Xerarionta kellettii

Xerarionta kelletii, common name the Catalina cactus snail, is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Helminthoglyptidae.

Anatomy
Snails in this species create and use love darts during mating.

The scanning electron microscope images on the left show (above) the lateral view of the love dart, scale bar 500 μm (0.5 mm); and (below) a cross section of the dart, scale bar 50 μm.