Ergalatax contracta, the contracted rock shell, is a species of sea snail, a marine gastropod mollusk in the family Muricidae, the murex snails or rock snails.

[1] The shell size varies between 20 mm and 45 mm.

This species is distributed in the Red Sea, the Persian Gulf, in the Indian Ocean along Madagascar and as a invasive species in the Mediterranean Sea, in the Pacific Ocean along the Philippines, the Sulu Archipelago, Australia (the Torres Strait), Hawaii and Tonga.

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