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: Size, 90-130 μm long; 30-45 μm wide; Test, long-oval, with nipple-like extention at base; clear chitinoid, imbedded siliceous particles; pseudostome, oval, 20-30 by 15-20 μm (Illustrated Guide, 1985).

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D. mammilaris 112 x 88 μm L/W=1.3 Japan, 199?	D. mammilaris μm L/W= Japan, 1998	D. mammilaris 100 x 64 μm L/W=1.6 Japan, 1998	D. mammilaris 88 x 64 μm L/W=1.4 Japan, 199?
D. mammilaris 62 x 49 μm L/W=1.3 Japan, 199?	D. mammilaris 62 x 47 μm L/W=1.3 Japan, 199?	D. mammilaris 62 x 41 μm L/W=1.5 Japan, 199?	D. mammilaris 62 x 38 μm L/W=1.6 Japan, 1998
D. mammilaris 39 x 24 μm L/W=1.6 Lake Shirakaba Tateshina & Chino Nagano, 2005	D. mammilaris 120 x 62 μm L/W=1.9 Shimo-no-koike Shiga highland Nagano, 2004

Similar Genus -->> Pseudodifflugia; Diaphoropodon

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