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