About Austromegabalanus nigrescens (Lamarck, 1818)
This species has the scientific name Austromegabalanus nigrescens (Lamarck, 1818), commonly called the giant black barnacle. It is the largest acorn barnacle species occurring along Australia's coastlines, and can grow up to 6 cm tall and 3 cm across. This barnacle is distributed in New Zealand and southern Australia.