Phytomyza vancouveriella, 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 : 89-90

publication ID	https://doi.org/ 10.11646/zootaxa.4479.1.1
publication LSID	lsid:zoobank.org:pub:93C84828-6EEF-4758-BEA1-97EEEF115245
DOI	https://doi.org/10.5281/zenodo.5997958
persistent identifier	https://treatment.plazi.org/id/03D287EF-FFF8-E413-A8E5-51E34274FC61
treatment provided by	Plazi
scientific name	Phytomyza vancouveriella
status	sp. nov.

Treatment

Phytomyza vancouveriella View in CoL spec. nov.

( Figs. 214 View FIGURES 208–216 , 383–388 View FIGURES 383–388 )

Holotype. OREGON: Lane Co., H.J. Andrews Experimental Forest , 22.vii.2016, em. 22.viii.2016, M.W. Palmer, ex Vancouveria hexandra , #CSE3046, CNC654338 View Materials (1♂) .

Paratypes. OREGON: same collection as holotype, CNC 654339–654341 (2♂ 1♀).

Etymology. The specific epithet refers to the host plant, Vancouveria C. Morren & Decne.

Host. Berberidaceae : Vancouveria hexandra (Hook.) C. Morren & Decne.

Leaf mine. ( Fig. 214 View FIGURES 208–216 ) Whitish, contorted linear-blotch, more or less full-depth, with frass in scattered black grains. Feeding lines are sometimes evident.

Puparium. Brown; formed outside the mine.

Distribution. USA: OR. An identical leaf mine has been found in WA (E. Stansbury, in litt.).

Adult description. Wing length 2.3–2.6mm (♂), 2.6mm (♀). Eye height divided by gena height: 5.4–7.0. First flagellomere slightly longer than wide, rounded and tapering apically with slightly longer hairs along distal margin. Cheek very narrow, not sharply defined. Notum pruinose. Vein dm-cu absent.

Chaetotaxy: Two ors (posterior ors thinner, 3/5–4/5 length), two ori (anterior ori thinner, 4/5 length). Ocellar seta subequal to posterior ors. Postvertical subequal to anterior ors. Four dorsocentral setae, decreasing in length anteriorly. Acrostichal setulae in five to six scattered rows.

Coloration: Setae dark brown. Head mostly light yellow; lunule with brown tint; antenna, large rounded dark brown spot around tubercle (broadly confluent with back of head), minute spots at base of ori, clypeus, palpus and back of head dark brown; posterolateral corner of frons dark brown to base of inner vertical seta, continuing anterior as stripe along orbital plate that is paler brown past posterior ors and ends at anterior ors. Remainder of body brown to dark brown with light brown pruinosity that sometimes has bluish tint on notum; apex of fore coxa yellowish; apex of fore femur with apical light yellow spot that is as long as wide; female mid and hind femora with similar light yellow spots; base of fore tibia yellowish. Calypter margin white, hairs brown. Haltere white.

Genitalia: ( Figs. 383–388 View FIGURES 383–388 ) Surstylus small, rounded, fused to epandrium; small, thin sclerotized plate on posterior margin of epandrium. Hypandrium triangular, pointed. Postgonite simple, short, with one medial seta. Phallophorus short ventrally, long and pointed dorsally where it is partially fused to right sclerite of basiphallus; flanked by one pair of irregularly sclerotized bands that are tapered at ends and widest past midpoint. Basiphallus composed of two narrow sclerites that are slightly upcurved, and weak and irregularly sclerotized apically; left sclerite shorter, darker to base. Hypophallus composed of one pair of short, dark sclerites that bend inwards at midpoint where they fuse to form ventromedial fold. Paraphallus dark, band-like, basal margin irregular, apices converging below anteroventral surface of mesophallus; positioned lateral to mesophallus (not ventrally or ventrolaterally). Mesophallus cylindrical, dark, ventrally curved, width almost 1/5 length, slightly swollen at base and apex; ventromedial surface produced as short plate in front of duct insertion; fused to distiphallus. Distiphallus entirely divided into two narrow sclerotized tubules that taper apically and are about as long as mesophallus; slightly converging apically, strongly curved at base, with apices pointed dorsally. Ejaculatory apodeme welldeveloped, stem short; sperm pump with transverse sclerotized band along venter with one pair of dark patches at upturned ends.

Comments. The adult of Phytomyza vancouveriella is distinct in having the anterior and posterior frontoorbitals only slightly shortened, the antenna is dark brown, the orbital plate is dark brown to the posterior ors and brown to the anterior ors with additional spots at the base of the ori, the first flagellomere is relatively narrow with longer apical hairs, the brown tint on the lunule contrasts with the bright yellow frons, the thorax is dark with a brownish to bluish pruinosity and at least the fore femur has a strong yellow apical spot. While this species does not key easily using Spencer & Steyskal (1986), it will approximate P. aquilegioides Sehgal (Alaska, Alberta, California), which has an entirely yellow orbital plate and entirely different genitalia.

The distiphallus of Phytomyza vancouveriella is most unusual in having a relatively short hypophallus sclerite that is stout basally and narrow, incurved and medially folded distally, the paraphallus is dark, curved, lateral (not ventrolateral) and with an irregular outline, the mesophallus is strong, curved, narrow and swollen basally and apically, and the distiphallus tubules are very narrow, as long as the distiphallus and strongly curved dorsally ( Figs. 387, 388 View FIGURES 383–388 ).

This is the first record of any agromyzid from Berberidaceae .