Phytomyza fricki (Griffiths)

Eiseman, Charles S. & Lonsdale, Owen, 2018, New state and host records for Agromyzidae (Diptera) in the United States, with the description of thirty new species, Zootaxa 4479 (1), pp. 1-156 : 73-74

Phytomyza fricki (Griffiths)

( Figs. 187–188 )

Material examined. IDAHO: Boundary Co., Bonners Ferry , Two Mouth Lakes , 29.ix.2012, em. 28.iv.2013, C.S. Eiseman, ex Symphoricarpos , #CSE363, CNC422906–422916 (6♂ 5♀) ; WYOMING: Park Co., 25.ix.2012, em. 28.iv.2013, C.S. Eiseman, ex Symphoricarpos , #CSE368, CNC358478–358481 (3♂ 1♀) .

Hosts. Caprifoliaceae : Symphoricarpos albus (L.) S.F. Blake, S. rotundifolius A. Gray ( Griffiths 1974a; Spencer 1981).

Leaf mine. ( Figs. 187–188 ) According to Griffiths (1974a), larvae are solitary, forming mines “entirely on upper surface of leaf, appearing dull white or brown in reflected light, initially stellate (with short channels radiating from oviposition site in leaf parenchyma), then becoming irregular blotch (in some cases with short linear offshoots); faeces deposited as fine particles, mostly separated by less than 1/ 2 mm.” In the Idaho mines ( Fig. 187 ) several eggs were typically inserted in close proximity along the midrib (or occasionally a lateral vein), with each larva forming a branching mine to one side of it. The result was what appeared to be a single mine containing up to five larvae, centered on the midrib, with irregular radiating channels. The channels had whitish margins but were centrally suffused with brown. Frass was in black, discrete grains and small lumps, concentrated toward the middle of the composite mine. In Wyoming ( Fig. 188 ), there were one or two larvae per leaf forming mines that sometimes branched but did not have radiating channels. The mines were brown (with or without whitish margins) and irregular, generally appearing to be highly contorted linear mines, but some appeared to be irregular primary blotches. The dark frass particles tended to be concentrated in one area, with some scattered at random elsewhere.

Puparium. Yellowish-brown to reddish, formed within the mine, its anterior spiracles projecting through the upper epidermis.

Distribution. USA: CA, *ID, WA, *WY.

Figures

FIGURES 180–188. leaf mines; 180: Phytomyza clematiphaga Spencer in Clematis hirsutissima (puparium at left); 181: P. clematoides Spencer in Clematis ligusticifolia; 182: P. confusa spec. nov. in?Hydrophyllum virginianum; 183: same; 184: P. crassiseta Zetterstedt in Ƒeronica officinalis; 185: P. doellingeriae spec. nov. in Doellingeria umbellata; 186: P. erigeronis spec. nov. in Erigeron annuus; 187: Phytomyza fricki (Griffiths) in Symphoricarpos sp. (Idaho); 188: same (Wyoming).