About Clavelina australis (Herdman, 1899)
Clavelina australis is a sessile, colonial filter-feeder, similar to most other ascidians. Its colonies consist of a large number of individual zooids that grow out from a solid, stalk-like test. Full colonies have an average width of 9 centimetres (3.5 in), while individual zooids are much smaller, measuring roughly 2 centimetres (0.79 in) in length and 5 millimetres (0.20 in) in width. This species is recorded from the waters of southeastern Australia. Its colonies anchor to rocks and coral reefs in shallow water, at depths up to 20 metres (66 ft).
