Pseudoraphidocystis spec. (Olympus UPlanFL 100X Oil)

 

 

Pseudoraphidocystis cf. flabellata

 

Diagnosis: Periplast 10 µm, protoplast c. 5 µm; spine-scales umbrella-shaped, broad oval, 3.8 µm in diameter or smaller; with fine radiating ribs and a short stalk; no shaft; plate-scales very small, 0.77-1,2 µm long, elliptical, with small edge, no distinct structure.

 

Ecology: sediments of a shallow mesotrophic ditch, Gaasterland, the Netherlands (2014)

 

Remarks: This species may fall within the range of variation of P. flabellata.

 

Pseudoraphidocystis
Periplast, dried - SEM photomicrograph Eckhard Voelcker
Pseudoraphidocystis
Radial scales - SEM photomicrograph Eckhard Voelcker
Pseudoraphidocystis
Radial scales - SEM photomicrograph Eckhard Voelcker
Pseudoraphidocystis
Plate scale - SEM photomicrograph Eckhard Voelcker
Pseudoraphidocystis
Very small plate scales, arrowed. The plate scale in the right upper corner shows its bottom. - SEM Eckhard Voelcker
Pseudoraphidocystis
The same specimen in DIC
Pseudoraphidocystis
a small funnel shaped scale, b large funnel shaped scale