Lepas (Anatifa) australis Darwin 1851

are eaten by

• Global Biotic Interactions: Pachyptila crassirostris (Mathews 1912) (Fulmar Prion)
• Global Biotic Interactions: Eudyptes chrysocome (Forster & JR 1781) (Rockhopper Penguin)
• Global Biotic Interactions: Halobaena caerulea (Gmelin & JF 1789) (Blue Petrel)
• Global Biotic Interactions: Garrodia nereis (Gould 1841) (Gray-backed Storm-Petrel)
• Global Biotic Interactions: Pachyptila desolata (Gmelin & JF 1789) (Antarctic Prion)

are preyed upon by

• Global Biotic Interactions: Pachyptila belcheri (Mathews 1912) (Narrow-billed prion)
• Global Biotic Interactions: Pachyptila vittata (Forster & G 1777) (Broad-billed Prion)
• Global Biotic Interactions: Thalassarche chrysostoma (Forster & JR 1785) (Grey-headed Albatross)
• Global Biotic Interactions: Oceanites oceanicus (Kuhl 1820) (Wilson's Storm Petrel)
• Global Biotic Interactions: Pelecanoides georgicus Murphy & Harper 1916 (South Georgia Diving Petrel)

parasitize

• Global Biotic Interactions: Arctocephalus tropicalis (J. E. Gray 1872) (Amsterdam Island Fur Seal)