Plagiophrys spec.

Specimen with longitudinal division, with the older part at the left, and the newer one with a developing collar - eutrophic ditch, floating debris - Horstermeer.

 

 

Rhizaspis scutiformis var. marginata (De Groot, 1979)

 

This variety was listed and depicted by De Groot without any further diagnostic description. I find it regularly, but it's not clear if this form falls within the variation range of R. scutiformis.

 

Plagiophrys spec.

Impression of the longitudinal division of a specimen. a: photomicrograph; b: start of division, the new veil becomes visible; c: the cell divides and d: the cells has separated (b-c: drawings Ferry Siemensma). Below two images which show the same cells in aboral view.
Plagiophrys scutiformis
Plagiophrys scutiformis
The above specimen in division, viewed from above.

Plagiophrys spec.

Test 87 µm - Gaasterland.

Plagiophrys marginata

 

Arrow points to a lateral wing.

Plagiophrys marginata

Plagiophrys marginata

Plagiophrys marginata