Diastocera is a monotypic genus in the family Cerambycidae described by Pierre François Marie Auguste Dejean in 1835.

[1] Its only species, the African Diastocera trifasciata, was described by Johan Christian Fabricius in 1775,[2][3] but the Asian Thysia wallichii has on occasion been placed in the genus.

[4] Adult Diastocera trifasciata are 3.1–4.7 centimetres (1.2–1.9 in) in length, with males averaging larger than females and having clearly longer antennae.

This species can be found in Central Africa (Angola, Benin, Cameroon, Central African Republic, Democratic Republic of the Congo, Ethiopia, Ghana, Ivory Coast, Kenya, Liberia, Niger, Nigeria, Mozambique, Senegal, Sierra Leone and Togo).

[1] Diastocera trifasciata is typically an inhabitant of savannah, but it is also present in forests edges with plants of family Anacardiaceae.