Arcuate

Arcuate refers to a diatom valve margin that is curved like a bow or is bent along the apical axis. For example, species in the genus Hannaea have valves with an arcuate margin.

Citations

Barber, H.G. and Haworth, E.Y. (1981) Guide to the Morphology of the Diatom Frustule Freshwater Biological Association, 112 pp.

Hannaea 007 — Valves of *Hannaea arcus* have an arcuate valve margin.