Nitzschia reversa has apices that are curved in opposite directions while the apices of N. acicularis are straight.

LM scalebar = 10 µm
Length Range
35.0-75.0 µm
Width Range
2.5-4.5 µm
Nitzschia reversa LM1
Nitzschia reversa LM2
Nitzschia reversa LM4
Nitzschia reversa LM3
Nitzschia reversa LM1 Nitzschia reversa LM2 Nitzschia reversa LM4 Nitzschia reversa LM3

Nitzschia acicularis

(Kütz.) W.Sm. 1853

Length Range
30.0-100.0 µm
Width Range
3.0-4.0 µm
Nitzschia acicularis LM3 Nitzschia acicularis LM1 Nitzschia acicularis LM2 Nitzschia acicularis LM4 Nitzschia acicularis LM5