The insular birddrop or San Clemente Island blunt-top snail, scientific name Vertigo clementina, is a species of small, air-breathing land snail, a terrestrial gastropod mollusk in the family Vertiginidae.

)[1][3] (Original description) The shell is very minute, narrowly perforate and cylindrical.

The body whorl occupies rather more than two-fifths of the length of the shell and is somewhat ascending to the aperture, with a slight, revolving impression on the middle of its last half, ending at the auricle.

The aperture is lateral, scarcely oblique, subovate with the palatal margin slightly flattened, the upper part of same somewhat sinuous.

The peristome is a little expanded with a slightly thickened outer lip just at the margin.