Re-isolation and revaluation of boundaries of Thecamoeba terricola Greeff, 1886 (Amoebozoa, Discosea, Thecamoebida), with description of Thecamoeba vicaria n. sp.

We studied a large species of Thecamoeba found in a glass dish with soaked moss and obtained 18s rRNA gene sequence of this organism. Morphologically, the strain was most similar to T. terricola sensu Page, but had significant differences in cell size and nuclear morphology.

Stenamoeba aeronauta n. sp., a new case of sibling species in the order Thecamoebida (Amoebozoa, Discosea).

A new speciesStenamoeba aeronautan. sp.was isolated from a culture of large thecamoebids during laboratory studies.

Thecamoeba vumurta n. sp. (Amoebozoa, Discosea, Thecamoebida) from freshwater pond sediment - a sibling species of T. striata (Penard, 1890) Schaeffer, 1926.

Until recently, it seemed that amoebae of the genus Thecamoeba could be reliably identified using light-microscopic characters. However, recent studies show the presence of sibling species in the genus Thecamoeba, which can only be reliably distinguished based on the molecular data. Here we describe a new freshwater species, Thecamoeba vumurta n.

Thecamoeba astrologa n. sp. - A new species of the genus Thecamoeba (Amoebozoa, Discosea, Thecamoebida) with an unusually polymorphic nuclear structure.

Thecamoeba astrologa n. sp. was isolated from a plant litter sample.

Vannella primoblina n. sp. - an unusual species of the genus Vannella (Amoebozoa, Discosea, Vannellida) with pronounced dorsal ridges and folds.

Amoebae of the order Vannellida (Amoebozoa, Discosea) have a fairly recognizable spatulate, fan-shaped or semi-circular outlines and a wide area of frontal hyaloplasm. They can be easily distinguished from the other groups of lobose amoebae even by light microscopy. The dorsal side of these amoebae is usually smooth and rarely bears ridges or folds, which are never numerous or regular.