The Lake Pedder planarian (Romankenkius pedderensis) is a species of invertebrate in the family Dugesiidae.

[3] This species was gregarious within the aquatic community of the lake before it flooded, living alongside small fish and invertebrates such as the Pedder galaxias and Lake Pedder earthworm.

[4] The species is endemic to the Lake Pedder area in Tasmania, Australia.

This species has been listed as extinct by the IUCN Red List of Threatened Species since 1986, although their last conservation assessment was dated 1996.

This flatworm- (or platyhelminth-) related article is a stub.