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.