Winnertzia arctostylus, 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 : 42-44

Winnertzia arctostylus sp. nov.

Figs 70–73

Diagnosis. A medium-sized to large, dark-brown Winnertzia with distinctive male genitalic structures ( Fig. 70 ). A peculiarity of W. arctostylus is that the gonostylus is conspicuously thick basally, in a way that the portion next to the basolateral apophysis is more strongly convex than in other Winnertzia (↓ 4); the apophysis itself is unusually small, albeit strongly sclerotized. The gonocoxal synsclerite has an extensive non-setose portion ventroanteriorly; the ventral emargination is broadly V-shaped (↓ 5) and accompanied by a small membranous area basally; the medial bridges are bulging; and the dorsal apodemes are long and thin. The aedeagal apodeme is gently broadened towards the apex, with the broadest portion usually situated subapically (↓ 6). The posterior edge of the ninth tergite is broad and sinuous. Females and preimaginal stages of this new species are unknown. See W. fusca and W. nigripennis for two generally similar species.

Other male characters. Body size 2.2–2.6 mm. Head. Eye bridge 2–3 ommatidia long dorsally. Antenna almost two thirds body length. Scape slightly larger than pedicel, both concolorous with flagellum. 12 flagellomeres, translucent sensilla on flagellomeres 1–11. Fourth flagellomere: neck 0.6–0.7 times as long as node; node 1.8 times as long as broad; sensory hairs numerous; both lateral and medial translucent sensilla obliquely aligned, filiform, mostly variously U-shaped ( Figs 72–73 ). Palpus slightly shorter than head height, 4 setae-bearing segments; fourth segment longest of all. Labella of normal size. Thorax. Pronotal setae about 20. Anepimeral setae absent. Lateral mediotergal microtrichia large. Parascutellar area bright, sharply contoured. Wing as long as body, 2.7 times as long as broad. Costal cell reinforced. M 4 long, gently bent just as CuA, both veins extending to edge of wing. Legs with both pointed and blunt-ended scales. Tarsi brighter than more proximal segments. Basitarsal spines absent. Fore tibia and T 2 equally long. Acropods: claws slightly bent, basal tooth large; empodia two thirds as long as claws. Abdomen. Pleural membrane with setae and scales. Genitalia ( Fig. 70 ). Ninth tergite three fourths as long as gonopodal length; setae confined to lateroposterior portions; anterior edge straight, distinct. Gonocoxal synsclerite broader than long; lateral edges slightly concave; ventroanterior edge distinct, almost straight; ventro- and dorsoposterior portions ending at about same level. Gonostylus about 2.5 times as long as broad, usually oriented slightly dorsad and thus appearing shorter in ventral view, parallel-sided; pectinate claw small, below the claw a slight convexity, which is more obvious in non-inclined gonostyli ( Fig. 71 ). Aedeagal bulge with widely spaced rows of tiny spikes. Tegmen slightly tapered towards broadly rounded apex, sharply contoured; flaps large, faintly contoured; parameral apodemes large.

Etymology. The name, a noun in apposition, refers to the thick gonostyli typical of this species.

Type material. Holotype. Male , Sweden, Öland , Mörbylånga, Färjestaden, backyard with grove of young birch trees, 10 June–10 July 2015, Malaise trap, M. & C. Jaschhof (spn CEC 2995 in NHRS) . Paratypes. 2 males, same data as the holotype (spns CEC2996 – CEC 2997 in NHRS) ; 2 males, same data but 11 July–18 August 2015 (spns CEC2998 – CEC 2999 in SDEI) .

Other material studied. Sweden: 1 male, Öland, Mörbylånga, Vickleby ädellövskog NR, mixed broadleaf forest with plenty of dead ash trees, 15 July–17 August 2015, MT, MCJ (spn CEC 3000 in SDEI) ; 1 male, Småland, Nybro, Bäckebo, Grytsjön NR, old-growth thin aspen forest, 17 June–18 July 2015, MT, MCJ (spn CEC 3001 in NHRS) .

Distribution and phenology. All our specimens were collected in summer 2015 at three different sites in southern Sweden (Småland, Öland). The same areas were sampled also in other years without obtaining more specimens.

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.