world of amoeboid organisms

Menu
Mayorella augusta
Mayorella augusta, 320 µm

Mayorella augusta Schaeffer, 1926

Diagnosis: Locomotive form triangular, with parallel dorsal folds; narrow, with anterior end sometimes divided into two branches, Y-shaped; subpseudopodia usually present; nucleus spherical, with a central somewhat granular nucleolus; cytoplasmic crystals irregular or crystals attached to spherical bodies; many vacuoles; floating form more or less symmetrically, with a number of tapering pseudopodia.

Dimensions: Schaeffer: 250-350 µm; nucleus 18 µm (n=1). My measurements: 200-320 µm, nucleus 19-27 µm, crystals up to 4 µm.

Ecology: Freshwater, in Sphagnum bogs. The amoeba feeds on both algae and protists. It can capture and digest large prey like Difflugia tuberculata, Lesquereusia spiralis and Euastrum oblongum. It can survive for months in samples.

Remarks: Schaeffers description comes from one single specimen.

Mayorella augusta
Mayorella augusta
Mayorella augusta, crystals, and nucleus, 24 µm.
Mayorella augusta crystals
Mayorella augusta crystals
Mayorella augusta, crystals attached to spherical bodies.
Mayorella augusta
Mayorella augusta, dorsal folds.
Mayorella augusta
Mayorella augusta, splitting in Y-shape.
Mayorella augusta
A: Locomotive form; B: With large diatom; C: With Lesquereusia spiralis; D: Nuclei; E: Crystals; H: amoeba with Euastrum oblongum; F: Narrow locomotive form; G: Floating form (Drawings: Ferry Siemensma, 1987
Recent posts

Chlamydophrys-schaudinn

Fritz Schaudinn (1871 – 1906) was a German zoologist. He was the co-discoverer of the causative agent of syphilis and did research on amoebas, particularly

Read More »

Alabasta longicollis

Alabasta longicollis, after Penard, 1890 Alabasta longicollis  (Penard, 1890) Diagnosis: Test pyriform, very elongated (3 times as long as wide), transparent, very little compressed, embedded

Read More »

Alabasta kivuense

Alabasta kivuense, after Gauthier-Lièvre and Thomas, 1961 Alabasta kivuense  Gauthier-Lièvre and Thomas, 1961 Diagnosis: In frontal view, the test is finger-shaped with subparallel sides, the

Read More »

Paulinella micropora

Paulinella micropora, – from Lhee et al., 2017 Paulinella micropora Lhee, Yang, Kim, Andersen & Yoon, 2017 Diagnosis: Test elongate, with five columns of scales,

Read More »

Quadrulella tubulata

Quadrulella tubulata, after Gauthier-Lièvre, 1953 Quadrulella tubulata  Gauthier-Lièvre, 1953 Diagnosis: Shell almost lageniform, compressed, with rounded fundus and more or less irregularly arranged, commonly small,

Read More »

Quadrulella elongata

Quadrulella elongata, after Van Oye, 1952 Quadrulella elongata  Van Oye, 1952 Diagnosis: Test elongated with long neck and square plates, without any pores. Pseudosome slightly

Read More »