Testacealobosia: Arcellinida: Difflugina: Difflugiidae

Lesquereusia spiralis
(Ehrenberg, 1840)

Genus: Pseudostome lacks lobed collar; test round or oval in cross-section; pseudostome at end of bent neck; test more or less coiled or folded (Illustrated Guide, 1985).
Species: 95-190 μm long, 75-150 μm wide, 50-100 μm deep; test like flask, neck against body; with secreted imbedded siliceous particles; pseudostome circular 30-50 μm diam.

Lesquereusia, x 400, x 640, Aug. 7-13 1999, Vermont-Maine U.S.A., by Y. Tsukii
scale 50 μm scale 100 μm scale 150 μm; x 400 : scale 31 μm scale 63 μm scale 94 μm; x 640

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