world of amoeboid organisms

Menu
Arcella intermedia
Arcella intermedia

Arcella intermedia (Deflandre, 1928) Tsyganov & Mazei 2006

Diagnosis: shell colorless, light yellow or brown, circular in apertural view, domed or hemispherical with an implicit basal border in lateral view. Apertural surface and basal border are smooth, but the dorsal surface has a number of regular depressions. Aperture circular with or without a distinct collar.

Dimensions: Shell diameter 65-75 μm, shell height 35-50 μm, aperture diameter 16-23 μm. Aperture diameter/shell diameter 0.35-0.55; shell height/diameter ratio 0.5-0.7. My measurements: shell diameter 52-71 μm.

Ecology: Fresh water, between algae and on the debris of shallow waters.

Remarks: This species belongs to the species complex of A. hemisphaerica, A. rotundata and A. gibbosa with all their described varieties.
See Tsyganov and Mazei, 2007.

Arcella intermedia
Arcella intermedia, lateral view
Arcella intermedia
Arcella intermedia, lateral view
Recent posts

Sphenoderia compressa

Sphenoderia compressa, after Badewitz, 2002 Sphenoderia compressa Badewitz, 2002 Diagnosis: Test ovoid, oval in cross section, hyaline, covered with relatively small, oval, rather irregularly arranged

Read More »

Tracheleuglypha elongata

T. elongata, A-C after Thomas and Gauthier-Lièvre, 1959; D after Van Oye, 1959 Tracheleuglypha elongata Van Oye, 1959 Diagnosis: Test similar to T. dentata, but

Read More »

Tracheleuglypha acolla

T. acolla, after Bonnet and Thomas, 1960 Tracheleuglypha acolla Bonnet and Thomas, 1955 Diagnosis: Test ovoid, non compressed, round in cross-section, with large oval overlapping

Read More »

Cyclopyxis kahli oblonga

C. kahli f. oblonga , after Tarnogradskii, 1959 Cyclopyxis kahli f. oblonga  (Tarnogradskii, 1959) Centropyxis kahli f. oblonga Tarnogradskii, 1959 Diagnosis:  Test with all the

Read More »

Cyclopyxis leclercqi

Cyclopyxis leclercqi – from Beyens and Chardez, 1986 Cyclopyxis leclercqi Beyens and Chardez, 1986 Diagnosis: Shell circular in apertural view, dorso-ventrally compressed with a swollen

Read More »

Haplomyxa saranae

Haplomyxa saranae Dellinger, 2014 Diagnosis: cell body from small rounded (0.1 mm) to large elongated shape (up to 3.5 x 0.3 mm), usually flat but

Read More »