Apical axis

The apical axis is the long axis of the valve face of a pennate diatom, passing through the apices. It follows the midline of the valve and may be curved, as in the genus Cymbella.

See also pervalvar axis and transapical 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.

Apical Axis — *Navicula* is symmetrical to the apical axis. The black line runs along the apical axis.

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