Heterodontus marshallae

3.1.4 | Heterodontus marshallae

Described in White et al. (2023) as a medium-sized heterodontid egg case ( 98.5 mm ECL), lateral keels making 1½ rotations from anterior to posterior ends; surfaces smooth; anterior margin broad and very weakly S-shaped when viewed from anterior plane; widest at anterior end, abruptly tapering posteriorly from posterior third; keel base to keel apex space at midportion very large (28.2% – 30.4% ECL); keels narrow (4.4% – 5.3% ECL), rigid, projecting outward and curving strongly anteriorly (Figure 2d), tapering into long curling tendrils at posterior end. Color golden brown with slight greenish hue when preserved (Figure 6).