Winnertzia graduata Spungis

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 : 37

Winnertzia graduata Spungis

Diagnosis. A small to medium-sized, brown Winnertzia , whose male genitalic structures are specific to this species, as follows ( Jaschhof & Jaschhof 2013: fig. 38A–B). A good character is the ninth tergite whose posterior portion is narrow and bilobed, the lobes being darkly pigmented and separated by a deep U-shaped indentation. The gonocoxal synsclerite resembles that of W. curvata , the differences being that in W. graduata the bulge of the medial bridges is more pronounced, and the dorsal apodemes are slightly longer. The gonostyli of both species are also largely similar, except for the somewhat greater length in W. graduata . The tegmen is on the basal two thirds sharply contoured, while the apex, which is suddenly narrowed, is completely membranous and faint; the parameral apodemes are conspicuously broad. The basal edge of the aedeagal bulge is vaguely indicated rather than clear-cut.

Discussion. Given the striking conformity in male genitalic structures, W. graduata and W. curvata may be regarded as sister species. If the strongly emarginated ninth tergite is an indicator of relationship, then W. incisa , a new species described below, should be closely related to this species pair.

Distribution in Sweden. Specimens studied here of W. graduata , altogether 45 males, were collected in nine biological provinces in Sweden, from Halland to Lule Lappmark, which equals the distribution of W. curvata .

Material studied. Specimens listed by Jaschhof & Jaschhof (2013) and as follows. Sweden: 2 males, Halland, Laholm, Blåalt NR, oak-dominated forest, 15 May–12 June 2019, flight interception trap on oak, M. Lindström (spn CEC 2841 in NHRS, spn CEC 2834 in SDEI); 1 male, Gotland, Rembs , pine forest, 13–20 July 2003, MT, SMTP (trap 29, collection event 254) (spn CEC 2842 in NHRS) ; 1 male, Södermanland, Haninge, Tyresta NP, Urskogsslingan , pine forest, 4–26 August 2003, MT, SMTP (trap 3, collection event 109) (spn CEC 2843 in NHRS) ; 1 male, same data but spruce forest (trap 4, collection event 114) (spn CEC 2844 in NHRS); 1 male, Uppland, Uppsala, Fiby NR, swampy mixed boreal forest, 9 June–23 July 2010, MT, MCJ (spn CEC 2835 in SDEI) ; 2 males, Dalarna, Orsa, Gåsberget NR, swampy mixed boreal forest, 25 June–18 July 2018, MT, MCJ (spns CEC2837 – CEC 2838 in SDEI) ; 1 male, Orsa , 4 km NW Ejheden, recently burnt mixed boreal forest, 26 June–18 July 2018, MT, MCJ (spn CEC 2839 in SDEI) ; 3 males, Västerbotten, Vindeln, Svartberget Experimental Forest, Åheden , pine forest, 9–23 July 2004, MT, SMTP (trap 61, collection event 1301) (spns CEC2845 – CEC 2847 in NHRS) ; 1 male, Vindeln, Kulbäcksliden NR, tall mixed boreal forest, 4 July–18 August 2009, MT, MCJ (spn CEC 2836 in SDEI) ; 1 male, Lule Lappmark, Jokkmokk, Luottåive NR, swampy mixed boreal forest, 29 June–29 July 2016, MT, MCJ (spn CEC 2840 in SDEI) .