world of amoeboid organisms

Menu
From Cavalier-Smith and Von der Heyden, 2007

Pterocystis devonica Cavalier-Smith and Von der Heyden, 2007

Diagnosis: radial scales (4-6 µm) with broad central rib tapering near the tip that has two asymmetric teeth (unlike striata), distally strongly curved to one side, and extending apically well beyond the lateral vanes, which have around 10 transverse ribs, but lack a distinctly thickened rim (unlike pteracantha and striata); base of shaft attached to a transverse thickening as in striata; wings with about 15-20 cross ribs, most resembling P. striata but wings have a different shape (being indented rather than bulging out distally) and extend only about one third up the scale (not over half way as in striata).
Plate scales oval (3-4 µm), sometimes slightly asymmetrical with central axial ridge.
Type locality: sediment, River Exe, Devon, UK.

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 »