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Navicula capitatoradiata has very distinct protracted, rostrate ends while N. oligotraphenta has weakly protracted rounded ends. Navicula capitatoradiata also has more convergent striae near the poles.

LM scalebar = 10 µm
Navicula capitatoradiata LM2 Navicula capitatoradiata LM1 Navicula capitatoradiata LM5 Navicula capitatoradiata LM4 Navicula capitatoradiata LM3
Length Range
30-37 µm
Width Range
7.0-7.7 µm
Striae in 10 µm
14-15

Also compare to

Navicula oligotraphenta

Lange-Bert. and G.Hofm.