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Apical axis

Annulae

Apiculate

The long axis of a diatom is considered the apical axis.

Citations

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

Image Credit: Marina Potapova

Navicula is symmetrical to the apical axis. The black line runs along the apical axis.