Compare

Brachysira ocalanesis is wider and more elongate.

Brachysira vitrea has a broader valve and finer striae and longer, pointed papillae (SEM).

Brachysira silvicola (from New Caledonia) has truncated apices, a broader hyaline region between the axial area ribs, and a lower stria density.

Brachysira hofmanniae (from Europe) has an undulating valve margin and truncate to capitate apices.

LM scalebar = 10 µm
Ansp 15991A 13 Na Brachysira microcephala LM5 Brachysira microcephala LM2 Brachysira microcephala LM1 Brachysira microcephala LM4 Brachysira microcephala LM3 Brachysira microcephala LM6
Length Range
17-30 µm
Width Range
3.5-7 µm
Striae in 10 µm
30-36

Brachysira ocalanensis

Shayler and Siver 2004

Brachysira ocalanensis LM1 Brachysira ocalanensis LM2 Brachysira ocalanensis LM3 Brachysira ocalanensis LM4 Brachysira ocalanensis LM5 Brachysira ocalanensis LM6 Brachysira ocalanensis LM7
Length Range
19.0-38.6 µm
Width Range
4.0-5.7 µm
Striae in 10 µm
32-34, more closely spaced towards the apices

Brachysira vitrea

(Grunow) R.Ross in B.Hartley 1986

Brachysira Vitrea 1 Brachysira Vitrea 2 Brachysira Vitrea 3 Brachysira Vitrea 4 Brachysira Vitrea 5 Brachysira Vitrea 6 Brachysira Vitrea 7
Length Range
12.4-25.4 µm
Width Range
4.3-5.9 µm
Striae in 10 µm
32-36

Also compare to

Brachysira silvicola

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

Brachysira hofmanniae

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