Micrarionta opuntia, known as the prickly pear island snail, pricklypear islandsnail, or prickly pear snail, is a species of land snail in the family Xanthonychidae.

[1][2][3] It is endemic to California, first formally described in 1975.

[4] The type locality is northeastern San Nicolas Island, at the base of a prickly pear (Opuntia littoralis), in a small depression.

[4] It reaches around 10.5 mm (13⁄32 in) in diameter.

[4]