Compare Gogorevia exilis
Compare
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
Length Range
5-17 µm
5-17 µm
Width Range
4.5-6.2 µm
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
24-34 in center of raphe valve, 20-25 in center of rapheless valve, up to 45 at apices