Microworld

world of amoeboid organisms

Menu
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).

Recent posts

Kibisidytes

K. marinus, after Jepps, 1934 Kibisidytes marinus Jepps, 1934 Diagnosis: Small amoeboid organism occurring in the sea, attached to the surface film or to some

Read More »

Phaeobola

P. aeris from Dumack et al., 2000 Phaeobola Dumack et al., 2000 Diagnosis: Cells roundish to oval shaped. Shell colorless to amber-colored, rough surface, few

Read More »

Rhizaspis armata

R. armata, 68 µm long, excl. spines – Laegieskamp Rhizaspis armata (Lauterborn, 1901) Dumack et al., 2021 Basionym: Pamphagus armatum Lauterborn, 1890 Diagnosis: Theca membranous,

Read More »

Rhizaspis spinosa

The original description with original drawings, Penard, 1890. Rhizaspis spinosa (Penard, 1890) Dumack et al., 2021 Basionym: Trinema spinosum Penard, 1890 Diagnosis: Theca membranous, ovoid

Read More »

Difflugia “pseudoclaviformis”

Difflugia “pseudoclaviformis”, front and side view, 424 µm Difflugia “pseudoclaviformis” Diagnosis: Shell pyriform, compressed, with a more or less pronounced aboral protuberance; shell composed of

Read More »

Difflugia from Lolo Pass

Shells 461-448 µm, stacked image. I found this large en remarkable shells in sediment of a small mountain lake near Lolo Pass, Montana USA. It differs

Read More »

Foraminifer drome

Unknown species, collected from the river Drôme, France, 2021 Unknown species September 2021, I found about ten specimens of an agglutinated foraminifer in a sample

Read More »

Cyclopyxis spec

Cyclopyxis spec., 168 µm Cyclopyxis spec. Diagnosis: Shell circular in ventral and dorsal view, more or less hemispherical in lateral view (height/diameter ≈ 0.5); lateral

Read More »

Difflugia fallax

Difflugia fallax, from Penard, 1902 Difflugia fallax Penard, 1890 Diagnosis: Shell hyaline or yellowish-greenish, black at low magnification, round in cross section, formed of a

Read More »