world of amoeboid organisms

Menu
Penardeugenia
Elliptical aperture through which filopodia and conopodia extend

Genus Penardeugenia Deflandre, 1958

Diagnosis: Cells are flexible and covered with a thin sheath of scales which in light microscopy appear as a two-tiered layer that is usually adherent to the cell body. Individuals may or may not bear spines. Pseudopodia emerge from a highly flexible aperture. By far the most pseudopodia commonly point in the direction of movement (anterior), some are laterally directed, and only rarely some pseudopodia are pointed backwards. The pseudopodia are elongated, conical with a rounded tip, showing some resemblance to true filopodia. The nucleus is relatively large, apical, spherical, finely marbled when observed with DIC and contains one roundish, relatively small nucleolus in its center. No cysts or flagellated stages were observed.

Type species: Penardeugenia bathybioticus (Penard, 1904). Eugenia bathybioticus (homonym, was replaced by Deflandre (1958).

Ecology: herbivorous. Fresh water and soil, oligotrophic lakes, sediment, dry mosses.

Reference: Dumack, K., Siemensma, F., Bonkowski, M., 2018. Rediscovery of the Testate Amoeba Genus Penardeugenia (Thaumatomonadida, Imbricatea). Protist, 169, 1, 29-42.

Penardeugenia Weser
Flexible aperture (arrowheads)
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 »