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

Reimeria uniseriata

Sala, Guerrero and Ferrario 1993

Gsn82684  Reuniser 4 Ed Gsn82684  Reuniser 6 Ed Gsn82684  Reuniser 7 Ed Gsn82684  Reuniser 2 Ed Gsn82684  Reuniser 5 Ed Gsn82684  Reuniser 3 Ed Gsn82684  Reuniser 1 Ed
Length Range
12.5-24 µm
Width Range
4.0-7.0 µm
Striae in 10 µm

Reimeria sinuata f. antiqua

(Grunow) Kociolek and Stoermer 1987

Reimeria sinuata f. antiqua LM5 Reimeria sinuata f. antiqua LM1 Reimeria sinuata f. antiqua LM2 Reimeria sinuata f. antiqua LM4 Reimeria sinuata f. antiqua LM3
Length Range
16-23 µm
Width Range
5.8-6.4 µm
Striae in 10 µm

Reimeria sapiens


Reimeria sapiens LM5 Reimeria sapiens LM2 Reimeria sapiens LM3 Reimeria sapiens LM6 Reimeria sapiens LM4 Reimeria sapiens LM7 Reimeria sapiens LM1
Length Range
10,000-30,000 µm
Width Range
6,000-8,000 µm
Striae in 10 µm
not resolvable in LM

Also compare to

Reimeria lacus-idahoensis

Kociolek and Stoermer