Revision of the Canadian species ofAmauromyzaHendel (Diptera: Agromyzidae)

Abstract

The Canadian fauna of the genus Amauromyza Hendel (Diptera: Agromyzidae) is revised and contains 11 species: Amauromyza abnormalis (Malloch), A. angulicornis Zlobin, A. flavifrons (Meigen), A. karli (Hendel), A. luteiceps (Hendel), A. nevadensis Spencer, A. pleuralis (Malloch), A. riparia Sehgal, A. scleritica Spencer, A. shepherdiae Sehgal, and A. subinfumata (Malloch). Among these, three species (A. luteiceps, A. nevadensis, and A. scleritica) are here newly recorded in Canada and A. angulicornis newly recorded in the United States of America. Other species are significantly more widespread in Canada than previously recorded. All species are redescribed and a new identification key to Canadian species is provided.

Manual of North American Agromyzidae (Diptera, Schizophora), with revision of the fauna of the “Delmarva” states

“…The shape of the distiphallus of the dissected male from Maryland is of an intermediate morphology between those illustrated from California and Quebec in , being quite similar to the New Mexico specimen photographed in Boucher (2012b). These intermediates support the concept of a single morphologically variable species, not two separate species, as suggested by .…”

“…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 M 1 (to R 4+5 in two European species), and a dark, heavily pigmented distiphallus that is surrounded by a spinulose membrane.…”

“…The illustration of the Californian male in , however, has a very strong resemblance to the British male illustrated by Spencer (excluding a slight strengthening of the apex of the basiphallus and a basal proliferation of spinules on the membrane surrounding the distiphallus), and it is uncertain as to what specifically he used as evidence to differentiate the two. The status of A. chenopodivora was treated in Boucher (2012b), who examined material from Sweden and found that the specimens were slightly larger with differences in the phallus and concluded that they were distinct from those in the Nearctic. Chaetotaxy: Two or three ori; two or three ors (rarely one).…”

“…Spencer 1969: 158, 1977. Amauromyza (Cephalomyza) karli Gil-Ortiz et al 2009, Boucher 2012b. Černý 2018: 123; Černý et al 2020: 201.…”

Diptera of Canada

“…The Canadian Agromyzidae were revised by Spencer (1969), but since that time generic concepts have been extensively reconsidered, especially in Winkler et al (2009) and Lonsdale (2014), and several genera have been revised: Amauromyza Hendel (Boucher 2012b); Cerodontha Rondani (Boucher 2002, 2003, 2008, 2012a); Liriomyza Mik (Lonsdale 2017a); Pseudonapomyza Hendel (Boucher 2004). Many north temperate species of Phytomyza (sometimes as “ Chromatomyia Hardy”) were treated in a long series of papers by GCD Griffiths.…”