Spaulding, S.,
Edlund, M.
(2009).
Brevisira.
In Diatoms of North America.
Retrieved September 07, 2024, from https://diatoms.org/genera/brevisira
Centric
Brevisira
Valve face with central areolate area surrounded by radiating striae
Rimoportulae or fultoportulae absent
Valve margins with small, tapered spines
Brevisira is a centric diatom, with central areolae surrounded by radiating striae on the valve face. In contrast to many centric genera, Brevisira lacks both rimoportulae and fultoportulae. The frustules of Brevisira are small, with small tapered spines on the valve margins. Within a single frustule, one valve face may be concave, while...