Microworld

world of amoeboid organisms

Menu
Thecamoeba striata

Genus Thecamoeba Fromentel, 1874

Diagnosis: Locomotive form, usually between 30 and 350 µm long, flattened and oblong in outline, often with several parallel folds or wrinkles. Anterior edge semi-circular with an extensive hyaloplasm that can occupy more than half the cell. Posterior edge often slightly convex, sometimes with a knob uroid. Form of the nucleus is an important diagnostic feature for delineating species, and thecamoebae can have a single spherical or ovoidal nucleus with a central nucleolus, granular nucleolus, or nucleolus as 2 or 3 parietal pieces. Cytoplasm may have crystals and contractile vacuoles. No cysts known.
At the ultrastructural level, nuclear envelope without an internal fibrous lamina and cell coat as a thick, dense, amorphous, glycocalyx.
Type species: Thecamoeba quadripartita Fromentel, 1874

Ecology: described from freshwater, terrestrial, and marine habitats.

Remarks: Common genus with 18 described species.

Thecamoeba striata n=nucleus
Thecamoeba
Thecamoeba
Drawings Ferry Siemensma
Recent posts

Zivkovicia compressoidea

Z. compressoidea, a-b after Chardez, 1958; c after Jung, 1942 Zivkovicia compressoidea  (Jung, 1942) new.comb. Basionym: Pontigulasia compressoidea Jung, 1942 Diagnosis: Shell ovoid and compressed,

Read More »

Zivkovicia flexa

Z. flexa, from Cash and Hopkinson, 1909 Zivkovicia flexa  (Cash and Hopkinson, 1909) Ogden, 1983 Basionym: Pontigulasia compressa var. flexa  Cash and Hopkinson, 1909 Diagnosis:

Read More »

Lagenodifflugia epiouxi

L. epiouxi, after Chardez, 1984 3 Lagenodifflugia epiouxi (Chardez, 1983) new comb. Basionym: Pontigulasia epiouxi Chardez, 1983 Diagnosis: Shell elongate, circular in cross-section or very

Read More »

Centropyxis lapponica

Centropyxis lapponica, after Grospietsch, 1954 Centropyxis lapponica  Grospietsch, 1954 Diagnosis: Shell nearly circular in circumference, without spines. Aperture clear square with rounded corners. Shell viewed

Read More »

Chaos spec. 6

Chaos spec., Crailoo, 2021 Chaos spec. This specimen was found in a samples from Crailoo, Netherlands. It was remarkable because of the absence of crystals.

Read More »

Bullinularia maxima

Bullinularia maxima – from Bobrov and Mazei, 2020 Bullinularia maxima Bobrov et Mazei, 2020 Diagnosis: Shell brown, opaque, elliptical in ventral view; ventral surface is

Read More »

Bullinularia macroporum

Bullinularia macroporum – from Bobrov and Mazei, 2020 Bullinularia macroporum Bobrov et Mazei, 2020 Diagnosis: Shell yellow-brownish, transparent, circular in ventral view; ventral surface is

Read More »

Nebela golemanskyi

N. golemanskyi, after Todorov, 2010 Nebela golemanskyi Todorov, 2010 Diagnosis: Shell large, colourless and pyriform, with a distinct short neck about one fourth of the

Read More »

Nebela nebeloides

N. nebeloides, after Gauthier-Lièvre and Thomas, 1958 Nebela nebeloides (Gauthier-Lièvre and Thomas, 1958) Todorov et al., 2010 Basionym: Difflugia nebeloides Gauthier-Lièvre and Thomas, 1958 Diagnosis:

Read More »