Tectulum

A tectulum is a round or squarish occlusion attached to the edges of an areola by several small, regularly arranged struts. Best known from Placoneis, in the Cymbellales. From Latin for little roof. Plural is tectula.

Citations

Cox, E.J. (2004) Pore occlusions in raphid diatoms - a reassessment of their structure and terminology, with particular reference to members of the Cymbellales. Diatom 20: 33-46.

Publication Link: 10.11464/diatom1985.20.0_33
Idei M., Sato S. and Mann D.G. (2020) The Amazing World of Diatoms. Sogensha Publishers, Osaka, Japan, pp. 176.