Cerithidea obtusa is a species of sea snail, a marine gastropod mollusk in the family Potamididae. The Obtuse Horn Shell, also known as Mud Creeper, is a relatively common snail found in muddy coastal areas. It grows to around 5–6 cm. It is used as a food in Southeast Asia, where it is known by the name of Belitung and Siput Sedut in Malay, Hoi Joob Jaeng (Thai: หอยจุ๊บแจง), and Ốc Len in Vietnamese.

Many South East Asians eat the mud creeper as a dish, particularly in Malaysia, southern Thailand, certain parts of Indonesia, and Vietnam.