Heterodontus zebra (Gray, 1831)

3.1.9 | Heterodontus zebra View in CoL

A medium-sized heterodontid egg case ( 96.6 – 119.2 mm ECL), lateral keels making 0.75 – 1 rotation from anterior to posterior ends; surfaces smooth; anterior margin broad, weakly S-shaped when viewed from anterior plane; widest at anterior half, abruptly tapering at posterior third; keel base to keel apex space at midportion very large (31.0% – 44.9% ECL); keels narrow (3.7% – 4.6% ECL), rigid, projecting slightly outward and curving strongly anteriorly (Figure 2h), tapering into long curling tendrils at posterior end. Color olive-greenish brown when fresh and light golden brown, or dark brown to black when preserved (Figure 11).