world of amoeboid organisms

Menu
from Cavalier-Smith and von der Heyden, 2007

Pterocystis polymorpha Cavalier-Smith and von der Heyden, 2007

Diagnosis: radial scales (3-4 µm) non-striated, lacking transverse ribs, polymorphic, ranging from ovate without a pointedtip (axial rib falls short of apex, unlike P. ovata), but midrib not extending into a long drawn out cuspidate tip, and dense thickening well away from the base of the scale (about one third along its length), which is
much more distinctly rounded than in contorta, to very different strongly cuspidate scales where the tip is much more strongly twisted to one side than in P. contorta.
Tangential plate scales (1-2 µm) markedly asymmetric, almost flat on one side, with central axial ridge, but no radial furrowing.
Distinguished from P. ovata by its more strongly asymmetric plate scales and the non-cuspidate radial scales having more rounded tips.
Type locality: lake sediment, Priest Pot, Cumbria, 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 »