Casmena is a genus of leaf beetles in the subfamily Eumolpinae. It is distributed in Africa.

Species Casmena bicoloripes Pic, 1941 – Cameroon Casmena calva Burgeon, 1941 – DR Congo Casmena camerunensis Pic, 1953 – Cameroon Casmena congoensis Selman, 1972 – Congo, DR Congo, Ivory Coast Casmena elongata Pic, 1953 – Guinea Casmena ghesquierei Burgeon, 1941 – DR Congo Casmena gracilis Burgeon, 1941 – DR Congo Casmena humeralis Pic, 1923 – Ethiopia Casmena incerta Pic, 1951 – Senegal Casmena minuta Pic, 1952 – DR Congo Casmena murrayi Chapuis, 1874 – West Africa, DR Congo Casmena nigricolor Pic, 1951 – DR Congo Casmena schoutedeni Pic, 1952 – DR Congo Casmena sericea Burgeon, 1941 – DR Congo Casmena subacuminata Pic, 1941 – Congo, DR Congo Casmena unicolor Pic, 1923 – Tanzania

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