Genus: Test circular, ovoid or discoid; pseudostome eccentric, circular or ovoidal; with or without spines (Kudo, 1966).
Species: 53-85 μm long, 42-66 μm wide; 28-45 μm high; test oval, flattened toward pseudostome, hemispheroid laterally; pseudostome oval, 18-28 x 10-15 μm (Illustrated Guide, 1985).

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Test spherical or rounded
C. constricta 125 x 115 μm Mida-ga-hara 7 Gassan Yamagata, 2006	C. constricta 110 x 80 μm Mida-ga-hara 4 Gassan Yamagata, 2006	C. constricta 110 x 80 μm Jodo-daira 1 Azuma mt. Fukushima, 2006	C. constricta 100 x 85 μm Jodo-daira 3 Azuma mt. Fukushima, 2006
D. constricta 110 x 90 μm Tanohara marsh Shiga highland Nagano, 2006	C. constricta or C. aerophila ? 75 x 73 μm Kowashimizu Suwa Nagano, 2005	D. constricta 88 x 75 μm Chigo-ike 4 Shiga highland Nagano, 2006	C. constricta 80 x 60 μm Kannon-numa Shimogo Fukushima, 2005
D. constricta μm Shibayachi m.5 Odate Akita, 2007	C. constricta 66 x 50 μm Japan, 199?	C. constricta 56 x 47 μm Akigase Park Saitama, 2002	C. constricta 58 x 35 μm Nidanuma Tsuchiyu-onsen Fukushima, 2005
C. constricta ? 75 x 53 μm Yoshigadaira m. Kusatsu Gunma, 2005	C. constricta ? μm Karakemi m. Omachi Nagano, 2008
Test elongated
C. constricta or Centropyxiella ? 77 x 54 μm near Numa-no-hara Madarao highland Niigata, 2005	C. constricta or Centropyxiella ? 73 x 51 μm Numa-no-hara m. Madarao highland Niigata, 2005	C. constricta or Centropyxiella ? 77 x 54 μm Hakama marsh Madarao highland Niigata, 2005
C. constricta or Centropyxiella ? 103 x 68 μm Ichinose-enchi Norikura highland Nagano, 2005	C. constricta or Centropyxiella ? 93 x 60 μm near Yoshigadaira Shirane mountain Gunma, 2005	C. constricta or Centropyxiella ? 130 x 85 μm near Yamakado m. Nishi-Asai Shiga, 2008
Test posteriorly pointed
C. constricta ? 108 x 70 μm Japan, 199?	C. constricta ? 65 x 49 μm Tsuchiura Ibaraki, 2003	C. constricta ? 75 x 45 μm Tanohara Natural p. Ontake highland Nagano, 2005	D. constricta 140 x 80 μm Omotsubo m.1 Niimi Okayama, 2006
C. constricta 77 x 54 μm Kowashimizu Suwa Nagano, 2005

Similar species -->> Centropyxis aerophila; Centropyxiella;

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