Velum

Valvocopula

 

Ventral

Silica flap or porous plate covering an areola.

In a loculate areola, may form the external or internal wall, depending on species, opposite the foramen. Plural form is vela.

Two types of vela are cribra and volae.


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.