world of amoeboid organisms

Menu

Difflugia Ovoid Group

Key characters:

  1. Test ovoid, in cross section rounded.
  2. Pseudostome circular.

1

Test with collar or short neck

2

1′

Test without collar or neck

5

2

Test > 60 µm

3

2′

Test < 60 µm

3

Collar or neck not clearly separated from the main body by a sharp incision

4

3′

Collar clearly separated from the main body by a sharp incision

4

Test 85-100 µm

4′

Test 78-140 µm

5

Aperture without thickened rim

6

5′

Aperture with thickened rim

6

Test < 60 µm

 

4

6′

Test > 60 µm

10

7

Test < 40 µm

8

7′

Test > 40 µm

9

8

Test with curved sides

8′

Test with more or less straight sides

9

Aperture with thickened rim

9′

Aperture without thickened rim

10

Test < 100 µm

11

10′

Test > 130 µm

11

Test elongate ovoid

12

11′

Test not elongate ovoid

14

12

Test elliptical

13

12′

Test with more or less straight sides

13

Test 47-59 µm

13′

Test 66-77 µm

14

Anterior region always with much larger particles​

14′

Test otherwise

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 »