world of amoeboid organisms

Clathrella foreli
Clathrella foreli, with nucleus, plasmabody 36 µm, scales about 16 µm – Naardermeer

Clathrella foreli Penard, 1903

Diagnosis: Cell spherical, surrounded by a number of hyaline, colorless, bowl-shaped scales, loosely attached to each other. Filopodia extend through gaps between the scales. Pseudopodia branching and when attached to the substrate also anastomosing. One vesicular nucleus.

Dimensions: Penard: mean 40-55 µm for adult amoebae. Hoogenraad & De Groot (1940): 40-50 µm. My measurements 25-86 µm, mean 35 µm (only the body without scales!). Scales about 9.8-16 µm in diameter, nucleus 8.2-16 µm.

Ecology: Oligotrophic and mesotrophic fresh water. Europe, North- and South-America, Japan, India.

Remarks: For more information, see my paper in Mikrokosmos (Siemensma, 2014)

Two specimens from Crailoo, a mesotrophic freshwater pond
Surface structure
Clathrella foreli
Clathrella foreli, n=nucleus, plasmabody 30 µm, scales about 14 µm – Peru, rainforest lagoon.
Clathrella foreli
Clathrella foreli, 31 µm, nucleus clearly visible.
Clathrella foreli
Specimen showing the polygonal structure of the scales and the branching and anastomosing filopodia.
Clathrella foreli
The arrow points to a gap between the scales through which pseudopodia pass.
Clathrella foreli
Specimen with many branching pseudopodia
Clathrella foreli
Clathrella foreli
Clathrella foreli
Clathrella foreli, 30 µm – Peru, feeding on diatoms
Clathrella foreli
Clathrella foreli
Empty shell
Clathrella foreli
Clathrelli foreli Ferry Siemensma
Clathrella foreli, dried shell, from Naardermeer and Peru
Clathrella foreli
Clathrella foreli
Clathrella foreli, 32 µm, Naardermeer
Clathrella foreli
Clathrella foreli, 32 µm, Naardermeer
Clathrella foreli, body 40 and 32 µm, Montana USA
Ferry Siemensma, created March 1, 2019; last modified October 19, 2021
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