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: Test ovoid to subspherical; aperture terminal; with three to six lobes; diameter 80-120 μm (Kudo, 1966). 90-170 μm long; 70-160 μm diam.; test, ovoid, round in cross-section; pseudostome terminal, usually quadrilobate, 30-50 μm diam. (Illustrated Guide, 1985).

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D. lobostoma 112 x 75μm L/W=1.5 Japan, 199?	D. lobostoma 95-100 x 75-80 μ L/W=1.3 Japan, 199?	D. lobostoma 100 x 70 μm L/W=1.4 Japan, 199?	D. lobostoma ? or D. tuberculata ? 95 x 75 μm L/W=1.3 with 5 lobes Japan, 1998 Movies
D. lobostoma 93 x 72 μm L/W= Tennoh Tessei-cho Okayama, 2004	D. lobostoma test formation μm L/W= Japan, 199?	D. lobostoma cell division μm L/W= Japan, 1998 Movies	D. lobostoma ? μm L/W= Japan, 1998
D. lobostoma ? 78 x 60 μm L/W=1.3 Iruma river Kawagoe Saitama, 2004	D. lobostoma 65-78 x 52-56 μm L/W=1.3-1.4 Uruguay, 1999	D. lobostoma 65 x 53 μm 62 x 45 μm L/W=1.2, 1.4 with 3 lobes Uruguay, 1999	D. lobostoma ? 68 x 58 μm L/W=1.2 Omine-numa Tsukiyono Gunma, 2003
D. lobostoma ? 120 x 93 μm 122 x 85 μm L/W=1.3, 1.4 with apical cones Kurome river Saitama, 1998	D. lobostoma ? 110 x 96 μm L/W=1.1 with apical cones Shikinawa-ike Fukuoka, 2001

Similar Genus -->> Pseudodifflugia; Diaphoropodon

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