Trachelocorythion
Trachelocorythion
Trachelocorythion spec.

Trachelocorythion spec.

Diagnosis: shell ovoid, compressed; aperture with a short collar, one lip slightly longer than the other one; shell composed of oval siliceous scales, being smaller close to the aperture; apertural scales not denticulated; nucleus relatively large, finely granular with centric or eccentric nucleolus; filopodia.

Dimensions: Length 50-68 µm, nucleus c. 10 µm (n=2).

Ecology: In sphagnum (Tirol, Austria) and sediments of a small stream (the Netherlands).

Remarks: This is a larger species than the one described by Penard. It differs from T. pulchellum by its larger size and the structure of the nucleus.

Trachelocorythion
The nucleus has a granular structure and an eccentrically situated nucleolus.
Trachelocorythion
Trachelocorythion
Nucleus, arrowed
Trachelocorythion
Trachelocorythion
Smaller scales near the aperture
Trachelocorythion
Trachelocorythion
Trachelocorythion
Trachelocorythion
Trachelocorythion
Specimen from the Netherlands, stacked image
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