Family: Pseudostome terminal, of variable shape.
Genus: Pseudostome lacks lobed collar; test round or oval in cross-section; pseudostome relatively large, with or lacking a collar (Illustrated Guide, 1985).
Species: 100-300 μm long; 120-320 μm wide (diam.); with up to 15 spines at level of broadest diam as a crown; pseudostome round, 4-20 dentate lobes, 50-150 μm diam. (Illustrated Guide, 1985). Test ovoid to spheroid, circular in cross-section; crown broadly rounded, with a variable number of spines; aperture (pseudostome) more or less convex in profile, central and its border multidentate or multlobate; test with fine sand-grains, opaque; 180-230 μm long, about 150 μm wide (diam.) (Kudo, 1966).

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D. corona 188 x 188 μm L/W=1.0 Japan, 199?	D. corona 165 x 180 μm L/W=0.9 Japan, 199?	D. corona μm L/W= Japan, 1998 Movies	D. corona μm L/W= Saitama, 1999
D. corona μm L/W= Sue-machi Fukuoka, 2001	D. corona 160 x 166 μm Aizu Recreation p. Aizuwakamatsu Fukushima, 2005	D. corona ? μm L/W= Saitama, 1999	D. corona ? 105 x 95 μm L/W=1.1 Uruguay, 1999

Similar Genus -->> Pseudodifflugia; Diaphoropodon

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