Alvania dijkstrai
Alvania dijkstrai is a species of minute sea snail in the family Rissoidae endemic to the Savage Islands of Portugal. Description. It has an ovate shell, in height and in length with a thin outer lip. Sometimes two rows of very vague, light brown dots are visible on the ultimate whorl, one just subsutural and one on the shell base. Distribution. It is endemic to the Selvagens Archipelago off Northwest Africa.