Gelagna succincta, common name the lesser girdled triton, is a species of predatory sea snail, a marine gastropod mollusk in the family Cymatiidae.
This species is distributed in the Indian Ocean (Tanzania, Madagascar), in the Atlantic Ocean (Gabon, West Africa, Cape Verde) and the Red Sea. Also reported from Brazil and from South-East Florida. Beached shells are rarely known from the East coast of Barbados, Lesser Antilles.
The shell size varies between 30 mm and 80 mm.
The maximum recorded shell length is 45 mm.
The minimum recorded depth for this species is 20 m; maximum recorded depth is 20 m.