Winnertzia pustulatula, 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 : 66-68

Winnertzia pustulatula sp. nov.

Figs 128–131

Diagnosis. Males of this medium-sized (1.7–1.9 mm), brown Winnertzia are reminiscent of small W. pustulata (1.7–

2.3 mm). Differences between these two species are as follows. In W. pustulatula , the flagellomeres have shorter necks, the neck of the fourth flagellomere being 0.6 times as long as the node ( Figs 130–131 ) ( pustulata : 0.8–0.9); the fore tibia is 1.2–1.3 times as long as the second tarsomere ( pustulata : equally long); the gonostylar claw is broader and inserted on the broadly rounded gonostylar apex ( Fig. 129 , ↓ 1) ( pustulata : claw inserted on a short, flattened process); the gonocoxal synsclerite is more strongly narrowed towards the roundish base ( Fig. 128 , ↓ 2) ( pustulata : basal gonocoxal edge slightly convex to truncate); and the medial bridges of the gonocoxae are less strongly bulging towards the aedeagus ( Fig. 128 , ↓ 3). Females and preimaginal stages of W. pustulatula are unknown.

Discussion. Our material contains another unnamed Winnertzia from Sweden close to both W. pustulatula and W. pustulata , which is distinguished as follows. The single male (specimen CEC 3364 in NHRS) is very small (1.3 mm); the number of flagellomeres is 11; the fore tibia is much longer than the second tarsomere (tb/T 2 = 1.4–1.7); the empodia are vestigial; the gonostylus is less strongly swollen apically; the gonostylar claw is broader; and the processes at the apex of the aedeagal apodeme are appreciably smaller.

Etymology. The name, the diminutive of pustulata , refers to the general similarity of this species to the slightly larger W. pustulata .

Type material. Holotype. Male , Sweden, Öland , Borgholm, Lindreservat Nature Reserve, mixed broadleaf forest, 7 May–10 June 2015, Malaise trap, M. & C. Jaschhof (spn CEC 3072 in NHRS) . Paratypes. 5 males, same data as the holotype (spns CEC3073 – CEC 3074 in NHRS, CEC3075 – CEC 3077 in SDEI) .

Other material studied. Sweden: 1 male, Öland, Borgholm , Horns kungsgård NR, mixed forest of softwoods at lakeside, 6 May–11 June 2015, MT, MCJ (spn CEC 3079 in SDEI) ; 2 males, Öland, Mörbylånga, Ottenby , Södra lunden, mixed broadleaf forest, 27 May–7 June 2004, MT, SMTP (trap 21, collection event 991) (spns CEC3078 and CEC 3083 in NHRS) ; 1 male, Småland, Nybro, Alsterbro , Alsterån, mixed forest, 1–10 June 2006, MT, SMTP (trap 1008, collection event 1736) (spn GULI000020988 in NHRS) ; 1 male, Uppland, Håbo, Biskops-Arnö , elm grove, 20 May–20 June 2005, MT, SMTP (trap 8, collection event 1601) (spn CEC 3080 in NHRS) ; 1 male, Dalarna, Orsa , Oljonsbyn, Stenbergsvägen, backyard with rich flora including woody plants, 17 September 2016 – 18 June 2017, MT, MCJ & B. Oldhammer & K. Hedmark (spn CEC 3081 in SDEI) .

Distribution and phenology. Adults of W. pustulatula were collected in May–June in different woodlands in the southern half of Sweden (Småland to Dalarna).

Figures

FIGURES 128–134. Male morphology of Winnertzia pustulatula (128–131) and Winnertzia ruliki (132–134), holotypes. 128: Genitalia, ventral. 129: Gonostylus, ventral. 130: Fourth flagellomere, lateral. 131: Ditto, medial. 132: Genitalia, ventral. 133: Fourth flagellomere, lateral. 134: Ditto, medial. Scales for 128 and 130–134, 0.05 mm; for 129, 0.025 mm. Arrows refer to characters described in the diagnoses.