Encyonopsis microcephala sensu Krammer has wider valves and a lower stria density. Encyonopsis minuta has a lower stria density and has more lanceolate (less linear) valves. Encyonopsis subminuta has wider valves, subcapitate apices, and a somewhat lower stria density.

LM scalebar = 10 µm
Encyonopsis Alpina 1 Encyonopsis Alpina 2 Encyonopsis Alpina 3 Encyonopsis Alpina 4 Encyonopsis Alpina 5 Encyonopsis Alpina 6 Encyonopsis Alpina 7
Length Range
12.9-14.4 µm
Width Range
2.9-3.6 µm
Striae in 10 µm

Encyonopsis minuta

Krammer and E.Reichardt in Krammer 1997

Encyonopsisminuta1 Encyonopsisminuta2 Encyonopsisminuta7 Encyonopsisminuta5 Encyonopsisminuta3 Encyonopsisminuta4 Encyonopsisminuta6
Length Range
11.0-14.1 µm
Width Range
3.1-3.7 µm
Striae in 10 µm

Encyonopsis subminuta

Krammer and E.Reichardt 1997

Encyonemopsis Subminuta 002 Encyonemopsis Subminuta 001 Encyonemopsis Subminuta 003 Encyonemopsis Subminuta 006 Encyonemopsis Subminuta 004
Length Range
10-15 µm
Width Range
3-4 µm
Striae in 10 µm

Also compare to

Encyonopsis microcephala sensu Krammer

(Grunow) Krammer