Compare Navicula genovefae
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Prestauroneis protractoides is difficult to distinguish, see discussion in the Observations section. Prestauroneis integra valves have tri-undulate margins, greater length and greater breadth. Prestauroneis protracta valves have greater length and breadth, with more dense striae at mid-valve.
LM scalebar = 10 µm
Length Range
18.8-25.1 µm
18.8-25.1 µm
Width Range
5.5-5.9 µm
5.5-5.9 µm
Striae in 10 µm
14-16 at midvalve; 19-21 toward the apices
14-16 at midvalve; 19-21 toward the apices
Prestauroneis integra
Length Range
26.6-43.0 µm
26.6-43.0 µm
Width Range
9.3-12.6 µm
9.3-12.6 µm
Striae in 10 µm
9.9-15 at center of the valve, 15.7-20.8 near the apices
9.9-15 at center of the valve, 15.7-20.8 near the apices