Also known as Coral Barnacle, Coral-dwelling Barnacle.
Found over shallow inter-tidal waters on the surface of corals and sponges of coral and rocky reefs also on piers, in seaweed, hulls of ships, on turtles and even crocodiles etc.
They feed on plankton.
Length - 10cm
Depth - 0-?m
Barnacles form part of the fouling community!
These barnacles attach to anything, even found on a Snappy Handbag (Crocodile) the size of the barnacle indicated how long the Snappy Handbag had been in salt water! Ref: https://en.wikipedia.org/wiki/Balanus