Phytomyza doellingeriae, Eiseman & Lonsdale, 2018

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 : 72

Phytomyza doellingeriae spec. nov.

( Figs. 39, 41 , 185 , 321–325 )

Holotype. MAINE: Washington Co., Perry, Sipp Bay—Old County Rd. , 24.viii.2013, em . 20.iii.2014, C.S. Eiseman, ex Doellingeria umbellata , #CSE1013, CNC358469 (1♂).

Etymology. The specific epithet refers to the host plant, Doellingeria Nees.

Host. Asteraceae : Doellingeria umbellata (Mill.) Nees.

Leaf mine. ( Fig. 185 ) Whitish, upper surface, narrow, entirely linear; frass in closely spaced grains or beaded strips along the sides.

Puparium. ( Fig. 39 ) Blackish; formed outside the mine.

Distribution. USA: ME.

Adult description. Wing length 2.1mm (♂). Female unknown. Eye height divided by gena height: 5.6. First flagellomere rounded, apical hairs slightly longer. Notum subshining. Vein dm-cu absent.

Chaetotaxy: Two ors, posterior seta weak, half length; two ori, posterior seta strong (evident from sockets), anterior ori weak, subequal to posterior ors. Ocellar and postvertical setae subequal to anterior ors. Four dorsocentral setae, slightly decreasing in length anteriorly. Acrostichal setulae in four to five scattered rows.

Coloration: ( Fig. 41 ) Setae dark brown. Head mostly light yellow; palpus, clypeus, back of head excluding yellow venter, posterior margin of vertex, first flagellomere and ocellar spot (slightly larger than tubercle) dark brown; pedicel and scape brown; posterolateral corner of frons dark brown lateral to vertical setae, but narrow stripes from vertex reaching base of setae; region behind ocellar spot brownish; venter of gena with light brown line. Thorax dark brown with postpronotum (excluding large spot), notopleuron and narrow lateral stripe along postsutural scutum light yellow, and dorsal ¼–1/3 of anepisternum with irregular light yellow stripe. Calypter margin light yellow, hairs brown. Haltere white. Legs dark brown with apices of femora light yellow (spot as long as wide) and base of tibiae narrowly light yellow. Abdomen dark brown.

Genitalia: ( Figs. 321–325 ) Surstylus small, rounded, with few short inner setae. Postgonite simple with one medial seta. Phallophorus short, wide; flanked by one pair of pale, pointed, rod-like sclerites. Basiphallus divided into one pair of very long, dark and narrow sclerites with irregular margins; right sclerite widened and abruptly angled to fuse to left sclerite subbasally; approximately two dozen minute spines along dorsal margin of middle half of left sclerite, one spine present distally on right sclerite. Hypophallus narrow, dark, U-shaped, more than half length of basiphallus. Paraphallus absent. Mesophallus cylindrical, clear, fused to distiphallus, 1/3 length of basiphallus. Distiphallus divided into two tubules as wide as, and nearly as long as mesophallus; tubules diverging, pigmented with apices clear. Ejaculatory apodeme small, blade pale and short, stem ill-defined; sperm pump with one pair of sclerotized lateral spots.

Comments. Phytomyza doellingeriae adults are dark with a mostly bright yellow head with a brown antenna that is black on the first flagellomere, there is one pair of light yellow stripes anterolaterally on the scutum and dorsally on the anepisternum, there are large light yellow spots on the femora, and the anterior and posterior frontoorbitals are reduced. These characters, combined with genitalic morphology, closely allies it to P. astotinensis Griffiths and P. phalangites Griffiths (see Griffiths (1976)), but the sclerotized distal region of the distiphallus of P. doellingeriae does not extend as a ventral plate down the basal half, the tubules of the distiphallus are not as strongly diverging, the mesophallus is longer, and the left half of the basiphallus does not have a raised spinulose basal section.

More rearings are needed to determine whether this species differs in phenology or larval mines from Phytomyza solidaginivora , which was found on the same host at the same locality.

Figures

FIGURES 35–43. Figure 35: Phytomyza actaeivora spec. nov., adult male. Figure 36: P. aesculi spec. nov., adult female. Figure 37: P. actaeivora, puparia. Figure 38: P. aesculi, puparium. Figure 39: P. doellingeriae spec. nov., empty puparium. Figure 40 P. confusa spec. nov., adult male. Figure 41: P. doellingeriae, adult male. Figures 42–43: P. erigeronis spec. nov.; 42: adult male; 43: puparium.

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).

FIGURES 321–325. Phytomyza doellingeriae spec. nov., male genitalia; 321: external components, posterior; 322: postgonite, left lateral; 323: ejaculatory apodeme; 324: phallus, ventral; 325: phallus, left lateral.