Plagiodontes dentatus is a recent species of small to medium-sized air-breathing land snail, terrestrial pulmonate gastropods in the family Cyclodontinidae. It occurs in Entre Ríos Province, Argentina.

Fossil record: Plagiodontes dentatus has a fossil record extending back to the Brazilian Paleocene, with a supposed specimen belonging to this species found in the limestones of Itaboraí Basin. It has also been recorded from the Miocene of Uruguay and Miocene and Pleistocene of Argentina.