Winnertzia sundini, 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 : 55

Winnertzia sundini sp. nov.

Figs 97–99

Diagnosis. With a male body size of 1.3 mm, this light-brown species is one of the smallest Winnertzia known to us. In males (females and preimaginal stages are unknown) the eye bridge is 0–1 ommatidium long dorsally; the short palpus has usually 3, rarely 4 setose segments of varying shape; the wing is conspicuously narrow (length / width ratio 2.6), with the membrane lacking setae on the proximal half; and the empodia are vestigial. Genitalic characters of diagnostic merit are as follows ( Fig. 97 ). The gonostylus, which is appreciably broader distally than basally, has a conspicuously small claw apically (↓ 4); the apex of the aedeagal apodeme is constricted (↓ 5); the ventral portions of the gonocoxal synsclerite are sparsely setose on the posterior two thirds and devoid of setae on the anterior third; and the short ninth tergite has a sinuous posterior edge (↓ 6).

Other male characters. Head. Antenna two thirds as long as body. Scape and pedicel same size, both concolorous with flagellum. 11 flagellomeres, flagellomeres 1–7(–8) with translucent sensilla. Fourth flagellomere: neck 0.8–0.9 times as long as node; node 1.6 times as long as broad; sensory hairs fairly sparse; both lateral and medial translucent sensilla small, varying in shape ( Figs 98–99 ). Labella fully developed, albeit small. Thorax. Pronotal setae 0–3. Anepimeral setae absent. Lateral mediotergal microtrichia large. Parascutellar area bright, sharply contoured. Wing as long as body. Costal cell reinforced. M 4 long, almost straight, CuA gently bent apically, both veins extending to edge of wing. Legs with pointed scales. Basitarsal spines absent. Fore tibia 1.6–1.7 times as long as T 2. Claws slightly bent, basal tooth large. Abdomen. Pleural membrane devoid of setae. Genitalia ( Fig. 97 ). Ninth tergite slightly longer than half gonopodal length; setae confined to posterior portion; anterior edge straight, distinct. Gonocoxal synsclerite slightly broader than long; markedly narrowed basally; ventral emargination V-shaped, accompanied by extensive unsclerotized area basally; ventroanterior edge distinct, convex; ventro- and dorsoposterior portions ending at same level; dorsal apodemes long and thin. Gonostylus about twice as long as broad, straight; basolateral apophysis fairly large, slightly angulated. Aedeagal apodeme for most of its length parallel-sided; solid basal portion moderately long. Microtrichia on aedeagal bulge barely visible. Tegmen slightly tapered towards broadly rounded apex, sharply contoured; flaps large, distinct; parameral apodemes moderately large.

Etymology. This species is named after Rickard Sundin Jooste, based in Huddinge, Sweden. Herewith we honor Dr Sundins’s outstanding contribution to biodiversity research in his capacity as the former Research Officer of the Swedish Taxonomy Initiative. See also the dedication at the end of this paper.

Type material. Holotype. Male , Sweden, Småland , Nybro , Bäckebo , Grytsjön Nature Reserve, old-growth, thin forest of aspen trees, 27 June–2 July 2005, Malaise trap, Swedish Malaise Trap Project (trap 1000, collection event 1322) (spn CEC 3002 in NHRS).

Other material studied. Sweden: 3 males, Södermanland, Huddinge, Sofielund Recycling Center, pine grove at edge of garbage dump, 10–16 August 2004, MT, SMTP (trap 5, collection event 767) (spns CEC3003 – CEC 3004 in NHRS, spn CEC 3005 in SDEI) ; 1 male, Uppland, Ekdalen NR, sparse woodland of oak, 13–27 June 2005, MT, SMTP (trap 27, collection event 1702) (spn CEC 3006 in SDEI) .

Distribution and phenology. All the five specimens known of this species were collected in summer (June– August) in different woodlands in the southern half of Sweden (Småland, Södermanland, Uppland).

Figures

FIGURES 94–99. Male morphology of Winnertzia smalandensis (94–96) and Winnertzia sundini (97–99), holotypes. 94: Fourth flagellomere, lateral. 95: Ditto, medial. 96: Genitalia, ventral. 97: Ditto. 98: Fourth flagellomere, lateral. 99: Ditto, medial. Scales 0.05 mm. Arrows refer to characters described in the diagnoses.