Amauromyza Hendel, 1931

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

Amauromyza Hendel

Redia Lioy, 1864: 1313 [preoccupied by Filippi (1837)]. Type species: Agromyza gyrans Fallén, 1823, by subsequent designation [ Coquillett 1910: 599]. Frick 1952a [as synonym of Calycomyza ]. Spencer and Martinez 1987 [as synonym of Amauromyza ].

Amauromyza Hendel, 1931: 59 [as subgenus of Dizygomyza ]. Type species: Agromyza lamii Kaltenbach, 1858, by original designation. Frick 1952a: 393 [as subgenus of Phytobia ]; Nowakowski 1962: 97 [as genus]; Spencer 1969: 157; Spencer and Steyskal 1986b: 78; Zlobin 1996: 271; Boucher 2012b: 735.

Irenomyia Nowakowski, 1960: 421. Type species: Xeniomyza obscura Rohdendorf-Holmanova, 1959, by monotypy. Spencer 1966 [as synonym of Melanophytobia ]. Spencer and Martinez 1987 [as synonym of Amauromyza ].

Melanophytobia Hering, 1960: 127 [as subgenus of Phytobia ]. Type species: Phytobia chamaebalani Hering, 1960, by monotypy. Spencer and Martinez 1987).

Campanulomyza Nowakowski, 1962: 97. Type species: Agromyza gyrans Fallén, 1823, by monotypy. Spencer 1976 [synonymy].

Trilobomyza Hendel, 1931: 71 [as subgenus of Dizygomyza ]. Type species: Agromyza flavifrons Meigen, 1830, by original designation. Spencer 1969: 161 [as genus]. Spencer and Steyskal 1986b [as synonym of Cephyalomyza ]. Spencer 1987: 877 [as valid subgenus].

Amauromyza is a morphologically diverse genus of at least 60 species. Boucher (2012b) provided the most recent treatment of the genus, revising the Canadian fauna and providing a list of world species. The genus is defined entirely by male genitalic characters, making it difficult to identify externally, although many species have a very high gena that can be> 1/3-1/2 the height of the eye (as in A. karli ), and all Delmarva species have four scattered rows of acrostichal setulae, no acrostichal setae, four dorsocentrals (the presutural seta is sometimes absent in species found elsewhere), erect to reclinate orbital setulae (proclinate or no setulae occur in a minority of species elsewhere), a weakly sclerotised frons that buckles anteriorly in preserved specimens, a costa that extends to vein M1 (to R4+5 in two European species), and a dark, heavily pigmented distiphallus that is surrounded by a spinulose membrane. Compounding this difficulty in identification, the most diagnostic character of the genus, a sclerotised, bowl-shaped sperm pump, is also found in some Nemorimyza , Liriomyza and Agromyzinae . A stout, semi-circular hypandrium is also characteristic, but this character is also found infrequently elsewhere in the subfamily. Previously, those phytomyzine species with a dark or spotted halter could be quickly assigned to the genus, but Zlobin (1996) produced a more thorough definition of Amauromyza and discovered that this character was paralleled elsewhere, albeit uncommonly.

Three subgenera were recognised as occurring in the Nearctic by Spencer and Steyskal (1986b): Cephalomyza Hendel, Catalpomyza Spencer and Annimyzella Spencer (now a synonym of Nemorimyza ; Zlobin 1996). A fourth subgenus, Trilobomyza Hendel, which contains the introduced and increasingly widespread A. flavifrons , was included as a junior synonym of Cephalomyza , although Spencer (1987) used it as valid only a year later. The nominal subgenus is restricted to the Old World. Zlobin (1996) stated that the validity of the subgenera was uncertain, and they are not considered in the present revision pending future study to determine whether or not they are both monophyletic and useful for diagnosis.