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

Phytomyza notopleuralis Spencer

( Figs. 58 , 84 )

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 (1♁ 1♀) .

Host. * Cornaceae : Cornus sericea L.

Leaf mine. ( Fig. 84 ) 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 ) (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.

Figures

FIGURES 48–58. Figures 48–52: Phytomyza flavilonicera Eiseman & Lonsdale, spec. nov.; 48: paratype female habitus; 49: paratype male dorsal; 50: same, lateral; 51: same, head; 52: puparium. Figures 53–56: P. triostevena Eiseman & Lonsdale, spec. nov., holotype; 53: dorsal; 54: lateral; 55: head; 56: puparium. Figure 57: P. flavicornis Fallén, puparia. Figure 58: P. notopleuralis Spencer, female.

FIGURES 73–86. Mines of Phytomyzinae on host plants: 73: Liriomyza blechi Spencer on Ruellia carolinensis; 74: Liriomyza cf. cracentis Lonsdale on Ageratina altissima; 75: L. euphorbivora Eiseman & Lonsdale, spec. nov. on Euphorbia marginata; 76: L. hypopolymnia Eiseman & Lonsdale, spec. nov. on Polymnia canadensis, upper surface; 77: same, lower surface; 78: L. orilliensis on Nabalus sp.; 79: L. cf. taraxaci Hering on Krigia virginica; 80: L. trifolii (Burgess) on Mecardonia acuminata; 81: Phytomyza cf. aesculi Eiseman & Lonsdale on Aesculus flava; 82: P. flavilonicera Eiseman & Lonsdale, spec. nov. on Lonicera sempervirens; 83: same; 84: P. notopleuralis Spencer on Cornus sericea; 85: P. thermarum (Griffiths) on Erigeron pulchellus; 86: P. triostevena Eiseman & Lonsdale, spec. nov. on Triosteum sp.