Phytomyza thermarum (Griffiths)

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 : 38

Phytomyza thermarum (Griffiths)

( Fig. 85 )

Material examined. VERMONT: Windham Co., Marlboro, Hogback Mountain , 42.852158, -72.797828, 21.vi.2018, em. 4.vii.2018, C.S. Eiseman, ex Erigeron pulchellus , # CSE4720 , CNC1135661 (1♁).

Hosts. Asteraceae : Erigeron philadelphicus L. ( Griffiths 1976), E. * pulchellus Michx.

Larval mine. ( Fig. 85 ) Partly in the stem, petiole, and basal part of the leaf midrib, with whitish linear channels radiating into the blade. These channels are mostly more or less full-depth but may be on the upper or lower surface. Frass is mostly in discrete grains (partly forming beaded strips in most mines according to Griffiths (1976)).

Puparium. White or yellowish-white, formed within the mine, either in the petiole or on the lower surface of the blade, with its anterior spiracles projecting ventrally through the epidermis ( Griffiths 1976).

Phenology and voltinism. This species is evidently multivoltine in western Canada, with larvae collected in early June emerging as adults within two weeks, larvae and puparia collected in mid-July emerging as adults in late July and early August, and those collected in early September emerging as adults within a month ( Griffiths 1976).

Distribution. * USA: VT; Canada: AB, BC ( Griffiths 1976). Mines possibly representing this species have been found on Erigeron philadelphicus in PA ( Schultz 2020).

Figures

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.