Othelosoma flavescens generally reaches up to 55 mm long,[2] but when creeping, can reach 80 mm.[3] The dorsal side is a yellow color, and the ventral side is slightly paler. A brown midline on the dorsal side runs from the back end to around 6–8 mm from the front. The creeping sole is a whitish color.[3][2]
^ abH. D. Jones (2004) A new species of land planarian (Platyhelminthes: Tricladida: Terricola: Rhynchodemidae) from South Africa, with a list of African terrestrial planarian species. African Zoology, 39:1, 31-40, doi:10.1080/15627020.2004.11407283.
^ abJameson, H. L. (1907). Some Natal Land Planarians. Add. pap. Brit. and South Afr. Ass. Rep., Vol III, pp. 27-39, t. 1-3, London, 1907.