Compare Surirella striatula
Compare
Surirella cruciata has cuneate apices and does not twist about the apical axis. Surirella iowensis has porcae that are restricted to the margins. Surirella ovalis has smaller valves and distinct longitudinal markings running the length of the valve. Petrodictyon gemma has distinct costae rather than undulating ribs.
LM scalebar = 10 µm
Length Range
70.7-126.5 µm
70.7-126.5 µm
Width Range
46.4-80.7 µm
46.4-80.7 µm
Striae in 10 µm
16-22
16-22
Surirella cruciata
Length Range
48–160 µm
48–160 µm
Width Range
24–61 µm
24–61 µm
Striae in 10 µm
19–29 in the center valve, 22–30 at the ends
19–29 in the center valve, 22–30 at the ends
