world of amoeboid organisms

Menu

Genus Pessonella Pussard, 1973

Diagnosis: Locomotive form flattened and broadly lingulate or fan-shaped. Anterior margin clear with many cone-like bosses on hyaloplasm. Floating form with blunt, cylindrical, and frequently bent pseudopodia. No posterior uroid. Cytoplasm finely granular without crystals. Nucleus spherical with 3 to 5 parietal nucleolar pieces. Reported from freshwater and compost.
Monospecific.
Type species: Pessonella marginata Pussard, 1973

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 »