Bactrocythara haullevilleiBactrocythara haullevillei is a species of sea snail, a marine gastropod mollusk in the family Mangeliidae.Subspecies: ''Bactrocythara haullevillei albida''DescriptionThe length of the shell attains 5 mm.DistributionThis marine species occurs off Guinea, West Africa, and off the estuary of the Congo River.