Alvania annobonensis is a species of minute sea snail, a marine gastropod mollusk or micromollusk in the family Rissoidae. Distribution The species has been found at 8 m depth off the islet Tortuga, near the island of Annobón, Equatorial Guinea. References Rissoidae Gastropods described in 2004 Invertebrates of Equatorial Guinea Fauna of Annobón