world of amoeboid organisms

Menu
Microcometes paludosa

Genus Microcometes Cienkowsky, 1876

Diagnosis: Shell hyaline, usually dark brown, small, with one side fastened to the substrate; outline polygonal, irregular; shell with three to five apertures, with or without short necks. Pseudopodia very thin, granular, branching. Usually with two short cilia. Nucleus globular with a central nucleolus. Three to six contractile vacuoles.

Type species: Microcometes paludosa Cienkowski, 1876

Dimensions: De Saedeleer (1934): shell 6.8-17 µm. My measurements: 9.0-11.2 µm.

Ecology: freshwater; bacterivorous.

Remarks: The two cilia are easily overlooked and even the filopodia are hard to detect. Because of these cilia, this genus has been moved to the heterotrophic ciliates.

De Saedeleer (1934) describes two species, Microcometes paludosa and M. aculeata, with short spines. The latter has originally been described by Lauterborn (1908) as M. paludosa var. aculeata.

Microcometes paludosa is not rare, but usually not easy to discover in fresh preparations. Best is to keep preparations in moist chambers and to scan them regularly. Specimens mostly attach to the cover glass and are easily visible because of the dark brown color.

Click here for the original description of Cienkowski.

Microcometes paludosa - Ferry Siemensma
Microcometes paludosa
Microcometes paludosa - Ferry Siemensma
Microcometes paludosa with three apertures
bar = 10 µm
Microcometes paludosa
Microcometes paludosa – Photomicrograph: Yana Egli
Recent posts

Spiculophrys

Genus Spiculophrys Zlatogursky, 2016 Diagnosis: Centrohelids lacking silica scales but with numerous thin, pointed organic (without any traces of silica) scales tapering towards acute apices. 18S

Read More »

Acanthocystis drakena

From Zlatogursky, 2016 Acanthocystis drakena Zlatogursky, 2016 Diagnosis: Cells are 21.1-30.5 µm (ca. 26.7) in diameter. Cell is covered with oval plate-scales having a margin

Read More »

Choanocystis symna

From Zlatogursky, 2014 Choanocystis symna Zlatogursky, 2014 Diagnosis: Cell body ca. 6.7 µm in diameter. Axopodia three–five times longer than a cell diameter. Plate-scales dumbbell-shaped

Read More »

Acanthocystis costata

From Zlatogursky, 2014 Acanthocystis costata Zlatogursky, 2014 Diagnosis: Cell body ca 9.5 µm in diameter. Axopodia 2–3 times longer than cell diameter. Length of spine-scales

Read More »

Kinetocyst

Left: ultra-structure of a kinetocyst of Raphidiophrys contractilis); right: two kinetocysts in an axopodium. Kinetocysts In centrohelid heliozoa, extrusomes are called kinetocysts, and are present

Read More »

Yogsothoth carteri

Yogsothoth carteri, after Shishkin and Zlatogursky, 2018 Yogsothoth carteri Shishkin and Zlatogursky, 2018 Diagnosis: Individual cells in a colony have a diameter of 9.7-15.2 µm;

Read More »