Korotnevella
Korotnevella species

Genus Korotnevella Goodkov, 1988

Diagnosis: Length of locomotive form up to 120 µm. Similar in appearance to Mayorella, but less likely to lack blunt digitiform pseuodopodia extending from the anterior hyaline region. Floating form with slender radiating pseudopodia, frequently bent, extending from a more or less spherical central mass. Nucleus in some with lobed or irregular nucleolar material occasionally giving the impression of a binucleate cell. Cytoplasm without crystalline inclusions.
Cell surface covered in complex boat-like microscales, up to 700 nm long, discernible with EM. Some microscales with prominent terminal spikes.
Type species: Korotnevella bulla (Schaeffer, 1926) Goodkov, 1988

Ecology: Freshwater and mesohaline ecosystems.

Remarks: Two genus names, Dactylamoeba Korotnev, 1880 and Korotnevella Goodkov, 1988, are in current use. The latter name is preferred, pending rediscovery and characterization of Dactylamoeba elongata Korotnev, 1880, the type species of the genus. Korotnevella species can be divided into three groups on the basis of scale morphology, suggesting that the genus may not be monophyletic.

Korotnevella species completely covered with scales – SEM micrograph Eckhard Voelcker
Korotnevella species, detail of the image above – SEM micrograph Eckhard Voelcker
Korotnevella
Korotnevella species, scales – SEM micrograph Eckhard Voelcker
Korotnevella species
Korotnevella species
Korotnevella species
Recent posts

Microcorycia spec. 4

Microcorycia spec. , folded Microcorycia spec.? I found this specimen in a sample from moss on a fallen tree in a marsh in the Naardermeer,

Read More »

Microchlamys spec.

Microchlamys spec., the same cell in lateral view Microchlamys spec. Diagnosis: Shell relatively high compared with all described species. The diameter is twice the height.

Read More »

Excentrostoma

Infraorder Excentrostoma Kosakyan et al., 2016   Diagnosis: Testate amoebae with an eccentrically placed aperture; test organic with few or many xenosomes. Family Centropyxidae Jung, 1942  

Read More »

Longithecina

Infraorder Longithecina Kosakyan et al., 2016   Diagnosis: Testate amoebae with a more or less tubular or cylindrical test and a terminal aperture; test with

Read More »