Family: Pseudostome ventral, more or less invaginated (Illustrated Guide, 1985).
Genus: Test circular, ovoid or discoid; pseudostome eccentric (acentric), circular or ovoidal; with or without spines (Kudo, 1966).

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C. discoides 6 samples 166-200 μm 2-7 spines 199?-2005	C. aculeata 39 samples 46-170 μm 199?-2007	C. aculeata 38 samples 46-170 μm 199?-2006	C. aculeata ? 140 x 100 μm Univ. A.V.M. Obihiro Hokkaido, 2005
Centropyxis sp. 200 x 150 μm Koigakubo marsh Tessei-cho Okayama, 2004	C. ecornis 11 samples 54-230 μm 199?-2006
Centropyxis sp. 100 x 90 μm Kawatabi Narugo Miyagi, 2003	Centropyxis sp. 110 x 90 μm Watarase river Ashikaga Tochigi, 2004	Centropyxis sp. 105 x 100 μm Japan, 199?	Centropyxis sp. 98 x 85 μm Japan, 199?
Centropyxis sp. 90 x 80 μm 80 x 70 μm Japan, 1999	Centropyxis sp. 70 x 64 μm Tennoh Tessei-cho Okayama, 2005	Centropyxis sp. 50 x 50 μm Japan, 199?
C. aerophila 3 samples 118-160 μm 199?-2004	C. constricta 25 samples 56-130 μm 199?-2008	C. constricta 22 samples 56-125 μm 199?-2006