world of amoeboid organisms

Menu
Sphenoderia fissirostris
Sphenoderia fissirostris
S. fissirostris

Sphenoderia fissirostris Penard, 1890

Diagnosis: Test ovoid, composed of four, usually transverse rows of large oval scales and a number of smaller scales at the fundus and near the pseudostome; the slit-shaped collar is covered with very small scales, which are hardly visible with lightmicroscopy.

Dimensions: Cash (1915): 28-45 µm long, 20-30 µm wide; pseudostome 8-16 µm; nucleus spherical 10-12 µm in diam. Hoogenraad & De Groot (1940): 28-34 µm; my measurements: 39-54 µm.

Ecology: in wet Sphagnum and other mosses.

Sphenoderia fissirostris
Sphenoderia fissirostris
S. fissirostris, right: lateral view
Recent posts

Polychaos spec.

Polychaos spec. Polychaos spec. Diagnosis: Large amoeba with an irregular more or less polypodial shape during slow locomotion; uroid finely papillated, usually very large fasciculate

Read More »

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 »