Reimeria sinuata has biseriate striae, while R. uniseriata has uniseriate striae and larger areolae (easily discernible in LM). The valves of R. sinuata are smaller and have a slightly different shape than those of R. uniseriata, R. sinuata f. antiqua, and R. lacus-idahoensis. R. sinuata f. antiqua has capitate ends; R. lacus-idahoensis is an extinct species with considerably larger valves (8-11 um wide).

LM scalebar = 10 µm
55002  Lm7 1 55002  Lm1 1 55002  Lm6 1 55002  Lm2 1 55002  Lm3 1 55002  Lm4 1 55002  Lm5 1
Length Range
8–22 µm
Width Range
3.1-5.5 µm
Striae in 10 µm

Also compare to

Reimeria uniseriata

Sala, Guerrero, and Ferrario

Reimeria sinuata f. antiqua

(Grunow) Kociolek and Stoermer

Reimeria lacus-idahoensis

Kociolek and Stoermer