Obovate, with a concavity in each side, like the body of a violin; fiddle-shaped.
Shaped like the body of a fiddle or the number eight (8).
References
Barber, H.G. & Haworth, E.Y. 1981. A guide to the morphology of the diatom frustule. Freshwater Biological Association, Ambleside, Cumbria, UK. 112 pp.
