world of amoeboid organisms

Menu
Lesquereusia gibbosa
L. gibbosa, after Thomas and Gauthier-Lièvre, 1959

Lesquereusia gibbosa Thomas et Gauthier-Lièvre, 1959

Diagnosis: At the base of the neck there is a clear constriction, indicating an internal diaphragm placed at about half the width of the test. On both sides of the constriction, along the dorsal contour, there are two more or less protruding ridges.

Dimensions: Length 120-150 µm; width 100-140 µm; pseudostome 28-35 µm.

Ecology: Freshwater. Shallow clear ponds. Africa.

Remarks: Thomas and Gauthier-Lièvre: ‘The examined populations had varied coverings which are not without analogy with those which one observes in L. modesta: grains of quartz mixed with reworked more or less vermiculated xenosomes, which are elongated scales (transformed diatoms?), polygonal scales more or less imbricated on the edges, reshaped quartz grains, etc. Despite the analogy of form and covering with L. modesta, we believe that the tendency to form an internal diaphragm deserves to be taken into consideration; we base the creation of our species on this character. Let us also note that we found in our samples different variations in the morphology of the test: these are the classical variations that we observed in the different species, but they are always linked to the presence of the diaphragm.’

Thomas and Gauthier-Lièvre, 1959, distinguished some varieties, see below.

Reference: Thomas, R. et Gauthier-Lièvre, L., 1959: Le genre Lesquereusia Schlumberger 1845 (Rhizopodes testacés). Bull. Soc. d’Hist. Nat. l’Afrique du Nord, 388, 50: 34-86.

Lesquereusia gibbosa
L. gibbosa var. nodosa, after Thomas and Gauthier-Lièvre, 1959
Lesquereusia gibbosa
L. gibbosa, a-f. var. incisa; g. var. corniculata – after Thomas and Gauthier-Lièvre, 1959
Recent posts

Yogsothoth knorrus

Yogsothoth knorrus, after Shishkin and Zlatogursky, 2018 Yogsothoth knorrus Shishkin and Zlatogursky, 2018 Diagnosis: Individual cells in colony have a diameter of 5.53-13.26 µm; they

Read More »

Yogsothothidae

Yogsothoth carteri, from Shishkin and Zlatogursky, 2018 Yogsothothidae  Shishkin and Zlatogursky, 2018 Diagnosis: Centrohelids covered with two types of tangentially-oriented plate-scales, having a different morphology.

Read More »

Acanthocystis dürrschmidtidae

A. dürrschmidtidae – after Wujek, 2003 Acanthocystis dürrschmidtidae  Wujek, 2003 Diagnosis: Cells 35-40 µm (based on a whole mount). Periplast comprising scales of two types, plate

Read More »

Centroplasthelida

Centroplasthelida Febvre-Chevalier and Febvre, 1984   Diagnosis: Phagotrophic and non-photosynthetic protists with one large spherical or near spherical centrosome at the center of the cell

Read More »

Pterocystida

  Pterocystida Cavalier-Smith and Heyden, 2007 stat. n.   Phylogenetic diagnosis: The least inclusive clade, containing Pterocystis devonica, Raphidiophrys heterophryoidea and Choanocystis curvata, but not Acanthocystis

Read More »

Panacanthocystida

Panacanthocystida Shishkin et Zlatogursky, 2018   Diagnosis: Centrohelids usually covered with siliceous scales or with organic spicules: scale-bearing species with both inner plate-scales and outer

Read More »