Fenestrata is an extinct order of bryozoan, dating from the Upper Arenig.

[2] The colony shape served as a filter-feeding apparatus that water currents flowed through, with autozooecial apertures only on the side of the colony facing into the current.

[3] This colony structure was vulnerable to predators, so some fenestrate bryozoans produced skeletal superstructures, likely to strengthen or protect the colony, and others had protective spines surrounding their autozooecial apertures.

Some sources consider Fenestrata to be a synonym of Fenestrida,[4] while others treat them as separate orders.

You can help Wikipedia by expanding it.This prehistoric protostome article is a stub.