Winnertzia acutistylus, Jaschhof & Jaschhof, 2020

Jaschhof, Mathias & Jaschhof, Catrin, 2020, Reevaluation of species richness in Winnertzia (Diptera, Cecidomyiidae, Winnertziinae), with descriptions of 37 new species from Sweden, Peru and Australia, Zootaxa 4829 (1), pp. 1-72 : 41-42

Winnertzia acutistylus sp. nov.

Figs 67–69

Diagnosis. A small to medium-sized, brown Winnertzia . Male genitalic characters specific to this species are as follows ( Fig. 69 ). The posterior edge of the ninth tergite, which is broadly rounded, has a pair of lobes inside bearing microtrichia and sparse setae (↓ 1). In almost all other species of the solidaginis group the ninth tergite is indented posteromedially and lacks inner lobes (but see W. egregia , a new species described below). The dorsal apodemes of the gonocoxae are unusually narrow and strongly bent at their bases (↓ 2). The gonostylus is markedly tapered towards the apex, which holds the conspicuously small pectinate claw (↓ 3). Females and preimaginal stages of W. acutistylus are unknown.

Other male characters. Body size 1.3–1.6 mm. Head. Eye bridge 2–3 ommatidia long dorsally. Antenna two thirds body length. Scape slightly larger than pedicel, both concolorous with flagellum. 11 flagellomeres, translucent sensilla on flagellomeres 1–10. Fourth flagellomere: neck 0.7 times as long as node; node 1.7 times as long as broad; sensory hairs numerous; translucent sensilla filiform, lateral sensillum obliquely aligned, medial sensillum longitudinally aligned, both variously bent ( Figs 67–68 ). Palpus shorter than head height, 4 setae-bearing segments; fourth segment longest of all. Labella of normal size. Thorax. Pronotal setae 9–12. Anepimeral setae absent. Lateral mediotergal microtrichia slightly enlarged. Parascutellar area bright, vaguely contoured. Wing as long as body, 2.4 times as long as broad. Costal cell slightly reinforced. M 4 long, almost straight, CuA moderately bent, both veins extending to edge of wing. Legs. Scales pointed. Basitarsal spines absent. Fore tibia 1.4 times as long as T 2. Acropods: claws slightly bent, basal tooth large; empodia as long as claws. Abdomen. Pleural membrane with setae and scales. Genitalia ( Fig. 69 ). Ninth tergite two thirds gonopodal length; anterior edge distinct, straight; setae confined to posterior portions. Gonocoxal synsclerite broader than long; ventral emargination shaped like a widely open U, membranous basally; ventroanterior edge convex; ventro- and dorsoposterior portions ending at same level; dorsal apodemes long and thin. Gonostylus twice as long as broad; basolateral apophysis normal size, little angulated. Aedeagal bulge with closely spaced rows of tiny spikes. Aedeagal apodeme thick, parallel-sided; solid basal portion long. Tegmen gently tapered towards apex, on basal two thirds sharply contoured; apex membranous, broadly rounded; flaps large, vaguely contoured; parameral apodemes long, directed ventrolaterad.

Etymology. The name, a noun in apposition, refers to the pointed gonostylus characteristic of this species.

Type material. Holotype. Male , Sweden, Småland , Högsby, Allgunnen Nature Reserve, 3 km N Uddevallshyltan, mixed coniferous / broadleaf forest, 19 June 2014, sweepnet and aspirator, M. & C. Jaschhof (spn CEC 3027 in NHRS) . Paratype. 1 male, Småland, Nybro, Bäckebo, Grytsjön NR, mixed forest of conifers and aspen trees, 17 July–21 August 2015, MT, MCJ (spn CEC 3028 in SDEI) .

Distribution and phenology. Winnertzia acutistylus is known from two specimens collected as singletons in two different, mixed forests in Småland. The collection data suggest the adult flight period is June–August.

Figures

FIGURES 67–73. Male morphology of Winnertzia acutistylus (67–69) and Winnertzia arctostylus (70–73). 67: Fourth flagellomere, lateral, paratype. 68: Ditto, medial. 69: Genitalia, ventral, holotype. 70: Ditto. 71: Gonostylus, ventral, paratype. 72: Fourth flagellomere, lateral, holotype. 73: Ditto, medial. Scales 0.05 mm. Arrows refer to characters described in the diagnoses.