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Lobosea: Testacealobosia: Arcellinida: Centropyxidae

Centropyxis aculeata
(Ehrenberg 1838)

Centropyxis aculeata Genus: Test circular, ovoid or discoid; pseudostome eccentric, circular or ovoidal; with or without spines (Kudo, 1966).
Species: Test variable in shape and size; diameter 100-150 μm; pseudostome 50-60 μm; with 4-6 spines (?); opaque or semitransparent; with fine sand-grains or diatom shells (Kudo, 1966). 138-200 μm in diameter, 48-60 height; several spines; pseudostome 30-60 μm, recurved, invaginated (Illustrated Guide, 1985).
Similar species -->> C. ecornis (lack spines)

Centropyxis sp., test μm long, μm wide, x 200, x 400, October 1999, Saitama Pref., Japan, collected by Y. Tsukii, photo by N. Kinoshita
scale 50 μm scale 100 μm scale 150 μm; x 400
Test 155 μm long, 153 μm wide, with 6 spines, x 400
Test 143 μm long, 150 μm wide, with 8 spines, x 400
Test 140 μm long, 143 μm wide, with 10 spines, x 400

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