, cavern; cr, costal rib; po, pore; rc, recrystallized calcite.