Compare Eunotia papilioforma
The position of the helictoglossa in E. papilioforma may be more removed (central) from the apex, as in E. incisa. Valves of E. incisa, however, are symmetrical in regard to apex width and position of the helictoglossae. The type illustrations of E. rhomboidea are more or less asymmetrical about the transapical axis (Simonsen 1987, Plate 546), but in comparison to E. rhomboidea, E. papilioforma valves are consistently wider.
LM scalebar = 10 µm
Length Range
13-35 µm
13-35 µm
Width Range
3.3-4.8 µm
3.3-4.8 µm
Striae in 10 µm
13-16
13-16
Length Range
12-50 µm
12-50 µm
Width Range
2.8-5.0 µm
2.8-5.0 µm
Striae in 10 µm
16-21 in the center valve
16-21 in the center valve
Length Range
18.0-25.6 µm
18.0-25.6 µm
Width Range
2.7-3.8 µm
2.7-3.8 µm
Striae in 10 µm
15-17 in the center valve
15-17 in the center valve
