Oncis Plate, 1893 (invalid: junior homonym of Oncis Herrmannsen, 1847) Platevindex is a genus of air-breathing sea slugs, a shell-less marine pulmonate gastropod mollusks in the family Onchidiidae.

[1][2] Platevindex slugs live in intertidal habitats of the Indo-West Pacific.

Most Platevindex species are found in mangrove forests, but some species may be found in salt marshes or on coral rubble near mangrove trees.

[2] These slugs are characterized by their dorso-ventrally flattened body and a very narrow foot.

[citation needed] According to the World Register of Marine Species (WoRMS), the following species with valid names are included within the genus Platevindex :[3]