Figure 3
Stillatuberoolithus storrsi oogen. et oosp. nov. microscopic imagery (a) Radial thin section of DMNH EPV. 65602 (holotype) in cross-polarized (top) and plane light (bottom). Note columnar extinction pattern with irregular boundaries in the continuous layer. Compare to Sahni et al. (1994) Fig. 13.10d and Tanaka et al.18 Fig. 2e; (b) Insets from the node in section A showing that accretion lines are absent through the nodes (left). Accretion lines (arrows) dip downward at the cavities under the nodes, consistent with pore canal systems (right); (c) SEM image of UCM 1139 (paratype) in radial view. Arrows indicate boundary between mammillary and continuous layers; (d) Right inset from section A providing a close view of eggshell microstructure. Note tightly packed mammillae with tabular ultrastructure and faint “columnar structures” in the continuous layer. Compare to Sahni et al.19 Fig. 13.10e. Arrow indicates transition between mammillary and continuous layers; (e) Inner surface of UCM 1139 (paratype) displaying tightly packed mammillae. Inset scale is 0.1 mm.
