Cerodontha (Dizygomyza) Hendel

Lonsdale, Owen, 2021, Manual of North American Agromyzidae (Diptera, Schizophora), with revision of the fauna of the " Delmarva " states, ZooKeys 1051, pp. 1-481 : 1

Cerodontha (Dizygomyza) Hendel

Dizygomyza Hendel, 1920: 130. Type species: Agromyza morosa Meigen 1830, by original designation. Hendel 1931: 83.

Phytobia (Dizygomyza) . Frick 1952a: 383, 1959: 383.

Cerodontha (Dizygomyza) . Nowakowski 1962: 102, 1967: 638; Spencer 1969: 113; Spencer and Steyskal 1986b: 100.

Dizygomyza is a predominantly north temperate subgenus characterised most obviously by a large, broad semi-circular lunule extending laterally to the fronto-orbital plate, the bases of the antennae are clearly separated, and the male first flagellomere is usually considerably enlarged and clothed in long, dense whitish hairs. Species are also often predominantly greyish tomentose across the body, including the lunule, with variable yellow or yellowish markings. Differences in external and genitalic morphology between species can be very slight, making global or even Nearctic studies difficult, but the four Delmarva species can be readily identified.