Winnertzia hamatula, 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 : 61-62

Winnertzia hamatula sp. nov.

Jaschhof & Jaschhof 2013: fig. 47E (depicting the holotype designated here)

Diagnosis. This medium-sized, brown Winnertzia with long antennae and wings was previously subsumed under W. tridens , a species with largely similar male morphology. Among the species close to W. tridens , W. hamatula is distinguished by the aedeagal apodeme whose apical processes are much smaller, and the long gonostylus whose outline resembles a slightly bent club, i.e. the base is conspicuously slender and the apex broadly rounded ( Jaschhof & Jaschhof 2013: fig. 47E). Females and preimaginal stages of W. hamatula remain unrecognized.

Other male characters. Body size 1.6–1.7 mm. Head. Eye bridge 3–4 ommatidia long dorsally. Antenna as long as body. Scape slightly larger than pedicel, both yellowish, lighter than flagellum. 12 flagellomeres, flagellomeres 1–10 with translucent sensilla. Fourth flagellomere: neck 1.1 times as long as node; node twice as long as broad; sensory hairs numerous; translucent sensilla filiform to slightly broadened, lateral sensillum transversely aligned, variously bent to U-shaped, medial sensillum longitudinally aligned. Palpus slightly longer than head height, 4 setae-bearing segments; apical segment longest of all. Labella fully developed. Thorax. Pronotal setae 15–18. Anepimeral setae absent. Lateral mediotergal microtrichia large. Parascutellar area bright, vaguely contoured. Wing slightly longer than body, 2.4 times as long as broad. Costal cell reinforced. Both M 4 and CuA gently bent, extending to edge of wing. Legs with both pointed and blunt-ended scales. Basitarsal spines absent. Fore tibia 0.9 times as long as T 2. Acropods: claws slightly bent, basal tooth large; empodia vestigial. Abdomen. Pleural membrane setose. Genitalia ( Jaschhof & Jaschhof 2013: fig. 47E). Ninth tergite considerably shorter than gonocoxae; setae largely confined to posterior and lateral portions; anterior edge distinct; posterior edge broadly rounded to slightly concave. Gonocoxal synsclerite broader than long; ventral emargination broadly U-shaped, sclerotized basally; ventroanterior edge distinct, straight; dorsoposterior portions protruding markedly beyond ventroposterior portions; dorsal apodemes long and thin. Basolateral apophysis of gonostylus fairly large, very slightly angulated. Solid basal portion of aedeagal apodeme long. Tegmen faintly contoured; flaps small, indistinct; parameral apodemes long, directed ventrolaterad.

Etymology. The name is a Latin adjective meaning ̒with small hooks’, which refers to the outline of the aedeagal apodeme found in this species.

Type material. Holotype. Male , Sweden, Uppland , Knivsta, Rickebasta Nature Reserve, swamp forest of alder, 1–27 August 2009, Malaise trap, M. & C. Jaschhof (spn SE 1930 in NHRS) . Paratypes. 1 male, same data as the holotype but 25 June–31 July 2009 (spn GULI000021518 in NHRS) ; 2 males, same data but 25 June 2009, sweepnet and aspirator (spns GULI000026515 and GULI000026521 in NHRS) .

Other material studied. Sweden: 1 male, Skåne, Simrishamn, Stenshuvud NP, hornbeam and alder swamp forest, 17 June 2009, sweepnet and aspirator, MCJ (spn GULI000021580 in NHRS) ; 3 males, same locality but broadleaf forest predominated by beech, 16 June–31 July 2009, MT (spns GULI000021582 , -21583 and - 21589 in NHRS) ; 1 male, same locality but beech forest, 28 June–29 July 2010 (spn GULI000021607 in NHRS) ; 1 male, Öland , Borgholm, Skepparsäng NR, dry pine forest, 22 July–23 August 2015, MT, MCJ (spn CEC 3179 in SDEI) .

Distribution and phenology. All our specimens were collected in June–August in both broadleaf and coniferous forests in the southern half of Sweden (Skåne to Uppland).