Fenestrella Fenestella is a genus of bryozoans or moss animals, forming fan–shaped colonies with a netted appearance.

[1] The skeleton of Fenestella colonies consists of stiff branches that are interconnected by narrower crossbars (or dissepiments).

[2] The internal structure of the branches is of decisive importance in the assignment of specimens to genera and species, which greatly hampers identification of intact fossils.

[3] The distance between apertures in Fenestella remains the same as colonies grow and individuals (or zooids) will have had equal size lophophores.

[4] In 1935 the name Fenestella M'Coy, 1844 was replaced by Fenestrellina, because it is a junior homonym of a bivalve, now considered synonymous with Anomia.