Harpago arthriticus, common name : the arthritic spider conch, is a species of sea snail, a marine gastropod mollusk in the family Strombidae, the true conchs.
The size of an adult shell varies between 110mm and 190mm.
This species is distributed in the Indian Ocean along the Aldabra Atoll, Kenya, Madagascar, the Maldives, the Mascarene Basin, Mauritius, Mozambique, Réunion, the Seychelles and Tanzania; in the Pacific Ocean along the Philippines.