world of amoeboid organisms

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

Ferry Siemensma, created June 16, 2019; last modified December 12, 2021
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