H. punctata, 64 µm

Hyalosphenia punctata Penard, 1891

Diagnose: shell transparent, colorless, yellow or brown, broad oval with a slit-like aperture; this aperture is nearly as broad as the shell; in side view the fundus is broadly rounded, tapering to the aperture, which can be open or closed; shell with an Arcella-like structure, composed of small organic building units; pseudostome with a narrow lip; plasma usually partly filling the shell, sometimes with some epipodia; nucleus globular with a large nucleolus.

Dimensions: Penard 55-90 µm, Opravilova 69-93 µm, Török 35-95 µm (mean 75 µm). My measurements 64-72 µm.

Ecology: this species has been found in very different types of water, like deep alpine lakes (Penard, 1891, 1902), swamps (Penard, 1902) and running waters (Opravilova, 1974,1980, Török, 2001. I have found this remarkable and rare species in the sediment of a ditch of the nature reserve Naardermeer in the Netherlands, where it occurred in considerable numbers. Food: bacteria, green algae and diatoms.

Remarks: Júlia Török (<2001) states that this species possibly belongs to the genus Nebela, because of its shell structure.

Hyalosphenia punctata
Hyalosphenia punctata, in side view
Hyalosphenia punctata, 72 µm
Hyalosphenia punctata, 68 µm
Hyalosphenia punctata, lateral view, one side is deformed
Hyalosphenia punctata, note the fine structure
Hyalosphenia punctata, with epipodia
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