Key to Centropyxis
1
Test with one or more spines or outgrows; test sometimes without spines
2
–
Test smooth, without spines or outgrows
##
2
Pseudostome funnel shaped with a clear restriction between aperture and main body
6
–
Pseudostome not funnel shaped
4
3
Length of test 70-80 μm
–
Length of test 140-200 μm
4
Aperture a rounded square or cruciform
5
–
Aperture otherwise
6
5
Test pyriform in dorsal view
–
Test circular in dorsal view
6
Test in dorsal view irregular due to various outgrows and invaginations, pseudostome circular or elliptical
–
Test otherwise
7
7
In dorsal view test oval or pyriform
8
–
In dorsal view test more or less oval circular
10
8
In dorsal view test more or less oval
9
–
Test in dorsal view pyriform
9
Length of test 50-60 μm
–
Length of test 150-205 μm
10
Pseudostome with internal bridges or pilars
11
–
Pseudostome without internal bridges or pilars
##
11
The following species are difficult to distinghu
12
–
Test < 60 μm
12
The following species are difficult to distinguish from each other.
–
Spines 4-7, diameter 150-190 µm
–
Test 130 – 320 μm
–
Test 120-140 µm
–
Test 110-160 μm
13
Pseudostome lobed or dentated
14
–
Pseudostome not lobed or dentated
14
Spines very long (40-60 μm)
–
Spines shorter
15
15
Test diameter < 100 μm
13
–
Test diameter > 100 μm
15
–
Diameter of the test 80-90 μm
15
Diameter of the test 170-200 μm
–
Diameter of the test 140-160 μm, in lateral view hemispherical
5
Test in lateral view resembling a cap
6
–
Test in lateral view in the form of a rounded triangle
6
Spines along the entire fundus
–
Spines only located on the fundus
12
49
Spines are located on both the abdomen and on the visor
11
Spines very long, located not only on the fundus, but also on the visor
##
Test in lateral view flattened, rarely hemispherical
15
–
Test in lateral view semi circular or slightly smaller or larger than hemispherical
16
15
Test > 150 μm
16
Pseudostome very large (about half the diameter of the test), jagged
–
Pseudostome not so big, its edge is not jagged
17
17
Test with internal bridges
–
Bridges absent
18
18
Pseudostome slightly eccentric
19
–
Pseudostome strongly eccentric
20
19
Diameter of the test 140-170 μm
–
Diameter of test < 80 μm
20
Pseudostome small, close to the edge of the anterior part of the test
C. plagiostoma
–
Pseudostome larger, halfway between center and edge
21
21
Diameter of test 100-140 μm
–
Diameter of test < 70 μm
23
Test in lateral view similar in shape to the figure-eight by narrowing between the pseudostome and fundus
24
–
Test in dorsal view elliptical or ovate
30
24
Pseudostome subterminal, located at an angle of 30° with respect to the longitudinal axis of the test
–
Pseudostome located on the ventral side of the test
25
–
Spines only on the edge of the fundus
25
Test without spines
26
–
Test with spines
27
–
Main part of the test without diaphragma
27
Test in lateral view flattened, pseudostome located near the center of the ventral side; length of test 160-170 μm
–
Test in lateral view high, at least in the fundus, pseudostome very eccentric, length of test < 120 μm
28
28
Many spines, arranged randomly; visor turned outwards
29
–
One spine, long; visor not turned outwards
30
Posterior part in lateral view strongly curved inwards, forming a perforated diaphragm, separating the visor from the fundus
31
–
Test without a perforated diaphragm
32
31
Length of test 65-100 μm
–
Length of test 35-45 μm
C. sylvatica minor
–
Pseudostome narrow sickle-shaped, test in dorsal view ovoid
–
Pseudostome circular or ellipticalngth of test 35-45 μm
33
33
Test in lateral view high, height of the test is equal, slightly less or exceeds the width
34
–
Test in lateral view more flattened, height less than width
43
–
Height of the test approximately equal to the width of the test.
35
35
Test with spines
36
–
Test without spines
38
–
Spines a lot, are located throughout the fundus
37
37
Length of test 90-120 μm
–
Length of test 60-75 μm
–
Spines 4-8, test wider
38
Test length >110 μm
39
–
Test length < 90 μm
40
34
Height of the test considerably exceeds the width and length
39
Visor very wide, resembling the edge of a hat
57
Length of test > 200 μm, there is a wide visor in the form of the fields of a hat
–
Visor not so large, formed by very large grains of sand
40
Pseudostome subterminal, located at an angle of 45 ° to the longitudinal axis of the test
–
Pseudostome located on the ventral side of the test
41
41
In lateral view test in pseudostomal area almost not narrowed
46
Spines 1-6, elongated test
–
In lateral view test in pseudostomal area narrowed
42
42
Height of the test slightly exceeds the width
C. gibba inermis
–
Height of the test is slightly smaller than the width
43
Width of test exceeds the length
44
–
The width of test does not exceed the length
45
45
Pseudostome subterminal, located at an angle of 50-60° to the longitudinal axis of the test
46
–
Pseudostome ventrally located
47
47
Test with spines
48
–
Test without spines
53
48
A wide flat keel is located along the perimeter of the test, the outgrowth of which forms spines
–
Keel is absent
49
–
Spines only on the abdomen
50
–
Test dorsal view is oval, elliptical or ovate
51
51
There is a groove between the organic mouth area of the test and the posterior end
C. percolahiensis
–
Furrow absent
52
53
Length of test < 100 μm
54
–
Length of test > 100 μm
55
54
Test elongate elliptical in dorsal view; pseudostome circular or semicircular, large, occupies 1/3 part of the length of the test
–
The test is broad-elliptical in dorsal view, pseudostome convex in the front, straightly cut from the rear; visor is lined with large xenosomes
55
Test with internal bridges
56
–
Test without internal bridges
57
56
Ventral surface curved, pseudostome located almost at the center
–
Ventral surface flat, pseudostome eccentrically
–
Test smaller, visor not so wide
58
58
Pseudostome small, roundish, located at the bottom of a deep pre-oriental funnel
–
Pseudostome larger
59
59
There is a groove between the organic aperture of the test and the xenosomes on the posterior end
C. percolahiensis inermis
–
Groove absent, posterior end usually contains large sand grains
–
Test not completely covered with xenosomes; no spines present
Genus Conicocassis
