Delicata alpestris, D. delicatula and D. canadensis are narrower and have protracted apices. Delicata verena, described from a well in Egypt, is more elliptic in shape, larger in size, and lacks shorter median striae on the dorsal side.

LM scalebar = 10 µm
Delicata Montana 1 290102 Delicata Montana 2 290102 Delicata Montana 3 290102 Delicata Montana 4 290102 Delicata Montana 5 290102 Delicata Montana 6 290102 Delicata Montana 7 290102
Length Range
23-46 µm
Width Range
5.1-7.6 µm
Striae in 10 µm
16-18 center (dorsal) up to 24 at the apices; 18-25 ventral side

Delicata delicatula

(Kütz.) Krammer 2003

Delicata delicatula LM1 Delicata delicatula LM3 Delicata delicatula LMs Delicata delicatula LM4 Delicata delicatula LM5 Delicata delicatula LM6
Length Range
20-49.5 µm
Width Range
4.7-7.4 µm
Striae in 10 µm
17-24 dorsal, 19-27 ventral

Delicata alpestris

(Krammer) Bahls 2017

Delicata Alpestris LM1 Delicata Alpestris LM2 Delicata Alpestris LM3 Delicata Alpestris LM4 Delicata Alpestris LM5 Delicata Alpestris LM6 Delicata Alpestris LM7
Length Range
17-51 µm
Width Range
4.6-7.5 µm
Striae in 10 µm
18-28 dorsal, 19-28 ventral

Delicata canadensis

L.L. Bahls 2017

Delicata canadensis LM1 Delicata canadensis LM2 Delicata canadensis LM4 Delicata canadensis LM3 Delicata canadensis LM5 Delicata canadensis LM6
Length Range
23-36 µm
Width Range
4.1-5.4 µm
Striae in 10 µm
18-22 dorsal, 20-25 ventral

Also compare to

Delicata verena

Lange-Bert. and Krammer in Krammer