Compare

Frustulia creuzburgensis lacks longitudinal ribs, while F. neomundana demonstrates such ribs that extend across a portion of the valve face. In addition, F. creuzburgensis has slightly rostrate ends while F. neomundana has capitate or subcapitate ends.

LM scalebar = 10 µm
Frustulia creuzburgensis LM7 Frustulia creuzburgensis LM4 Frustulia creuzburgensis LM1 Frustulia creuzburgensis LM3 Frustulia creuzburgensis LM6 Frustulia creuzburgensis LM5 Frustulia creuzburgensis LM2
Length Range
26.0-38.0 µm
Width Range
6.0-8.0 µm
Striae in 10 µm
24-26 at the center, 28-30 at the ends

Also compare to

Frustulia neomundana

Lange-Bert. and Rumrich