Species in genus Megymenum have extended or greatly expanded pronotal margins (as in the type speciesM. dentatum) with a rounded scutellum: characteristic of the Dinidoridae. In most species the second valvifers are reduced, lightly sclerotised, and fused in the middle. Some species have reduced hemelytra and are flightless.[3]
Species
The following species are currently (as of July 2024[update]) accepted in the genus:[1]
^Guérin FÉ (1831) Insectes, pls.12, 14bis. In: L.I. Duperrey, Voyage autour du monde, exécuté par ordre du Roi, sur la corvette de sa Majesté, La Coquille, pendant les années 1822, 1823, 1824 et 1825.; Histoire naturelle. Zoologie, par M. Lesson ; Insectes, par F.-E. Guérin, planches 1-21 (1830-1831); text pp.57-302 (1838). Arthus Bertrand, Paris.