Plate 40

Description:

Plate 40. Prorocentrum concavum. Figs. 1-4. SEM. Fig. 1. Right valve. Cell ovate and heavily areolate. Valve center devoid of areolae. Left valve with anterior apical ridge (arrowhead). Fig. 2. Lateral view. Valve center concave and flattened. Intercalary band granulated and horizontally striated. Fig. 3. Valve areolae round to oval with smooth edges; some with small central pores. Fig. 4. Periflagellar area a V-shaped depression. Two pores: small auxiliary pore (a); large flagellar pore (f). Figs. 5-6. LM (M.A. Faust). Fig. 5. Right valve. Fig. 6. Left valve. Fig. 7. Line drawing: areolae arrangement. (Figs. 1-4,7 after Faust 1990b)