Cylindroporella tubulosa is an encrusting bryozoan that forms small round patches. Autozooids are oval and convex. They are 0.35-0.4 by approximately 0.2 mm.
Cylindroporella tubulosa is an arctic-boreal species, with a circumpolar distribution. It occurs only rarely in British waters from Shetland and off the north-east coast of Britain.
The species is able to colonise shells, stones and algae. It has been recorded from between 5 and 230 metres.