Pseudonebularia cucumerina, common name : the kettle mitre, is a species of sea snail, a marine gastropod mollusk in the family Mitridae, the miters or miter snails.
The shell size varies between 9 mm and 35 mm.
This species occurs in the Red Sea and in the Indian Ocean off Aldabra, Chagos, Madagascar, Mauritius, and the Mascarene Basin; in the Pacific Ocean off Fiji, the Solomons Islands, the Philippines, Okinawa, Australia, Papua New Guinea.