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Brachysira brebissonii is distinguished from small forms of B. hannae by a lower stria density and less radiate striae near the central area. Brachysira brebissonii has larger areolae, a lower stria density and a smaller central area compared to smaller valves of B. styriaca. Brachysira brebissonii has a more distinct lanceolate valve and larger areolae compared to smaller valves of B. zellensis. Brachysira brebissonii is most similar to B. lehmanniae, a species described from South America. Brachysira brebissonii is distinguished by large areolae that extend along the axial area and less radiate striae near the central area.

LM scalebar = 10 µm
Brachysira brebissonii LM7 Brachysira brebissonii LM6 Brachysira brebissonii LM5 Brachysira brebissonii LM4 Brachysira brebissonii LM3 Brachysira brebissonii LM2 Brachysira brebissonii LM1
Length Range
11-36 µm
Width Range
4-8 µm
Striae in 10 µm
26-35

Brachysira hannae

(Reimer) Lange-Bert. and Moser 1994

Brachysira hannae LM1 Brachysira hannae LM2 Brachysira hannae LM Brachysira hannae LM5 Brachysira hannae LM4
Length Range
30-60 µm
Width Range
14-19 µm
Striae in 10 µm
20-22

Brachysira styriaca

(Grunow) R.Ross in B.Hartley 1986

Brachysira styriaca LM1 Brachysira styriaca LM2 Brachysira styriaca LM3 Brachysira styriaca LM4 Brachysira styriaca LM5 Brachysira styriaca LM6 Brachysira styriaca LM7
Length Range
15.5-36.6 µm
Width Range
4.9-7.1 µm
Striae in 10 µm
26-30

Brachysira zellensis

(Grunow) Round and D.G.Mann 1981

Brachysira Zellensis1 Brachysira Zellensis3 Brachysira Zellensis2 Brachysira Zellensis4 Brachysira Zellensis5 Brachysira Zellensis6
Length Range
17.0-24.6 µm
Width Range
4.0-5.2 µm
Striae in 10 µm
30-32

Also compare to

Brachysira lehmanniae

Lange-Bert. and Gerd Moser