Winnertzia bicolor, 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 : 59-61

Winnertzia bicolor sp. nov.

Figs 106–108

A sample of ten males referred to in our earlier revision of Swedish Winnertzia as W. aff. divergens ( Jaschhof & Jaschhof 2013: 107) upon reexamination turned out to comprise two different species. One of these is described here as W. bicolor ; the other, which is left unnamed because our material is not sufficient for formal description, differs from W. bicolor in that conspicuous color contrasts are lacking, the flagellomeral necks are shorter, and in genitalic characters.

Diagnosis. A medium-sized to large, predominantly brown Winnertzia , whose males (females and preimaginal stages are unknown) have a bright yellow scutellum and bicolored flagellomeres with brownish nodes and yellowish necks. Genitalic characters diagnostic of this species are as follows ( Fig. 108 ). The gonostylus is straight (↓ 1), 2.5 times as long as broad, and equipped with a fairly broad pectinate claw. Of the tegmen, the lateral edges are faintly contoured and thus difficult to discern; the broadly rounded apex is strengthened (↓ 2); and the fairly large flaps have reinforced margins. The aedeagal apodeme, which is long and thick, has a slightly broadened apex and a long solid base. The dorsal apodemes of the gonocoxae, which are connected by a straight to slightly concave bridge, are moderately long (↓ 3). The ninth tergite, whose length equals that of the gonocoxae, has the posterior edge fairly narrow and shallowly indented (↓ 4).

Other male characters. Body size 2.1–2.7 mm. Head. Eye bridge 3–4 ommatidia long dorsally. Antenna two thirds as long as body. Scape larger than pedicel, both concolorous with flagellomeral nodes. 12 flagellomeres, flagellomeres 1–10 with translucent sensilla. Fourth flagellomere: neck 0.8–0.9 times as long as node; node 1.7 times as long as broad; sensory hairs numerous; both lateral and medial translucent sensilla slightly broadened, transversely or obliquely aligned, variously bent or U-shaped ( Figs 106–107 ). Palpus slightly longer than head height, 4 setaebearing segments; apical segment longest of all. Labella fully developed. Thorax. Pronotal setae 23–35.Anepimeral setae absent. Lateral mediotergal microtrichia large. Parascutellar area as bright as scutellum. Wing as long as body, 2.3 times as long as broad. Costal cell reinforced. M 4 long, slightly bent apically, CuA strongly bent, both veins extending to edge of wing. Legs with both pointed and blunt-ended scales. Basitarsal spines absent. Fore tibia and T 2 equally long. Acropods: claws slightly bent, basal tooth large; empodia nearly as long as claws. Abdomen. Pleural membrane setose. Genitalia ( Fig. 108 ). Ninth tergite: setae confined to posterior two thirds; anterior edge straight, indistinct. Gonocoxal synsclerite slightly broader than long; little narrowed towards base; ventral emargination broadly U-shaped, accompanied by extensive unsclerotized area basally; ventroanterior edge membranous, convex; ventro- and dorsoposterior portions ending at same level; lateral edges slightly concave. Basolateral apophysis of gonostylus small, angulated. Parameral apodemes large.

Etymology. The name is the Latin adjective for bicolored, referring to the yellow and brown hues typical of this species.

Type material. Holotype. Male , Sweden, Uppland , Håbo , Biskops-Arnö, elm grove, 15–28 June 2004, Malaise trap, Swedish Malaise Trap Project (trap 8, collection event 1557) (spn CEC 3084 in NHRS) . Paratypes. 2 males, same data but 20 June–18 July 2005 (spns GULI000020960 – GULI000020961 in NHRS) .

Other material studied. Sweden: 1 male, Skåne, Simrishamn, Stenshuvud NP, beech forest, 28 June–29 July 2010, MT, MCJ (spn GULI000020957 in NHRS) ; 1 male, Uppland , Uppsala, Fiby NR, swampy old-growth hemiboreal forest, 23 June–28 July 2009, MT, MCJ (spn GULI000020962 in NHRS) ; 1 male, same data but 9 June–23 July 2010 (spn SE 1952 in SDEI) ; 2 males, Öland, Mörbylånga , Stora Dalby lund NR, mixed broadleaf forest with plenty of dead ash, 8 June–8 July 2015, MT, MCJ (spns CEC3085 – CEC 3086 in SDEI) ; 1 male, Öland, Mörbylånga , Skogsby lund NR, mixed broadleaf forest with plenty of dead ash, 10 June–14 July 2015, MT, MCJ (spn CEC 3087 in SDEI) ; 1 male, Lule Lappmark , Jokkmokk, Kaltisbäcken NR, old growth herb-rich taiga, 4–30 July 2016, MT, MCJ (spn CEC 3088 in SDEI) .

Distribution and phenology. Adults were collected in June–July in different woodlands, both in southern (Skåne, Öland, Uppland) and northern Sweden (Lule Lappmark).

Figures

FIGURES 106–111. Male morphology of Winnertzia bicolor (106–108) and Winnertzia inornata (109–111), holotypes. 106: Fourth flagellomere, lateral. 107: Ditto, medial. 108: Genitalia, ventral. 109: Ditto. 110: Fourth flagellomere, lateral. 111: Ditto, medial. Scales 0.05 mm. Arrows refer to characters described in the diagnoses.