Winnertzia oelandica, 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 : 30-32

Winnertzia oelandica sp. nov.

Figs 54–57

Diagnosis. A medium-sized, brown Winnertzia with short antennae and with basitarsal spines ( Fig. 57 ). The gonostylus is slightly constricted before the midlength and then markedly convex medially ( Fig. 56 , ↓ 1); the gonocoxal apodemes are peculiar for their short-subtriangular shape (↓ 2); and the posterior edge of the ninth tergite is deeply emarginate. Females and preimaginal stages of W. oelandica are unknown.

Winnertzia oelandica resembles W. italiana in having toothless claws, vestigial empodia, and long wings. Also, the basitarsi of W. italiana were described to have spines, corresponding to the condition in W. oelandica , but this remains to be checked against the holotype. Obvious differences between the two species are the flagellomeral nodes, which are more than twice as long as broad in W. oelandica compared to 1.5 times in W. italiana , and the ninth tergite, whose posterior margin is deeply emarginate in W. oelandica but straight in W. italiana .

Other male characters. Body size 1.5–1.7 mm. Head. Eye bridge 2–3 ommatidia long dorsally. Antenna shorter than half body. Scape and pedicel same size, both concolorous with flagellum. 10 flagellomeres, translucent sensilla present on flagellomeres 1–9. Fourth flagellomere: neck 0.5 times as long as node; node 2.2 times as long as broad; sensory hairs sparse; both lateral and medial translucent sensilla long, filiform, longitudinally aligned, variously slightly bent ( Figs 54–55 ). Palpus shorter than head height, 3 setae-bearing segments, preceded by two small, non-setose bodies which presumably are palpifer and first segment; apical segment as long as preceding two segments together. Labella fully developed, albeit small. Thorax. Pronotal setae 6–7. Anepimeral setae absent. Lateral mediotergal microtrichia large. Parascutellar area bright, sharply contoured. Wing as long as body, 2.6 times as long as broad. Costal cell reinforced. M 4 faint, barely discernible. CuA gently bent, fading before wing edge.

Legs. Scales pointed. Fore tibia 1.1 times length T 2. Claws slightly bent. Abdomen. Pleural membrane devoid of setae. Genitalia ( Fig. 56 ). Ninth tergite shorter than half gonopodal length; setae confined to posterior half portion; anterior edge indistinct. Gonocoxal synsclerite broader than long; setae close to base of emargination conspicuously large; ventroanterior edge straight; ventral emargination U-shaped, membranous basally; ventro- and dorsoposterior portions ending at same level. Gonostylus 2.7 times as long as broad; basolateral apophysis small, angulated. Aedeagal apodeme parallel-sided; solid basal portion short. Aedeagal bulge with closely spaced rows of tiny spikes; anterior edge well-marked as transverse line. Tegmen largely membranous, vaguely contoured except for basal half which is more sharply outlined; distal third subtriangular; apex narrowly rounded; flaps faintly contoured, without microtrichia; parameral apodemes small.

Etymology. The name is derived from Öland, the provenance of all the specimens known of this species.

Type material. Holotype. Male , Sweden, Öland , Mörbylånga, Kalkstad Nature Reserve, mixed broadleaf forest, 27 June–30 July 2014, Malaise trap, M. & C. Jaschhof (spn CEC 1876 in NHRS) . Paratypes. 1 male, Öland, Mörbylånga, Vickleby ädellövskog NR, mixed broadleaf forest with plenty of dead ash trees, 17 June–14 July 2015, MT, MCJ (spn CEC 1878 in NHRS) ; 1 male, Öland, Borgholm, Rönnerum-Abbantorp NR, mixed broadleaf forest predominated by hornbeam, 17 June–15 July 2015, MT, MCJ (spn CEC 1877 in SDEI) .

Other material studied. Sweden: 2 males (only genitalia mounted on slide), Öland , Mörbylånga, Gamla Skogsby (Kalkstad), mixed broadleaf forest, 27 June–30 July 2014, MT, MCJ (spns ZFMK-TIS-2549544–ZFMK-TIS- 2549545 in NHRS) .

Distribution and phenology. Winnertzia oelandica is known only from Öland. The five specimens at our disposal were collected in summer in four different localities, all covered with broadleaf forest.

Figures

FIGURES 54–62. Male morphology of Winnertzia oelandica (54–57) and Winnertzia setosa (58–62). 54: Fourth flagellomere, lateral, paratype. 55: Ditto, medial. 56: Genitalia, ventral, holotype. 57: Basitarsus of foreleg, lateral, holotype. 58: Posterior portion of ninth tergite, dorsal, holotype. 59: Genitalia, ventral, holotype. 60: Fourth flagellomere, lateral, holotype. 61: Ditto, medial. 62: Dorsal gonocoxal bridge, ventral, paratype. Scales for 54–57 and 59–61, 0.05 mm; for 58 and 62, 0.025 mm.Arrows refer to characters described in the diagnoses.