The invasive species Tricellaria inopinata probably originates from the North Pacific Ocean. It was first described from the lagoon of Venice, in 1985. Since then it has spread over much of the north-east Atlantic Ocean.
- De Blauwe, H.; Faasse, M. (2001). Extension of the range of the Bryozoans Tricellaria inopinata and Bugula simplex in the north-east Atlantic ocean (Bryozoa: Cheilostomatida). Ned. Faunist. Meded. 14: 103-112