Placocista lens
Placocista lens, in lateral view (left) and frontal view

 

Placocista lens (Penard, 1899)

Diagnosis: shell broad, ovoid, strongly compressed, with acute lateral border; shell edge smooth, without spines; shell composed of many small scales; along the aperture is an area covered with very minute scales; aperture a broad but very flattened slit, biconvex; nucleus spherical, with fragmented nucleolar material; filopodia.

Dimensions: Length 81 µm, L/B = 0.8, scales ca. 12 µm.

Ecology: Rare. I have found one specimen in 1979 in a sample from the Dammerkade, Ankeveen, one in 2011 in a sample from a small river in Neer, Zuid-Limburg, and one in the Laegieskamp (2013), all in the Netherlands.

Remarks: This species has never been recorded by Hoogenraad & De Groot (1940) for the Netherlands.

Placocista lens
Drawing Ferry Siemensma
Placocista lens
Penard (1905) in Les Sarcodines des Grands Lacs.
Placocista lens
Placocista lens, with real ‘rhizopodia’; note the broad aperture.
Placocista lens
Placocista lens
Placocista lens
Placocista lens
Placocista lens
Placocista lens
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 »