Compare

Neidium undulatum and N. kozlowii have wider valves, protracted apices and a lower stria density (10-12 in 10 µm). Valves of N. kozlowii var. ellipticum are elliptic in shape. Both N. kozlowii and N. kozlowii var. ellipticum have straight proximal raphe ends.

LM scalebar = 10 µm
Neidium bobmarshallensis LM1 Neidium bobmarshallensis LM2 Neidium bobmarshallensis LM3 Neidium bobmarshallensis LM4 Neidium bobmarshallensis LM5
Length Range
60-79 µm
Width Range
14.8-17.8 µm
Striae in 10 µm
13-15

Neidium undulatum

L.L.Bahls 2013

Neidium undulatum LM5 Neidium undulatum LM1 Neidium undulatum LM2 Neidium undulatum LM3 Neidium undulatum LM4
Length Range
82-110 µm
Width Range
23-26 µm
Striae in 10 µm
10-12

Also compare to

Neidium kozlowii

Mereschk. 1906

Neidium kozlowii var. ellipticum

Mereschk. 1906