Winnertzia grytsjoenensis, 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 : 28-30

Winnertzia grytsjoenensis sp. nov.

Figs 48–50

Diagnosis. A small, brown Winnertzia with broad wings devoid of vein M 4. The gonostylar claw is broader than in most other species of the setosa group ( Fig. 50 , ↓ 1); the aedeagal apodeme is markedly broadened beyond the solid basal portion (↓ 2) and slightly broadened subapically (↓ 3); and the posterior edge of the ninth tergite is straight. Females and preimaginal stages of W. grytsjoenensis are unknown.

Other male characters. Body size 1.3 mm. Head. Eye bridge 3–4 ommatidia long dorsally. Antenna longer than half body. Scape and pedicel same size, both concolorous with flagellum. 11 flagellomeres, translucent sensilla present on flagellomeres 1–8. Fourth flagellomere: neck 0.6 times as long as node; node 1.6 times as long as broad; sensory hairs numerous; translucent sensilla filiform, variously slightly bent, lateral sensillum short, transversely aligned ( Fig. 48 ), medial sensillum long, longitudinally aligned ( Fig. 49 ). Palpus nearly as long as head height, 4 setae-bearing segments; apical segment longest of all. Labella fully developed, albeit small. Thorax. Pronotal setae 9. Anepimeral setae absent. Lateral mediotergal microtrichia large. Parascutellar area bright, sharply contoured. Wing nearly as long as body, 2.4 times as long as broad. Costal cell reinforced. CuA gently bent, extending to edge of wing. Legs. Scales pointed. Basitarsal spines absent. Fore tibia 1.4 times length T 2. Acropods: claws bent, basal tooth large; empodia 0.8 claw length. Abdomen. Pleural membrane setose. Genitalia ( Fig. 50 ). Ninth tergite shorter than half gonopodal length; setae confined to posterior portion; anterior edge indistinct. Gonocoxal synsclerite broader than long; setae near base of emargination conspicuously large; a small ventrobasal portion non-setose; ventrobasal edge straight; ventral emargination U-shaped, membranous basally; ventro- and dorsoposterior portions ending at same level; dorsal apodemes short, thin. Gonostylus more than twice as long as broad, slightly constricted before midlength; basolateral apophysis small, angulated. Aedeagal bulge apparently without spikes. Tegmen largely membranous, vaguely contoured except for basal half which is more sharply outlined, gently tapered towards rounded apex; flaps indistinct, without microtrichia; parameral apodemes small.

Etymology. The name refers to Grytsjön Nature Reserve in Småland, which is the type locality of this new species.

Type material. Holotype. Male , Sweden, Småland , Nybro , Bäckebo , Grytsjön Nature Reserve, old-growth hemiboreal forest of conifers mixed with aspen trees, 2–12 July 2005, Malaise trap, Swedish Malaise Trap Project (trap 1000, collection event 1323) (spn CEC 1879 in NHRS).

Other material studied. Sweden: 1 male (only genitalia mounted on slide), same data as the holotype but 17 July–11 August 2014, MCJ (spn ZFMK-TIS- 2549572 in NHRS) .

Distribution and phenology. This species is known from a single locality in Småland, where two specimens were collected at the height of summer (but at an interval of almost a decade) in the old-growth hemiboreal forest prevailing there.

Figures

FIGURES 48–53. Male morphology of Winnertzia grytsjoenensis (48–50) and Winnertzia normalis (51–53). 48: Fourth flagellomere, lateral, holotype. 49: Ditto, medial. 50: Genitalia, ventral, holotype. 51: Ditto. 52: Fourth flagellomere, lateral, paratype. 53: Ditto, medial. Scales 0.05 mm. Arrows refer to characters described in the diagnoses.