Winnertzia fusca 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 : 36-37

Winnertzia fusca Kieffer

Fig. 66

Several male Winnertzia in our material are undoubtedly conspecific with W. fusca Kieffer as redescribed by Spungis (1992), thereby providing the first records of this species in Sweden. While Spungis (1992) reared his specimens from larvae found under the decaying bark of a birch tree, our specimens came mostly from forests predominated by other broadleaf trees, particularly oak, but also alder and aspen.

Diagnosis. This dark-brown species is one of the largest Winnertzia known to us, with male body lengths exceeding 3 mm. The eye bridge is 5–7 ommatidia long dorsally, thus longer than in most other Winnertzia . In all our specimens the tarsi are brighter (yellow?) than the proximal leg segments (brown?), a peculiarity that W. fusca shares with W. arctostylus , a new species described below. The genitalic structures of male W. fusca are reminiscent of that found in W. nigripennis , the distinctions being as follows ( Fig. 66 ). The gonocoxal synsclerite, which is conspicuously long, has a large non-setose area ventroanteriorly; the robust gonostylus is markedly shorter and straight rather than bent; the outline of the tegmen, especially the apex and the flaps, is more sharply contoured; and the aedeagal apodeme lacks an apical collar. We noticed some variability among our specimens, notably regarding the density of the ventral gonocoxal setae ( Fig. 66 depicts a specimen with very dense setae), the extent of the nonsetose gonocoxal portion, the size of the parameral apodemes, and the outline of the aedeagal apodeme.

Distribution in Sweden. Most of our specimens (n = 12) are from the southern half of Sweden, from Skåne in the south to Dalarna in the north. This might indicate that W. fusca is only sparsely distributed in the boreal forest zone.

Material studied. Sweden: 1 male, Skåne, Malmö, Limhamns kalkbrott, 11–27 May 2009, MT , B.W. Svensson et al. (spn GULI000020979 in NHRS) ; 1 male, Halland, Halmstad, Visberget , forest predominated by oak trees, 4 May–10 June 2019, flight intercept trap on oak tree, M. Lindström (spn CEC 2941 in NHRS) ; 1 male, Halland, Laholm, Timmershult , dry oak forest, 17 May–12 June 2019, pitfall trap, M. Lindström (spn CEC 2942 in SDEI) ; 1 male, Småland, Nybro, Bäckebo , Grytsjön NR, moist hay meadow at forest edge, 20 May–4 June 2005, Malaise trap, SMTP (trap 1001, collection event 1328) (spn CEC 2950 in NHRS) ; 1 male, same locality but thin aspen forest, 15 May–16 June 2015, MT, MCJ (spn CEC 2944 in SDEI) ; 1 male, Östergötland, Ödeshög, Omberg , Storpissan NR, old-growth spruce forest, 18 June–20 July 2009, MT, MCJ (spn GULI000020980 in NHRS) ; 1 male, Södermanland, Tyresö, Åva, Spirudden , coastal forest predominated by oak trees, 28 May–16 June 2004, MT, SMTP (trap 1, collection event 316) (spn CEC 2949 in NHRS) ; 2 males, Uppland , Uppsala, Ekdalen NR, young broadleaf forest with old oak trees, 17 May–2 June 2004, MT, SMTP (trap 27, collection event 486) (spns CEC2945 – CEC 2946 in NHRS) ; 1 male, same locality but 26 May–13 June 2005, SMTP (trap 27, collection event 1701) (spn CEC 2947 in SDEI) ; 1 male, Dalarna, Säter, Säterdalen, Näsåkerspussen , alder wood, 18–31 May 2005, MT, SMTP (trap 10, collection event 1621) (spn CEC 2948 in SDEI) ; 1 male, Västerbotten, Vindeln, Kulbäcksliden Experimental Forest , Degerö stormyr, bog, 1–22 September 2004, MT, SMTP (trap 59, collection event 1286) (spn CEC 2951 in SDEI) .

Figures

FIGURES 63–66. Male morphology of Winnertzia bulbifera agg. (63–65) and Winnertzia fusca (66). 63: Winnertzia “bulbifera A”, gonostylus, ventral, specimen from Östergötland. 64: Winnertzia “bulbifera B”, gonostylus, ventral, specimen from Östergötland.. 65: Winnertzia “bulbifera C”, gonostylus, ventral, specimen from Uppland. 66: Genitalia, ventral, specimen from Uppland. Scales 0.05 mm.