world of amoeboid organisms

Menu
Key to Cyclopyxis species
1 Pseudostome star-shaped 2
Pseudostome circular 3
Pseudostome cross-shaped

C. crucistoma

2 Diameter of the test 335-400 microns

C. stellata

Diameter of the test 120-130 microns

С. grospietschi

3 Diameter of the test < 80 microns 4
Diameter of the test > 80 microns 9
4 Test completely covered with diatoms
C. bacillifera
Test covered with quartz particles 5
5 Test flattened, height/diam. ratio < 0.55 6
Test hemispherical (height/diam. > 0.55) 7
Test conical
C. tronconica
6 Diameter of pseudostome > 0.65 diameter of the test
C. plana
 
Diameter of pseudostome is 0.5-0.6 diameter of the test

C. amplecta

Diameter of pseudostome < 0.5 diameter of the test

C. aplanata microstoma

7 Height of test equal or larger than diameter 8
Height of test less than its diameter
C. eurystoma
8 Pseudostome strongly concave C. eurystoma sinuosa
Pseudostome slightly concave C. eurystoma alta
9 Test hemispherical, pseudostome relatively large, > 1/3 test diameter 8
Lateral sides of the test almost parallel; dorsal side in lateral view somewhat flattened, with large mineral particles often protruding from its sides; small mineral particles around the deep mouth

C. kahli

8 Test flattened 11
Pseudostome circular 13
11 The diameter of the mouth is about half the diameter of the shell 12
Diameter of mouth is not more than 1/4 of the diameter of the shell

C. aplanata microstoma

12
Diameter of the test 180-28 microns
С. aplanata
Diameter of the shell 130 microns C. eurystoma sinuosa
13 Diameter of the test 80-18 microns; pseudostome up to 1/2 the diameter of the test; surrounded by small, often shiny mineral particles, why it seems finely toothed

C. arcelloides

Diameter of the test 330-380 microns; pseudostome > 1/2 of test diameter

C. penardi

 

This key was published by Mazei and Tsyganov in 2006, Moskou, in Russian. I’ve translated it and modified it by adding some species.

Recent posts

Sphenoderia compressa

Sphenoderia compressa, after Badewitz, 2002 Sphenoderia compressa Badewitz, 2002 Diagnosis: Test ovoid, oval in cross section, hyaline, covered with relatively small, oval, rather irregularly arranged

Read More »

Tracheleuglypha elongata

T. elongata, A-C after Thomas and Gauthier-Lièvre, 1959; D after Van Oye, 1959 Tracheleuglypha elongata Van Oye, 1959 Diagnosis: Test similar to T. dentata, but

Read More »

Tracheleuglypha acolla

T. acolla, after Bonnet and Thomas, 1960 Tracheleuglypha acolla Bonnet and Thomas, 1955 Diagnosis: Test ovoid, non compressed, round in cross-section, with large oval overlapping

Read More »

Cyclopyxis kahli oblonga

C. kahli f. oblonga , after Tarnogradskii, 1959 Cyclopyxis kahli f. oblonga  (Tarnogradskii, 1959) Centropyxis kahli f. oblonga Tarnogradskii, 1959 Diagnosis:  Test with all the

Read More »

Cyclopyxis leclercqi

Cyclopyxis leclercqi – from Beyens and Chardez, 1986 Cyclopyxis leclercqi Beyens and Chardez, 1986 Diagnosis: Shell circular in apertural view, dorso-ventrally compressed with a swollen

Read More »

Haplomyxa saranae

Haplomyxa saranae Dellinger, 2014 Diagnosis: cell body from small rounded (0.1 mm) to large elongated shape (up to 3.5 x 0.3 mm), usually flat but

Read More »