Planaxis sulcatus occurs in large populations; over a broad biogeographically range throughout the Indo-Pacific Region (Houbrick 1987). In the Southern Hemisphere, they are found to occur from the east, along the tropical coasts of Australia, in Queensland, Western Australia and the Northern Territories, New Caledonia, Fiji, Papua New Guinea, island groups of Aldabra, Mauritius and the Maldives in the Indian Ocean and to the west, along the eastern continental coast of Africa in Mozambique, Kenya and the Mascarene Basin. In the Northern Hemisphere, they are common along the coasts of Southeast Asian countries such as in Indonesia, Singapore, Malaysia, Thailand and the Philippines, further north in Hong Kong and Southern Japan, to the west along the coast of India, Pakistan, the Persian Gulf, Tanzania and the Red Sea (EOL 2011; Lau 2004; McKillup & McKillup 1993; Rosenberg 2010; Stirling 1982; Taylor 1978).
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