Corythium dubium
Corythion dubium
Corythium dubium, 35 µm

 

Corythion dubium Taranek, 1871

Diagnosis: shell ovoid, composed of approximately four hundred oval shell-plates, irregularly arranged, very small and usually overlapping each other; aperture sub-terminal, oval and invaginated; about thirty small, oval, apertural-plates surround the aperture, each carrying a median dorsal tooth.

Dimensions: Length 33-43 µm; breadth 25; mouth 10 µm; shell-plates length 2.9-3.4, width 1.5-1.9; diameter of apertural-plates 0.9-1.1 µm.

Ecology: Sphagnum and mosses.

Remarks: The apertural-plates are similar to those seen in Trinema enchelys and T. lineare. Differences in the size of the shell are illustrated by Cash et al., (1915).

Corythion dubium
Morphometry of Corythion dubium in one sample from a Sphagnum bog in Amersfoort, the Netherlands. Three groups can be distinguished. The left shell represents the middle group and is 35 µm long, the other shell is 56 µm and represents the population to the right.
Corythion dubium, 39 µm
Corythium dubium
Corythion dubium, with small scales visible
Corythium dubium
Corythion dubium, 35 µm, nucleus visible
Corythium dubium
Corythion dubium
Left: Shell 37 µm, in moss on a roof; Right: from Ogden, 1980
Recent posts

Microcorycia spec. 4

Microcorycia spec. , folded Microcorycia spec.? I found this specimen in a sample from moss on a fallen tree in a marsh in the Naardermeer,

Read More »

Microchlamys spec.

Microchlamys spec., the same cell in lateral view Microchlamys spec. Diagnosis: Shell relatively high compared with all described species. The diameter is twice the height.

Read More »

Excentrostoma

Infraorder Excentrostoma Kosakyan et al., 2016   Diagnosis: Testate amoebae with an eccentrically placed aperture; test organic with few or many xenosomes. Family Centropyxidae Jung, 1942  

Read More »

Longithecina

Infraorder Longithecina Kosakyan et al., 2016   Diagnosis: Testate amoebae with a more or less tubular or cylindrical test and a terminal aperture; test with

Read More »