Othelosoma duplamaculosum is a species of land planarian from São Tomé Island.

Its dorsal side is black and covered by irregular yellow-ochre spots forming two lateral rows.

[1] The specific epithet duplamaculosum comes from Latin duplus, twofold, double + maculosus, spotted, and refers to the rows of spots on both the dorsal and ventral surfaces.

[1] Othelosoma duplamaculosum is distributed throughout the whole São Tomé Island.

The type locality is Monte Café, but it was also recorded in Pico de São Tomé and Ribeira Peixe.