world of amoeboid organisms

Choanocystis pantopoda
From Siemensma, 1991

Choanocystis pantopoda (Penard, 1904) emend. Dürrschmidt, 1987
Syn.: Acanthocystis pantopoda Penard, 1904

Diagnosis: Periplast, ca. 60-70 µm in diameter, with two kinds of scales. Spine scales straight or slightly curved, 25-30 µm long, tapering slightly to a blunt apex with a toothed margin of 6 triangular teeth. Shaft, cylindrical and hollow, the sides are of irregular thickness (ca. 0.5 µm thick), basal sometimes with siliceous nodules. Base of the spine seated eccentrically on a heart-shaped base-plate, 1.5 µm in diameter. Plate scales patternless, elongated elliptical with a distinct median constriction, 3.5-4.0 x 2.3-2.5 µm.

Remarks: This species is easily recognized, with light- and electron microscopy, by the shape and size of the periplast and the extremely long, strongly built, spine scales, 1.5-2 times the cell diameter in length. C. pantopoda is distinguished from C. cordiformis on the basis of the length and breadth of the spine scales and the appearance of the plate scales, which are thicker than those of C. cordiformis.

Recent posts


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 »


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 »