Phytomyza notopleuralis Spencer

Eiseman, Charles S., Lonsdale, Owen, Linden, John Van Der, Feldman, Tracy S. & Palmer, Michael W., 2021, Thirteen new species of Agromyzidae (Diptera) from the United States, with new host and distribution records for 32 additional species, Zootaxa 4931 (1), pp. 1-68: 36-37

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Phytomyza notopleuralis Spencer


Phytomyza notopleuralis Spencer  

( Figs. 58 View FIGURES 48–58 , 84 View FIGURES 73–86 )

Material examined. MASSACHUSETTS: Berkshire Co., Great Barrington , 42.197870, -73.335897, 17.ix.2017, em. ~ 16.iv.2018, C.S. Eiseman, ex Cornus sericea   , # CSE4416, CNC1144083–1144084 View Materials (1♁ 1♀) GoogleMaps   .

Host. * Cornaceae   : Cornus sericea L.  

Leaf mine. ( Fig. 84 View FIGURES 73–86 ) Entirely linear, on the upper leaf surface; frass in somewhat liquidy strips along the sides.

Puparium. Shining dark brown with paler brown intersegmental boundaries; formed outside the mine.

Phenology and voltinism. Our specimens were collected as larvae in mid-September and emerged as adults the following spring. There is presumably at least one earlier generation; the only other known specimens were collected as adults on 3 June (Ontario) and 9 July (Michigan) ( Spencer 1969; Spencer & Steyskal 1986).

Distribution. USA: *MA, MI; Canada: ON ( Spencer & Steyskal 1986).

Comments. Neither Spencer (1969) nor Spencer & Steyskal (1986) made any statements about the possible relationships of Phytomyza notopleuralis   to other Phytomyza   . Winkler et al. (2009) indicated that it is near P. spinaciae Hendel   , a Palearctic species mining leaves of Cynareae   ( Asteraceae   ) and forming a white puparium within the leaf, and placed it in the syngenesiae group. However, the leaf mine is identical with that of P. agromyzina Meigen   , which feeds on various dogwoods including Cornus sericea   , and the younger P. notopleuralis   may eventually prove to be its junior synonym. External morphology is nearly identical, excluding the presence of a strongly pale yellow notopleuron in P. notopleuralis   ( Fig. 58 View FIGURES 48–58 ) (yellowish tint with margins yellower in P. agromyzina   ), and the genitalia ( Spencer 1969: Fig. 470) only differ in that the distiphallus of P. agromyzina   is basally straight (not shallowly curved) and sometimes slightly abbreviated; the apex of the distiphallus is also sometimes a bit straighter. The phallus of P. agromyzina   illustrated in Spencer (1969: Fig. 395) shows the distiphallus as a simple membranous lobe without the narrow, apically forked and medially deviated sclerotized band; this is apparently an artifact of illustration, as this structure is present in all dissected material examined at the CNC.