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Epithemia argus lacks protracted and reflexed ends, and the dorsal margin is less convex. Epithemia turgida has a higher costa density and the proximal raphe ends are closer to the ventral margin. Epithemia adnata also has proximal raphe ends that are closer to the ventral margin. Differentiating these species in girdle view is difficult in LM.

LM scalebar = 10 µm
Epithemia Alpestris  Ill2017 01 Epithemia Alpestris  L 5 71 02 Epithemia Alpestris  Ill2017 07 Epithemia Alpestris  Ill2017 03 Epithemia Alpestris  L 5 62 04 Epithemia Alpestris  L 5 71 05 Epithemia Alpestris  Ill2017 06
Length Range
39 – 77 µm
Width Range
10.5-13.5 µm
Striae in 10 µm
10-12.5

Epithemia argus

(Ehrenb.) Kütz. 1844

83 Microns 75Microns 66 Microns 50Microns 40Microns 36 Microns
Length Range
36.2-84.3 µm
Width Range
8.4-13.9 µm
Striae in 10 µm
10-11

Epithemia turgida

(Ehrenb.) Kütz. 1844

Eptur Iho41265 8Ed 1 Eptur Iho41265 2Ed 1 Eptur Iho41265 7Ed 1 Eptur Iho41265 4Ed 1 Eptur Iho41265 6Ed 1 Eptur Iho41265 10Ed 1
Length Range
45-166 µm
Width Range
13.5-17 µm
Striae in 10 µm
8-10

Epithemia adnata

(Kütz.) Bréb. 1838

Epad Iho44070 1Edited Epad Iho44070 6Edited Epad Iho44070 3Edited Epad Nrsa1180 6Edited Epad Iho44070 7Edited Epad Iho44070 4Edited
Length Range
32-70 µm
Width Range
7.5-9.7 µm
Striae in 10 µm
12-14