( foveolae, pl.): A pit; a deep depression with well-marked sides.

(pl. foveolae, adj. foveolate) ( Erdtman, 1952) A feature of ornamentation consisting of more or less rounded depressions or lumina more than 1µm in diameter. The distance between foveolae is greater than their breadth. See also: lumen, punctum. Frustillum (pl. frustilla, adj. frustillate) ( Fægri and Iversen, 1964) Synonym of areola.

the center of the fovea,0.5mm in diameter.