Austromegabalanus is a genus of giant barnacles. It contains both extant and extinct species.

Species There are nine extant and fossil species: †Austromegabalanus carrioli Collareta et al., 2019 Austromegabalanus cylindricus (Gmelin, 1780)Branch, G.M., Branch, M.L, Griffiths, C.L. and Beckley, L.E. 2005. Two Oceans: a guide to the marine life of southern Africa Austromegabalanus isolde (Holthius & Silvertsen, 1967) Austromegabalanus kensleyi Pether, 1990 Austromegabalanus nigrescens (Lamarck, 1818) †Austromegabalanus piscoensis Carriol et al., 1987 Austromegabalanus psittacus (Molina, 1788) †Austromegabalanus victoriensis Buckeridge, 1983 Austromegabalanus zulloi Newman, 1979

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