1	Cross-section of shell and aperture are round	3
1’	Shell and aperture are different	2
2	Cross-section of shell elliptical, aperture round	33
2’	Cross-section of shell elliptical, aperture elliptical	48
2''	Shell not round or elliptical, but more or less flattened, especially at the anterior part; with a curved mouth	E. symoensi
3	Shell with spines, which are outgrowths of the scales	4
3’	Shell without spines	22
4	Spines located exclusively in the anterior, middle or apical part of the shell (they can be collected in a bundle or tuft)	5
4’	Spines more or less evenly distributed over the entire surface of the shell	11
5	Spines directed backwards located in the anterior or middle part of the shell	6
5’	Spines located in the apical part of the shell	7
6	Spines located in the anterior part of the shell	E. brachiata
6’	Spines located in the middle part of the shell	E. brachiata librata
7	Spines in the apical part are few (=< 2)	8
7’	Spines in the apical part are numerous (> 2), bundled in a tuft	10
8	Shell length < 100 µm	9
8’	Shell larger than	E. mucronata
9	Shell ovoid	E. acanthophora cirrata
9’	Shell cylindrical	E. cristata acicularis
10	Shell cylindrical, with a slightly marked neck	E. cristata
10’	Shell lanceolate, without narrowing or neck	E. cristata lanceolata
11	Body scales round or oval with a smooth edge	12
11’	Body scales have a papillary formation on the anterior and posterior edge, which can be located in a small notch	14
12	Apertural scales with one medial and 4-5 lateral teeth	16
12’	Scales of different shape	13
13	Apertural scales pointed, entire	E. gauthieri
13’	Apertural scales semicircular, finely toothed	E. hutchinsoni
14	Papillary formation on body scales located in shallow notches	15
14’	Notches absent, shell elongated ovoid	E. crenulata minor
14''	Notches absent, shell almost spherical	E. cabrolae
15	Shell elongated-ovate	E. crenulata
15’	Shell cylindrical	E. crenulata elongata
16	Spines directed forward	E. acanthophora equeis
16’	Spines directed backwards	17
17	Curved spines	E. acanthophora flexuosa
17’	Straight spines	18
18	Spines of different lengths	E. acanthophora heterospina
18’	Spines identical	19
19	Number of spines not more than 2	E. acanthophora deflandrei
19’	More than 20 spines	20
20	Short spines	E. acanthophora brevispina
20’	Long spines	21
21	Shell ovoid	E. acanthophora
21’	Shell cylindrical	E. acanthophora cylindrасеа
22	Body scales round or oval without notches or papillae	25
22’	Body scales have notches or papillary formations	23
23	Shell more than 100 µm long, the anterior edge of the body scales is flat, bears a rounded and shallow notch, the posterior edge has a raised, pointed thickening in the form of a rib	E. aspera
23’	Shell less than 100 µm long, body scales have papillary formations	24
24	The papillary formation is located only on the anterior edge of the body scales	E. scutigera
24’	The papillary formation is located both on the anterior and posterior margins of the body scales	E. crenulata minor
25	Apertural scales are polygonal	26
25’	Apertural scales are oval	28
26	Apertural scales are rhombic	27
26’	Apertural scales are hexagonal	E. hyalina
27	Shell length less than 70 µm	E. cristata decora
27’	Shell length more than 70 µm	E. cristata major
28	Apertural scales are oval with a small triangular medial tooth and 4-5 lateral	29
28’	Apertural scales are drop-shaped, consisting of two parts: a small oval one directed into the lumen of the aperture and bearing 5 small spines, and a large oval one attached to the body scales	E. capsiosa
29	Shell oval	30
29’	Shell shape different	31
30	Shell length is less than 40 µm	E. tuberculata minor
30’	Shell is more than 40 µm long	E. tuberculata ovoidea
31	Shell curved in the area of the mouth	E. tuberculata curvata
З1	Shell not curved	32
32	Shell elongated-ovate	E. tuberculata
32’	Shell elongated-cylindrical	E. tuberculata subcylindrica
33	The shell has spines	34
33’	The shell does not have spines	42
34	The spines are located more or less evenly over the entire surface of the shell
SCALES
34	Spines of varying length are located on the apical part of the shell in the form of a bundle	E. bryophila
35	Apertural scales are almost triangular, form a clearly visible thickened row	36
35'	Apertural scales are of a different shape, do not form a thickened row	38
36	Length of the spines is the same	37
36'	Spines of varying length	E. strigosa heterospina
37	Shell ovoid	E. strigosa
37'	Shell broadly pear-shaped	E. strigosa muscorum
38	The entire surface of Shell covered with numerous spines	E. filifera spinosa
38’	The spines are few in number, located mainly in the back of the shell	39
39	Shell elongated-oval	40
39’	The shape of Shell different	41
40	The length of Shell less than 100 µm	E. filifera
40’	Shell length more than 100 µm	E. filifera magna
41	Shell pear-shaped	E. filifera pyriformis
41’	Shell cylindrical	E. filifera cylindracea
42	Apertural scales oval	43
42’	Apertural scales of a different shape	47
43	Shell oval, the sides are almost parallel	44
43’	Shell ovoid	45
44	Shell length not more than 20 µm	E. anodonta
44’	Shell more than 20 µm long	E. anodonta magna
45	Shell curved	E. rotunda obliqua
45’	Shell not curved	46
46	Shell is radially symmetrical, moderately flattened	E. rotunda
46’	Shell bilaterally symmetrical (the ventral side is flattened, the dorsal side is slightly curved)	E. rotunda dorsalis
47	Apertural scales almost triangular, forming a clearly visible thickened row	E. strigosa glabra
47’	Apertural scales lanceolate, consisting of two parts, on the side facing the Apertural cavity there is 1 large and 4 tiny spines	E. simplex
48	Shell with spines	49
48’	Shell without spines	51
49	Shell medium or relatively large (40-100 µm), ovoid with a somewhat elongated anterior end, the spines are short, often paired, located along the lateral border or along the entire length of the shell	50
49'	Shell 70-100 µm, pyriform, with short and thick spines, but never very numerous. Body scales very elongated, and very regular, as found in genus Assulina.	E. leclercqi
49’'	Shell larger, oval, lenticular in profile, strongly flattened, the spines are short, located along the lateral border	E. compressa
50	The length of the spines is the same	E. ciliata
50’	The spines are of different lengths	E. ciliata heterospina
51	In profile along the edge of the shell there is a clearly visible row of evenly spaced body scales of the same size	E. marginata
51’	The marginal row of body scales is absent	52
52	Apertural scales not always equally pointed, often irregular in shape, entire	53
52’	Apertural scales are identical, of regular shape	54
53	Shell small (23-49 µm), ovoid in plan	E. denticulata
53’	Shell larger (up to 70 µm), curved in shape with a flattened fundus	E. van oyei
54	Apertural scales are smooth, without teeth or projections	E. laevis
54'	Apertural scales with a single very clear, blunt denticle, flanked by two very refractile projections	E. polylepis
54’'	Apertural scales with teeth	55
55	Shell is 40-100 µm long, ovoid in plan with a slightly elongated anterior end	E. ciliata glabra
55’	Shell is 70-132 µm long, oval in plan, lenticular in profile, strongly flattened	E. compressa glabra

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