About Spirobranchus cariniferus (Gray, 1843)
Scientific name: Spirobranchus cariniferus (Gray, 1843). Description: Adult worms of this species can reach 40 mm in length and 3 mm in width. They build a hard, white tube that is triangular in cross-section, with a ridge running along its top. This ridge extends above the tube opening to form a sharp protective spine. The operculum is a flat, calcareous plate. The stalk of the operculum is flat with extended wings. The worm's body is yellow to orange towards its posterior end, and bright blue at its anterior end. Its radioles are bright to dark blue, marked with some white bands. Distribution: This species is found throughout New Zealand. In the cooler climate of the country's South Island, accumulated layers of its tubes can grow up to 30 cm thick.
