Phytomyza tarnwoodensis, 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 : 86

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.5997948
persistent identifier	https://treatment.plazi.org/id/03D287EF-FFF5-E41F-A8E5-52F843BFF95A
treatment provided by	Plazi
scientific name	Phytomyza tarnwoodensis
status	sp. nov.

Treatment

Phytomyza tarnwoodensis View in CoL spec. nov.

( Figs. 53, 56 View FIGURES 51–57 , 209 View FIGURES 208–216 , 366–371 View FIGURES 366–371 )

Holotype. MASSACHUSETTS: Hampshire Co., Pelham, 88 Arnold Rd. , 4.vii.2013, em. 5–12.vii.2013, C.S. Eiseman, ex Diervilla lonicera , #CSE654, CNC392674 View Materials (1♂) .

Paratypes. MASSACHUSETTS: same collection as holotype, CNC 392673, CNC 392675, CNC 392676 (3♀).

Etymology. Tarnwood is the name CSE’s parents gave to their property (at 88 Arnold Rd., Pelham, MA), where the type series was collected.

Host. Caprifoliaceae : Diervilla lonicera Mill.

Leaf mine. ( Fig. 209 View FIGURES 208–216 ) An upper surface, yellowish-green, elongate, more or less digitate blotch mine based on the midrib, containing several larvae.

Puparium. ( Fig. 56 View FIGURES 51–57 ) Brown; formed within the leaf, with the anterior end protruding from the lower epidermis; anterior spiracles on well separated, long, diverging stalks.

Distribution. USA: MA; we have seen similar mines in IA, ME, and NY.

Adult description. Wing length 1.9mm (♂), 1.9–2.0mm (♀). Eye height divided by gena height: 4.0–5.9. First flagellomere rounded. Notum lightly pruinose. Vein dm-cu absent.

Chaetotaxy: Two ors, two ori (anterior ori thin, setula-like, 1/3–½ length). Four dorsocentral setae, decreasing in length anteriorly. Acrostichal setulae in five irregular rows.

Coloration: ( Fig. 53 View FIGURES 51–57 ) Setae dark brown. Body dark brown with beige tint, covered with light brown pruinosity that is denser medial to intra-alar rows on scutum where it is slightly greenish with faint bluish tint; orbital plate beige to base of inner vertical seta (one female with only slightly pale tint); gena and postgena brown to beige excluding dark ventral line on gena; palpus and margin of vertex paler brown; scutum paler lateral to intra-alar row; fore femur with light yellow spot at apex that is ill-defined and as long as wide. Calypter margin yellow, hairs brown. Haltere yellow.

Genitalia: ( Figs. 366–371 View FIGURES 366–371 ) Surstylus small, rounded, fused to epandrium, inner-distal margin setose. Hypandrium rounded, two small setae on inner lobe. Postgonite simple, one medial seta. Phallophorus flanked by one pair of dark narrow bands. Basiphallus divided into two sclerites with tapered, upturned apices that shallowly interlock near base; left sclerite with basal arm wrapping around shaft; right sclerite with shallow dorsal subbasal lobe, dorsally fused to phallophorus. Hypophallus with one pair of lateral sclerites that are subrectangular basally, pointed and somewhat ventrally angled distally, width 1/3 length at widest point; otherwise membranous with long anteromedial flagellum. Mesophallus indistinct, incorporated into distiphallus as shallow stem. Distiphallus flattened, dark, angled upwards; in ventral view, medially divided into one pair of long, narrow lobes with rounded ends, darker base and medial fossa; with dark medial “V” imposed on lobes.

Comments. Phytomyza tarnwoodensis is similar to other Caprifoliaceae-miners—especially P. gregaria Frick and P. symphoricarpi Griffiths to which it keys in Griffiths (1974a), the best revision of these species—in being dark with a light brownish pruinosity, and having five rows of dorsocentral setulae, an unenlarged first flagellomere, a simple wedge-shaped hypophallus sclerite ( Fig. 371 View FIGURES 366–371 ) and a short, dorsally angled distiphallus that is flat in profile. It differs from these, however, in that the sclerite of the hypophallus is narrowly pointed on the distal half, the distiphallus is similarly split and lobate basally and distally (paler distally), and there is a dark “V” imposed medially ( Fig. 370 View FIGURES 366–371 ).

The only prior record of a leafminer using Diervilla (apart from Frost’s (1924) questionable report of Phytomyza persicae from D. lonicera ) is the irregular greenish blotch mine Spencer (1969) reported on D. lonicera in Quebec, made by an unidentified agromyzid. It is conceivable that he was describing the same mine. We have also reared Aulagromyza orbitalis from this host.