Winnertzia silvestris, 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 : 69

Winnertzia silvestris sp. nov.

Figs 124–127 ; Jaschhof & Jaschhof 2013: fig. 45A (as W. pravdini )

Diagnosis. Males of this species can be recognized using the following characters in combination. The length of the eye bridge matches 4–5 lateral and 1–2 dorsal ommatidia; the neck of the fourth flagellomere is 1.1 times as long as the node ( Figs 124–125 ); the apical segment of the palpus is longer than each of the three preceding segments; pronotal setae number 9–17, anepimeral setae 5–9; the lateral mediotergal microtrichia are only little enlarged; the fore tibia is shorter than the second tarsomere (length ratio tb/T 2 = 0.8; Fig. 127 ); and the empodia are half as long as the claws whose basal tooth is as large as that usually found in Winnertzia ( Fig. 126 ). As regards genitalic characters ( Jaschhof & Jaschhof 2013: fig. 45A), the posterior edge of the ninth tergite is perfectly sinuous; the gonocoxal emargination, which is smaller than that of W. pratensis , extends only slightly beyond the midlength of the gonocoxal synsclerite; and the gonostylus has a conspicuously steep-walled apex. Additionally, males of W. silvestris are on average larger (1.5–2.0 mm) than that of W. pratensis (1.4–1.6 mm), a closely related species described above. Females and preimaginal stages of W. silvestris are unknown.

Etymology. The Latin adjective silvestris translates as forest-dwelling, referring to the habitat in which all our specimens were collected.

Type material. Holotype. Male, Sweden, Uppland, Uppsala, Fiby Nature Reserve , swampy section of oldgrowth mixed hemiboreal forest, 9 June–23 July 2010, Malaise trap, M. & C. Jaschhof (spn GULI000020956 in NHRS) . Paratypes. 1 male, Sweden, Skåne, Simrishamn, Stenshuvud National Park , old-growth mixed broadleaf forest, 16 June 2009, sweepnet, MCJ (spn GULI000020955 in NHRS) ; 1 male, Uppland, Knivsta, Rickebasta NR, swamp forest of alder interspersed with spruce trees, 1–27 August 2009, MT, MCJ (spn SE 1655 in SDEI) .

Other material studied. Sweden: 1 male, Öland, Mörbylånga, Färjestaden, backyard with grove of young birches, 10 June–10 July 2015, MT, MCJ (spn CEC 3054 in SDEI) ; 1 male, Småland, Nybro, Bäckebo, Grytsjön NR, old-growth mixed hemiboreal forest, 17 June–16 July 2015, MT, MCJ (spn CEC 3053 in SDEI) .

Distribution and phenology. The five specimens known of W. silvestris were collected in summer (June–Au-gust) in different woodlands in the southern half of Sweden (Skåne to Uppland).

Figures

FIGURES 119–127. Male morphology of Winnertzia pratensis (119–123) and Winnertzia silvestris (124–127). 119: Genitalia, ventral, holotype. 120: Acropod, lateral, paratype. 121: Fourth flagellomere, lateral, paratype. 122: Ditto, medial. 123: Tibia to second tarsomere of foreleg, lateral, holotype. 124: Fourth flagellomere, lateral, holotype. 125: Ditto, medial. 126: Acropod, lateral, holotype. 127: Tibia to second tarsomere of foreleg, lateral, holotype. Scales for 119, 121–122 and 124–125, 0.05 mm; for 120 and 126, 0.025 mm; for 123 and 127, 0.5 mm. Arrows refer to characters described in the diagnoses.