Benthic marine diatom flora of Guam: new records, redescription of Psammodictyon pustulatum n. comb., n. stat., and three new species (Colliculoamphora gabgabensis, Lauderia excentrica, and Rhoiconeis pagoensis) Lobban, Christopher S. Micronesica 2015 2015 2 1 49 Voigt Voigt [232,573,849,874] Gastropoda Achatinellidae Auricula Animalia Stylommatophora 2 3 Mollusca species flabelliformis  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 in10 µm; fibulae ca. 8 in10 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 SEMspecimen from Guamand an LMspecimen from Yap. Voigt named three varieties besides the typein 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).