An integrative account of three new land flatworms from São Tomé Island, Gulf of Guinea, with the first molecular assessment of the phylogenetic position of the genus Othelosoma (Platyhelminthes, Geoplanidae)

Three new species of land flatworm of the genus Othelosoma are described from the island of São Tomé, Gulf of Guinea. Specimens were collected from ten localities during field surveys in 2016 and 2023 and examined using morphological, histological and molecular techniques. For the first time, molecular data (mitochondrial COI, nuclear 18S and 28S ribosomal markers) were obtained for the genus Othelosoma, allowing determination of its close relationship with another genus of Microplaninae, Microplana.