Dermamoeba
Dermamoeba algensis - courtesy A. Smirnov

 

 

Genus Dermamoeba Page & Blakey, 1979

 

Diagnosis: Locomotive form oval or elongate, up to 85 µm in length, with frequent narrowing of the anterior end. Extensive hyaline zone, often extending posteriorly along the margins. Surface of cell smooth, but, when present, morulate uroid gives rise to surface folds at the posterior. Nucleus frequently with a pair of central bodies. Cytoplasm can have yellow/brown inclusions; feeds on fungi and other microbes in the soil. Cysts in at least one of the 2 described species.
Type species: Dermamoeba granifera (Greeff, 1966)

Three known species:

D. granifera

D. minor

D. algensis

 

 

Dermamoeba algensis  Smirnov, Bedjagina and Goodkov, 2011

 

Diagnosis: Amoeba of lingulate morphotype; length in locomotion 50–100 µm (average 75 µm); breadth 30–50 µm (average 37 µm); length/breadth ratio 1.4–2.8 (average 2.0). Single vesicular nucleus 2.9–5.7 µm in diameter (average 4.7 µm) with the single central nucleolus 1.4–4.6 µm in diameter (average 3.2 µm). The nucleolus contains a number of lacunae. Cell coat ca. 500 nm in thickness. Cysts rounded, single-walled, 47–70 µm diameter (average 58 µm); cyst wall is smooth, no cyst pores.

 

Ecology: small freshwater pond close to Kirovsk village
(North-Western Russia).