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The list of marine heterobranch gastropods of South Africa is a list of saltwater mollusc species that form a part of the molluscan fauna of South Africa. This list does not include the land or freshwater molluscs.

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This list of marine gastropods of South Africa attempts to list all of the sea snails and sea slugs of South Africa, in other words the marine gastropod molluscs of that area. This list is a sub-list of the List of marine molluscs of South Africa.

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The list of marine molluscs of South Africa is a list of saltwater species that form a part of the molluscan fauna of South Africa. This list does not include the land or freshwater molluscs.

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The list of non-marine molluscs of South Africa is a list of freshwater and land species that form a part of the molluscan fauna of South Africa.

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Cabestana cutacea, common name the Mediterranean bark triton, is a species of predatory sea snail, a marine gastropod mollusk in the family Cymatiidae.

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Carybdea branchi, the South African box jellyfish, is a venomous species of cnidarian, in the small family Carybdeidae within the class Cubozoa.

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Charonia lampas is a species of predatory sea snail, a marine gastropod mollusk in the family Charoniidae.

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Clathrina coriacea is a species of calcareous sponge belonging to the family Clathrinidae.

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Scutellastra longicosta, the long-spined limpet or the duck's foot limpet, is a species of true limpet, a marine gastropod mollusk in the family Patellidae, one of the families of true limpets. It is native to the coasts of South Africa where it is found on the foreshore. It cultivates a species of crustose brown algae in a "garden".

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The tubular sponge hydroid is a species of hydroid cnidarian. It is a member of the family Tubulariidae. These animals usually grow embedded in sponges.