Geosesarma larsi is a species of small land-living highland crab found in western Sarawak, Borneo.

Adults have a carapace width of 12–15 mm and are of a purplish-red colour, which distinguishes them from other Geosesarma species in Borneo.

The species is threatened by the loss of their small habitat.

[1][2] Geosesarma larsi is named after the German photographer and naturalist Lars Fehlandt, who discovered this species during an expedition in December 2016.

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