Megalognatha là một chi bọ cánh cứng trong họ Chrysomelidae.
Chi này được miêu tả khoa học năm 1878 bởi Baly.

Các loài 
Các loài trong chi này gồm:
 Megalognatha abyssiniaca Jacoby, 1886
 Megalognatha aenea Laboissiere, 1920
 Megalognatha alutaceipennis Laboissiere, 1937
 Megalognatha angolensis Laboissiere, 1939
 Megalognatha apicalis Weise, 1904
 Megalognatha apicicornis Laboissiere, 1926
 Megalognatha babaulti Laboissiere, 1920
 Megalognatha bayeri Laboissiere, 1926
 Megalognatha bequaerti Laboissiere, 1926
 Megalognatha berneri Laboissiere, 1939
 Megalognatha bicolora Laboissiere, 1926
 Megalognatha bicostata Allard, 1889
 Megalognatha bisulcata Laboissiere, 1927
 Megalognatha bryanti Laboissiere, 1927
 Megalognatha burgeoni Laboissiere, 1940
 Megalognatha camerounensis Laboissiere, 1927
 Megalognatha carinata Laboissiere, 1921
 Megalognatha castaneipennis Laboissiere, 1927
 Megalognatha cavicollis Baly, 1878
 Megalognatha chevalieri Laboissiere, 1921
 Megalognatha cruciata Jacoby, 1883
 Megalognatha cyanipennis Weise, 1902
 Megalognatha deformicornis (Quedenfeldt, 1888)
 Megalognatha diluta Laboissiere, 1927
 Megalognatha elegans Baly, 1878
 Megalognatha ephippiata Laboissiere, 1927
 Megalognatha ertli Weise, 1907
 Megalognatha exosomoides Laboissiere, 1927
 Megalognatha fasciata Laboissiere, 1927
 Megalognatha femoralis Laboissiere, 1940
 Megalognatha festvai (Fabricius, 1781)
 Megalognatha fulvilabris Laboissiere, 1926
 Megalognatha granulicollis Jacoby, 1903
 Megalognatha grisea Weise, 1903
 Megalognatha grouvellei Weise, 1912
 Megalognatha guttata Laboissiere, 1927
 Megalognatha hamaticornis Laboissiere, 1927
 Megalognatha hirticollis Jacoby, 1903
 Megalognatha imbecilla Weise, 1902
 Megalognatha inconspicua Jacoby, 1906
 Megalognatha kapiriensis Laboissiere, 1926
 Megalognatha longicollis Laboissiere, 1927
 Megalognatha lundana Laboissiere, 1939
 Megalognatha maculicollis Laboissiere, 1927
 Megalognatha majorina Laboissiere, 1927
 Megalognatha marginata Laboissiere, 1927
 Megalognatha maynei Laboissiere, 1927
 Megalognatha melanaria Laboissiere, 1926
 Megalognatha melanocephala Jacoby, 1903
 Megalognatha meruensis Weise, 1909
 Megalognatha metallica Jacoby, 1886
 Megalognatha monardi Laboissiere, 1939
 Megalognatha montana Laboissiere, 1939
 Megalognatha mystaxa Grobbelaar, 1993
 Megalognatha natalensis Jacoby, 1903
 Megalognatha neavei Laboissiere, 1926
 Megalognatha nigroaenea Laboissiere, 1926
 Megalognatha nigrocastanea Laboissiere, 1931
 Megalognatha nigrofasciata Jacoby, 1903
 Megalognatha nodicornis Laboissiere, 1927
 Megalognatha nyassensis Laboissiere, 1926
 Megalognatha pilicollis Laboissiere, 1940
 Megalognatha pilosa Laboissiere, 1926
 Megalognatha pimenteli Laboissiere, 1939
 Megalognatha procera Quedenfeldt, 1888
 Megalognatha pubescens Laboissiere, 1926
 Megalognatha pygidialis Laboissiere, 1926
 Megalognatha reflecta Laboissiere, 1926
 Megalognatha rohani Laboissiere, 1921
 Megalognatha rolleti Laboissiere, 1926
 Megalognatha ruandana Weise, 1913
 Megalognatha ruficollis Allard, 1889
 Megalognatha rufiventris Baly, 1878
 Megalognatha rugipennis Laboissiere, 1927
 Megalognatha scopsorum Laboissiere, 1940
 Megalognatha scopularipes Laboissiere, 1927
 Megalognatha semicincta Laboissiere, 1940
 Megalognatha sheppardi Jacoby, 1906
 Megalognatha similis Laboissiere, 1926
 Megalognatha simplex Weise, 1904
 Megalognatha spillmanni Laboissiere, 1939
 Megalognatha subcylindrica Baly, 1878
 Megalognatha sudanica Laboissiere, 1926
 Megalognatha suturalis Baly, 1878
 Megalognatha tinantae Laboissiere, 1926
 Megalognatha torquata Laboissiere, 1927
 Megalognatha triplagiata Laboissiere, 1927
 Megalognatha unifasciata Jacoby, 1883
 Megalognatha usambarica Weise, 1904
 Megalognatha variicornis Weise, 1902
 Megalognatha ventricosa Baly, 1878
 Megalognatha versicolora Laboissiere, 1926
 Megalognatha verticalis Laboissiere, 1939
 Megalognatha vicina Laboissiere, 1926
 Megalognatha viridipennis Weise, 1907
 Megalognatha weisei Jacoby, 1906

Chú thích