Further reading:

Barber, H.G. & Haworth E.Y. (1981): A guide to the morphology of the diatom frustule. Freshwater Biol. Ass., Ambleside, U.K.  Scientific Publ. No. 44. 112 pp.

Round, F.E., Crawford, R.M. & Mann, D.G. (1990): The Diatoms. Biology & Morphology of the Genera. Cambridge University Press. 747pp.

Stace, C. A. (1989): Plant Taxonomy and Biosystematics. Cambridge University Press, Cambridge, U.K. 264 pp.

Werner, D. (1977 ed.): The Biology of Diatoms. Blackwell Scientific Publications, Oxford. 498 pp.