Lecythium spec. a lateral view; b pseudostome with broad pliable collar; c optical cross section

 

Lecythium spec.

Diagnosis: test in lateral view broad elliptical or ovoid; in dorsal view circular; membane hyaline, yellowish to brown, covered with minute xenosomes; vesicular nucleus in the dorsal region; filopodia straight, branching and anastomosing, usually numerous; pseudostome flexible; membrane around the aperture pliable and flexible.

Dimensions: my measurements 20-40 µm; nucleus c. 12 µm (hard to detect).

Ecology: I found this species in sediments of the Spiegelplas and an oligotrophic fen near Kootwijk in the Netherlands. It looks like a Lecythium species, but it could also be a Pseudodifflugia. It also resembles Pleurophrys amphitremoides Archer, 1870, which is about 60 µm. It could alsobelong to the genus Schwabia Jung (1942).

Lecythium
Two specimens, probably dividing.
Lecythium
Specimen with typical pseudopodial network.
Lecythium
Specimen with typical pseudopodial network.
Lecythium
Lecythium
Cell with nucleus and cell with aperture visible.
Lecythium
Surface structure of the test. Shell 25 µm, oligothrophic fen – Kootwijk, the Netherlands
Lecythium
Two cells after dividing, still connected by a long string.
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