The striae of M. atomus are more dense and radiate. Encyonopsis thumensis by having broader striae and more elliptical valves, as well as by lacking the slight apical asymmetry of E. thumensis.

LM scalebar = 10 µm
Mayamaea cahabaensis LM1 Mayamaea cahabaensis LM2 Mayamaea cahabaensis LM3 Mayamaea cahabaensis LM4 Mayamaea cahabaensis LM5 Mayamaea cahabaensis LM6 Mayamaea cahabaensis LM7
Length Range
5.1-12.0 µm
Width Range
2.2-3.4 µm
Striae in 10 µm

Encyonopsis thumensis

Krammer 1997

Encyonopsis Thumensis 1 Encyonopsis Thumensis 2 Encyonopsis Thumensis 3 Encyonopsis Thumensis 4 Encyonopsis Thumensis 5 Encyonopsis Thumensis 6 Encyonopsis Thumensis 7
Length Range
8.9 – 16.0 µm
Width Range
2.8-3.2 µm
Striae in 10 µm

Also compare to

Mayamaea atomus

(Kütz.) Lange-Bert.

BioData Reference
Krammer and Lange-Bertalot 2/1 Pl 74 Fig 10