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Lobosea: Testacealobosia: Arcellinida: Centropyxidae

 Centropyxis constricta
(Ehrenberg, 1841)

Centropyxis Genus: Test circular, ovoid or discoid; pseudostome eccentric, circular or ovoidal; with or without spines (Kudo, 1966).
Species: Test 120-150 x 75-100 μm, 60-75 μm in hight, pouch-shaped in oral view, round in lateral, tapered toward anterior; pseudostome 25-30 μm with incurved lips; several similar species (Illustrated Guide, 1985).

Centropyxis constricta (Ehrenberg) (or C. aerophila or Difflugia constricta), test 82 μm long, 50 μm wide, L/W=1.6, pseudostome 12 x 23 μm wide, x 640, a small wetland near Numa-no-hara marsh (Genseikaen), Madarao highland (Niigata & Nagano Pref.), Myoko village, Niigata Pref., Japan, May 15, 2005 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Centropyxis Centropyxis

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