Figure 4 in Anatomy, shell morphology, and microstructure of the living fossil Pulvinites exempla (Hedley, 1914) (Mollusca: Bivalvia: Pulvinitidae)

Figure 4. Surface features of prodissoconch 1 in Pulvinites exempla (scanning electron microscopy; NMNZ M.150090). A, overview of the interior of joined valves in lateral view showing the D-shaped outline and straight hinge (scale bar = 100 µm). B, exterior surface of a valve in lateral view; the close-up of the squared area (inset) shows a nodulose surface; the arrow indicates the commarginal fold demarcating the marginal rim (scale bar = 100 µm). C, exterior surface of a valve in dorsal view showing faint commarginal and radial striae; the arrow indicates the periostracal ligament (scale bar = 10 µm). D, lateral view of the inner surface showing the granular interior surface and smooth valve margin (scale bar = 2 µm).