Winnertzia longicoxa, 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 : 63-65

Winnertzia longicoxa sp. nov.

Figs 116–118

Diagnosis. This medium-sized, brown Winnertzia is another species separated here from W. tridens , based on stable differences in the morphology of males (females and preimaginal stages remain unidentified). A peculiarity of W. longicoxa is that the dorsoposterior portions of the gonocoxae are elongated into large, subtriangular lobes whose apex almost reaches the posterior gonostylar edge ( Fig. 116 , ↓ 5). In W. tridens , and species closely related to it, those lobes are considerably smaller and rounded rather than pointed. Within the W. tridens complex W. longicoxa is also distinguished by the straight, comparatively short gonostylus with a subbasal constriction and narrow, fairly long pectinate claw (↓ 6).

Other male characters. Body size 1.8–1.9 mm. Head. Eye bridge 3–4 ommatidia long dorsally. Antenna two thirds 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 0.9 times as long as node; node 1.7 times as long as broad; sensory hairs numerous; translucent sensilla filiform, lateral sensillum obliquely to transversely aligned, occasionally U-shaped ( Fig. 117 ), medial sensillum longitudinally aligned ( Fig. 118 ). Palpus slightly longer than head height, 4 setae-bearing segments; apical segment longest of all. Labella fully developed. Thorax. Pronotal setae 14–19. Anepimeral setae absent. Lateral mediotergal microtrichia large. Parascutellar area bright, vaguely contoured. Wing slightly shorter 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 pointed scales. Basitarsal spines absent. Fore tibia and T 2 equally long. Acropods: claws slightly bent, basal tooth large; empodia vestigial. Abdomen. Pleural membrane setose. Genitalia ( Fig. 116 ). Ninth tergite considerably shorter than gonocoxae; setae largely confined to posterior and lateral portions; anterior edge distinct; posterior edge broadly rounded. Gonocoxal synsclerite broader than long; ventral emargination broadly U-shaped, sclerotized basally; ventroanterior edge distinct, straight; dorsal apodemes long and thin. Gonostylus twice as long as broad; basolateral apophysis fairly large, very slightly angulated. Aedeagal apodeme: recurved apical processes large; solid basal portion long. Tegmen faintly contoured; flaps small, indistinct; parameral apodemes long, directed ventrolaterad.

Etymology. The name, a noun in apposition, refers to the gonocoxae of this species whose outline is charcterized by unusually large posterior extensions.

Type material. Holotype. Male , Sweden, Öland , Mörbylånga , Stora Dalby lund Nature Reserve, mixed broadleaf forest with plenty of dead ash trees, 8 June–8 July 2015, Malaise trap, M. & C. Jaschhof (spn CEC 3173 in NHRS) . Paratypes. 3 males, same data as the holotype (spns CEC3174 – CEC 3175 in NHRS, CEC 3176 in SDEI) ; 1 male, same data but 9 July–8 August 2015 (spn CEC 3177 in SDEI) ; 1 male, Öland, Mörbylånga, Gamla Skogsby (Kalkstad), mixed broadleaf forest with plenty of dead ash, 5 July–4 August 2016, MT, MCJ & E. Gustavsson (spn CEC 3178 in SDEI) .

Distribution and phenology. Our specimens were collected in June–August in two broadleaf forests containing large amounts of dead ash wood, both located on the island of Öland.

Figures

FIGURES 112–118. Male morphology of Winnertzia lapponica (112–115) and Winnertzia longicoxa (116–118). 112: Posterior portion of thorax, lateral, paratype. 113: Genitalia, ventral, holotype. 114: Fourth flagellomere, lateral, paratype. 115: Ditto, medial. 116: Genitalia, ventral, holotype. 117: Fourth flagellomere, lateral, paratype. 118: Ditto, medial. Scales for 112, 0.025 mm; for 113–118, 0.05 mm. Arrows refer to characters described in the diagnoses.