Navicula trilatera may be distinguished from N. longicephala, N. tenelloides, N. veneta, and N. vilaplanii by the size and shape of its valves, apices, and central area. The central area of N. trilatera is the largest of all of these small Navicula species.

LM scalebar = 10 µm
Navicula trilatera LM8 Navicula trilatera LM3 Navicula trilatera LM2 Navicula trilatera LM6 Navicula trilatera LM5 Navicula trilatera LM4 Navicula trilatera LM1
Length Range
17.6-26.3 µm
Width Range
4.5-5.5 µm
Striae in 10 µm

Navicula longicephala

Hust. 1944

Navicula longicephala LM2 Navicula longicephala LM3 Navicula longicephala LM6 Navicula longicephala LM7 Navicula longicephala LM5 Navicula longicephala LM4 Navicula longicephala LM1
Length Range
17-22 µm
Width Range
3.1-4.0 µm
Striae in 10 µm

Navicula vilaplanii

(Lange-Bert. and Sabater) Lange-Bert. and Sabater in Rumrich et al. 2000

Navicula vilaplanii LM6 Navicula vilaplanii LM5 Navicula vilaplanii LM1 Navicula vilaplanii LM4 Navicula vilaplanii LM7 Navicula vilaplanii LM2 Navicula vilaplanii LM3
Length Range
12-15.5 µm
Width Range
2.5-3.3 µm
Striae in 10 µm

Navicula veneta

Kütz. 1844

Gc112144  Nrsa0167  Naven4 Gc112144  Nrsa0167  Naven7 Gc112144  Nrsa0167  Naven1 Gc112144  Nrsa0167  Naven5 Gc112144  Nrsa0167  Naven6 Gc112144  Nrsa0167  Naven3 Gc112144  Nrsa0167  Naven2
Length Range
17-26 µm
Width Range
4.4-5.3 µm
Striae in 10 µm
14-15 in the center valve

Also compare to

Navicula tenelloides

Hust. 1937