This taxon is easily distinguished from other monoraphid diatoms by the linear-elliptic valves with narrowly capitate to subrostrate apices and by the presence of a fascia on the raphe valve. Achnanthidium exiguum var. constrictum has strongly constricted valve margins. Smaller specimens of are sometimes incorrectly identified as Achnanthes exigua var. elliptica, because of their elliptic-lanceolate shape.

LM scalebar = 10 µm
Gogorevia exilis LM6 Gogorevia exilis LM2 Gogorevia exilis LM4 Gogorevia exilis LM1 Gogorevia exilis LM3 Gogorevia exilis LM5 Gogorevia exilis LM5
Length Range
5-17 µm
Width Range
4.5-6.2 µm
Striae in 10 µm
24-34 in center of raphe valve, 20-25 in center of rapheless valve, up to 45 at apices

Also compare to

Achnanthidium exiguum var. constrictum

(Grunow) Andresen, Stoermer and Kreis

Achnanthes exigua var. elliptica