Tricellaria ternata (Ellis and Solander, 1786)

 Tricellaria ternata is an erect bryozoan, forming delicate tufts, 2-3 cm in height, The colonies are composed of white, closely divided dichotomous branches which are jointed and usually bend in wards at the tip. The branches are straggling and/or climbing. Autozooids are elongated oblongs, tapering proximally. They are typically 0.75 or more in length. Generally there are three spines arranged on the distal margin of each autozooid.

The species is able to colonise seaweed, bryozoans, larger hydroids and shells. The species is predominantly found in shallow water, but has been reported up to 100 m.

Tricellaria ternata is found through Norway to the Arctic, in the Barents, Kara and Bering Seas. It is known from Shetland and Hamond (1973) reported it from the east coast of the British Isles as far south as Norfolk.