Compare

Valves of B. wygaschii are more rhombic in valve outline than B. neoactuta, with a large central area and a lower stria density (20-24 in 10 µm). Valves of B. metzeltinii are more narrow and shorter in length (26-37 µm) and have a higher stria density (27-30 in 10 µm). Brachysira liliana valves have a higher density of stria and areolae, along with a longitudinally expanded central area.

LM scalebar = 10 µm
Bracysira neoacuta LM7 Bracysira neoacuta LM6 Bracysira neoacuta LM5 Bracysira neoacuta LM4 Bracysira neoacuta LM3 Bracysira neoacuta LM2 Bracysira neoacuta LM1
Length Range
31-51 µm
Width Range
6.5-9 µm
Striae in 10 µm
24-26

Also compare to

Brachysira liliana

Lange-Bert. in Lange-Bert. and Gerd Moser

Brachysira metzeltinii

Lange-Bert. in Lange-Bert. and Gerd Moser

Brachysira wygaschii

Lange-Bert. in Lange-Bert. and Gerd Moser