Prorocentrum hoffmannianum

Figs. 13-16. . Prorocentrum hoffmannianum sp. nov. FIG.13. The Valve surface is areolated and slightly concave. FIG. 14. The body is ovoid in valve view with the maximum width behind the middle region. The body is narrow at the anterior end. FIG. 15. The cell is round in side view and convex in the middle of the valve. The flagellar pore area is attached to the right valve; surrounded by a distinct flared ridge that is V-shaped, triangular with a complex arrangement of flagellar platelets unequal in size. The intercalary band is smooth. FIG. 16. The areolae are round to ovoid with a smooth margin. Areolae are perforated by oval openings. The flagellar pore (f) (arrow) is surrounded by a flared apical collar (arrow) and is adjacent to an auxiliary pore (a). Scale bars = 200 µm. EMu: SEM NEGATIVES # 27013; SEM STUB # 27; FIELD # 132-88; ACCESSION # 407160; CATALOG # 22; FIGURE # 13.

Plate 42. Prorocentrum hoffmannianum. Figs. 1-4. SEM. Fig. 1. Right valve: cell ovoid, tapering slightly apically. Valve surface areolated, slightly concave. Curved apical collar (arrow). Fig. 2. Left valve: distinct flared apical collar bordering periflagellar area (arrowheads). Marginal areolae large. Intercalary band smooth. Fig. 3. Areolae round to ovoid with smooth margins. Some with small pores (arrows). Fig. 4. Periflagellar area: flagellar pore (f) surrounded by flared periflagellar collar (arrowheads), adjacent to auxiliary pore (a); pores equal in size. Fig. 5. LM. Left valve: central pyrenoid (arrow); posterior nucleus (n). Intercalary band appears striated (M.A. Faust). Fig. 6. Line drawing: areolae arrangement. (Figs. 1-4,6 after Faust 1990b)