Phytomyza (P.) villosus Lonsdale sp. nov.

(Figs. 45–50)

Description. Wing length 3.0 mm (♂), 3.1 mm (♀). -+Vein dm-m absent. Eye height divided by gena height: 2.6– 3.7. First flagellomere small, rounded, slightly longer than high; distomarginal hairs a bit longer, becoming slightly longer dorsally where they are nearly as long as width of arista base.

Chaetotaxy: Most setae on type series missing or broken. Two ori, two ors; anterior ori slightly longer than orbital setulae; posterior ors (based on socket size) thinner than anterior ors, but perhaps not much shorter than it. Acrostichal setulae highly scattered, ranging from 4–6 across around transverse suture. Up to 10 intra-alar setulae extending to level of first dorsocentral. Four dorsocentral setae that strongly decrease in length anteriorly, with fourth seta, half-length of first.

Colouration: Setae dark brown. Head mostly light yellow with orbital plate and posterolateral region of frontal vitta paler; spot surrounding orbital tubercle, posterolateral corner of frons to level of inner vertical, antenna, clypeus, palpus and back of head dark brown; face brownish excluding lateral margin; ventral line on gena brown. Thorax dark brown with yellowish-white regions; darker regions supporting dense grey/brown tomentum that is sparser on pleuron; postpronotum, notopleuron and adjoining postsutural margin pale, excluding dark anterior spot on postpronotum and dark anterolateral line on notopleuron; remainder of lateral postsutural margin on scutum dark with whitish mottling; posterolateral corner of scutum with small, but conspicuous white spot adjoining side of entirely dark scutellum. Calypter pale with hairs brown. Legs mostly dark brown; apices of femora light yellow for length subequal to apical width of femora; bases of tibiae light yellow. Abdomen dark brown.

Genitalia: (Figs. 45–50) Epandrium fused to small, rounded surstylus. Cercus well-developed but narrow. Hypandrium narrowly subtriangular with short, weak apical apodeme; inner lobe with two setae. Postgonite relatively straight, with long inner subapical lobe and shallow inner medial lobe. Phallophorus narrow, angled dorsally; flanked basally by one pair of long flat bars that are paler and pointed apically. Basiphallus Y-shaped, with sclerites narrow and only the left sclerite extending along the dorsal surface of phallus as plate to meet the phallophorus. Hypophallus with dark V-shaped sclerite that curves to fuse to ends of similarly narrow basiphallus. Membranous surface of phallus above distal 2/3 of basiphallus bearing long, ovate and irregularly sclerotized plate supporting thick patch of spines. Broad membranous region between basiphallus and distiphallus laterally with one pair of weakly sclerotized, chevron-shaped paraphalli. Distiphallus not much longer than phallophorus, with rounded, weakly sclerotized base and one pair of slightly more sclerotized narrow, subparallel tubules that are slightly curved ventrally. Ejaculatory apodeme small, pale, atrophied and with base strongly asymmetrical; sperm pump with one pair of narrow, weakly sclerotized bands.

Host. Unknown, possibly Campanulaceae.

Etymology. The specific epithet is derived from the Latin for “tuft of hair”, referring to the concentrated patch of spines on the phallus.

Holotype: Georgia. Kakheti Region, Mt. Kudigora, H 6, 41°54.371′N, 46°20.004′E, 2559 m, G. Japoshvili, CNC488125 (1♂, CNC).

Paratypes: same data as holotype, CNC488081, CNC488134, CNC1583210 (1♂ 2♀, CNC; 1♂ AUGEC).

Comments. The concentrated patch of spines on the phallus above the basiphallus is known only from Phytomyza villosus and P. campanulae Hendel, the latter of which has been reared from species of Asyneuma, Campanula and Phyteuma (Campanulaceae) (Papp & Černý, 2020). The shape of the distiphallus, hypophallus and paraphallus are also quite similar. Phytomyza campanulae differs in having a darker scutum that is only paler brown laterally with the margin of the postpronotum whitish, and it is sometimes smaller, having a wing length ranging from 2.3–3.2 mm. With regards to the male genitalia, the sclerite of the hypophallus has a triangular anteromedial process on both sides, and the tubules of the distiphallus and the anteromedial surface of the basal section are better-sclerotized.