Auricula flabelliformis Voigt Figs 10–12

Syn.: A. machutchoniae Giffen (1970b)

Ref. illus.: Voigt 1960, pl. 1, figs 8, 9; Ricard 1977, pl. 8, fig. 2; Ricard 1987, fig. 942

Samples: Guam: GU66A-2; Yap: Y26B

Dimensions: Length 92–95 µm, width 64–67 µm, striae ca. 19 in 10 µm; fibulae ca. 8 in 10 µm.

Diagnostics: Large, broadly reniform valve, dorsal margin (defined by the raphe-keel) forming>90% of the circumference, indented from the valve margin before the ventral ends; ventral margin very short, straight. Striation flabellate, arising along a poorly defined median line.

Comments: Observed so far as only a single SEM specimen from Guam and an LM specimen from Yap. Voigt named three varieties besides the type in which the pattern of striae along the median axis ranged from flabelliform to distichous ( var. hustedtii), the latter based on Meister’s (1932, pl. 10, fig. 67) Hustedtia mirabilis, now Auricula mirabilis (Meister) Paddock & Sims (1980) .