Species synonymy Morwennius is a monotypic moth genus in the family Sphingidae described by Alan Charles Cassidy, Michael G. Allen and Tony W. Harman in 2002.

[3] Its only species, Morwennius decoratus, the ornamented hawkmoth, was described by Frederic Moore in 1872.

[4] It is known from Nepal, Sikkim and Assam in north-eastern India, Yunnan in south-western China, northern Thailand, Laos, Peninsular Malaysia and Sumatra in Indonesia The wingspan is about 72 mm.

[5]