Compare Rossithidium anastasiae
Rossithidium pusillum has smaller valves, lower stria density, and more narrow axial area on the raphe valve.
Rossithidium petersenii has much larger central area on the raphe valve and a wider, rhomboid axial area on the rapheless valve.
Achnanthidium crassum has valves that are slightly arched. Striae on the raphe valve are radiate with greater stria density at the ends.
LM scalebar = 10 µm
Length Range
12-26 µm
12-26 µm
Width Range
3.7-4.5 µm
3.7-4.5 µm
Striae in 10 µm
24-29
24-29
Length Range
13-18.5 µm
13-18.5 µm
Width Range
3.5-4.5 µm
3.5-4.5 µm
Striae in 10 µm
32-36
32-36
Length Range
10–16 µm
10–16 µm
Width Range
3.1-4.1 µm
3.1-4.1 µm
Striae in 10 µm
20-24
20-24
Length Range
7.3-19.6 µm
7.3-19.6 µm
Width Range
3.1-4.5 µm
3.1-4.5 µm
Striae in 10 µm
17-24
17-24
