Campascus minutus, 70 µm – Hochfilzen, Austria
Campascus minutus Penard, 1902
Diagnosis: shell broadly ovoid, in cross-section circular; neck cylindroid, strongly curved; fundus rounded; aperture circular, surrounded by a characteristic hyaline collar; shell composed of an organic material, embedded with amorphous, siliceous scales, irregularly arranged; nucleus ovular.
Dimensions: Penard 50-60 µm (mean); my measurements 64-71 µm.
Habitat: fresh water; I found this species in peat bogs in the Laegieskamp and the Naardermeer, both in the Netherlands and in Tirol, Austria. It is apparently of wide geographic distribution, having been reported from Switzerland, Germany, England, Scotland, Czechoslovakia and the U.S.A. (New York).
Campascus minutus, 70 µm – Tirol, Austria
Campascus minutus, 62 µm – Laegieskamp, The Netherlands
Campascus minutus, 62 µm – Laegieskamp, The Netherlands
Campascus minutus, 68 µm, shell structure – Hochfilzen, Austria
Campascus minutus, hyaline collar is arrowed – Naardermeer, The Netherlands
The same specimen as above, in side view
Campascus minutus, 64 um, shell structure – Hochfilzen, Austria
Campascus minutus – After Nicholls, 2003
Campascus minutus – in SEM the hyaline collar has disappeared – from Badewitz, 2003
Campascus minutus, detail – SEM from Badewitz, 2003