Agaronia testacea, a species of sea snail with the common name Panama false olive, is a marine gastropod mollusk in the family Olividae, which are known collectively as "the olives".

[2] Agaronia testacea has a muscular foot that it uses for crawling along the ocean floor, as well as two sensory tentacles.

The snail's mouth is located in the center of its foot, and it feeds on algae and other small organisms that it scrapes off rocks and other surfaces using a specialized feeding structure called a radula.

This species is found in shallow waters along the western coast of North America, from Alaska to Baja California.

It lives in rocky intertidal habitats, where it can be found clinging to rocks and other hard surfaces.