Cyclopyxis leidyi
Cyclopyxis leidyi
Cyclopyxis leidyi and Trigonopyxis arcula

 

 

Family Trigonopyxidae Loeblich & Tappan, 1964

 

Diagnosis: Lobose testate amoebae with circular organic shell covered with fragments of mineral grains, diatoms and organic debris; aperture terminal, circular, oval, crescent-shaped or three or four lobed.

 

1

Test in oral view circular

2

-

Test elliptical

5

2

Aperture triangular, three-lobed, or irregular; always with thickened organic rim

Trigonopyxis

-

Aperture circular, irregular, crescent-shaped, or with > 5 lobes; never with thickened organic rim

3

3

Aperture crescent-shaped

Cornuapyxis

-

Aperture not crescent-shaped

4

4

Aperture invaginated

Cyclopyxis

-

Aperture not invaginated

Geopyxella