Winnertzia nigripennis Kieffer

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 : 39

Winnertzia nigripennis Kieffer

Of the six males used to redescribe W. nigripennis in our earlier revision of Winnertzia in Sweden ( Jaschhof & Jaschhof 2013: 92), two are revealed here as misidentifications (see W. ombergensis , a new species described below). While we are not aware of other specimens of W. nigripennis from Sweden, we know that there are three sibling species (spns CEC3266–CEC 3269 in SDEI). These siblings, which we leave unidentified for now, share with W. nigripennis the following similarities: the subcylindrical, slightly bent gonostylus is conspicuously long; the gonostylar claw is moderately large; the basolateral apophysis is large and angulated; the tegmen is tapered towards the narrowly rounded apex; the gonocoxal emargination is broadly V- to U-shaped and accompanied by a fairly large unsclerotized area basally; the medial bridges of the gonocoxae are bulging medially; the dorsal apodemes are long and thin; and the posterior edge of the ninth tergite is broad and concave medially ( Jaschhof & Jaschhof 2013: fig. 40C). Interspecific differences concern the length / width ratio of the flagellomeral node, the shape of the scales, the relative length of the fore tibia, the length of the empodium, and genitalic structures.

Diagnosis. Winnertzia nigripennis is a medium-sized, dark-brown Winnertzia , whose males can be identified by the following characters in combination. The eye bridge is 4–5 ommatidia long dorsally. The antenna has 12 flagellomeres, with all but the last flagellomere having translucent sensilla. Of the fourth flagellomere, the neck is 0.7 times as long as the node, and the node is 1.6 times as long as broad. The 4-segmented palpus is 1.4 times longer than the head height. Pronotal setae amount to 30 or more. The lateral mediotergal microtrichia are large; the parascutellar area is bright and vaguely contoured. The leg vestiture includes short, blunt-ended scales in large numbers. The fore tibia is 1.1 times longer than the second tarsomere. The empodia are vestigial, about one third as long as the claws. Genitalic characters of diagnostic merit are as follows ( Jaschhof & Jaschhof 2013: fig. 40C). The furrow at the base of the gonostylar claw is indistinct; the gonocoxal synsclerite is markedly convex ventroanteriorly; the tegmen is more strongly contoured on the basal half compared with the apical half; the tegminal flaps are faint; the parameral apodemes are long; of the aedeagal apodeme, the solid basal portion is long and the apical portion has a slight constriction followed by a collar-shaped broadening; and the posterior edge of the ninth tergite is darkly pigmented around the medial concavity.

Distribution in Sweden. Winnertzia nigripennis is known from a single series of males collected in Uppland ( Jaschhof & Jaschhof 2013: 92).