A new species of the genus Trichodorus is described from natural vegetation in the Western Cape Province, South Africa. Trichodorus inventus sp. nov. is characterised by a relatively short body, short onchiostyle with inner onchium in all adults; in male, by short spicule length and spicule shape (dorsally convex in anterior part, with indentation at mid-calamus and a straight, striated posterior part); in females, by the small rounded vaginal sclerotized pieces in lateral view, a pore-like vulva in ventral view and one pair of prevulvar and post-advulvar lateral body pores. A population of T. vandenbergae was found associated with fynbos; additional morphological and morphometric information is provided.