Oelandyla rostrata, Jaschhof & Jaschhof, 2020

Jaschhof, Mathias & Jaschhof, Catrin, 2020, The Porricondylini (Diptera: Cecidomyiidae: Porricondylinae) of Sweden revisited: descriptions of nineteen new species of ten genera, including a new genus, Zootaxa 4728 (2), pp. 151-182 : 163-165

Oelandyla rostrata sp. nov.

Figs 19–22

Diagnosis. This is a small, delicate, mostly yellowish porricondyline with conspicuously long-necked flagellomeres ( Fig. 20 ) and long, narrow wings ( Fig. 22 ). Structures specific to O. rostrata are the gonostylus, whose strongly convex basal portion supports a long, beak-shaped process with a large apical tooth, and the parameres, which are present as a reversely V-shaped pair of slender, sclerotized rods with flattened apices ( Fig. 21 , ↓ 1, 2).

Other male characters. Body size 1.3 mm. Head. Postcranial setae sparse. Eye bridge 1 ommatidium long at vertex. Postfrons non-setose. Scape and pedicel nearly concolorous with flagellum. Circumfila on flagellomeres 1–7, evenly ring-shaped or slightly sinuous ( Fig. 20 ). Neck of fourth flagellomere 1.8 times as long as node ( Fig. 20 ). Palpus slightly shorter than head height, consisting of a weak, non-setose palpiger and 4 setose, subcylindrical segments, apical segment longest of all. Thorax. Scutum with 3 brown stripes (1 dorsal and 2 dorsolateral); no light windows; setae sparse. Scutellum conspicuously bright. Pronotum sparsely setose; anepisternum non-setose; anepimeron with 2 setae. Wing ( Fig. 22 ). Length / width ratio 3.8. Proximal half portion of membrane devoid of setae. M 1+2 absent; M 4 indicated as a short, diffuse line. Legs. Foreleg: femur and tibia same length, tibia 1.4 times as long as T 2. Claws crescent-shaped, toothless. Empodia 2/3 as long as claws. Abdomen. Sclerites faintly contrasting with surrounding membrane, sparsely setose. Genitalia ( Fig. 21 ). Ninth tergite subtrapezoid, with long, sparse setae. Gonocoxal synsclerite sparsely setose ventrally, a narrow, non-setose portion ventroanteriorly; ventral emargination broadly U-shaped, unsclerotized basally; medial bridges projecting; dorsoposterior portions extended into rounded, setose lobes; dorsal apodemes short. Gonostylar setae large; apical tooth apparently solid. Aedeagal apodeme slightly longer than parameres, with angular, membranous extension apically. Hypoproct (not illustrated) only slightly smaller than cerci; bilobed apically, each lobe with 1 apical seta. Cerci (not illustrated) largely merged into a single sclerite, with 4 setae on either side near the apex, posterior edge shallowly emarginated.

Etymology. The Latin adjective rostrata means ̒with a beak’, referring to the structure of the gonostylus.

Type material. Holotype. Male , Sweden, Öland , Borgholm, Rönnerum-Abbantorp Nature Reserve, small

bushy mire surrounded by broadleaf forest, 17 June–15 July 2015, Malaise trap, M. & C. Jaschhof (spn. CEC 2552 in NHRS).

Figures

FIGURES 19–24. Male morphology of Oelandyla rostrata (19–22) and Parepidosis kaltisbackensis (23–24), holotypes. 19: Basitarsus of foreleg, lateral. 20: Fourth flagellomere, lateral. 21: Genitalia, ventral. 22: Wing, dorsal. 23: Genitalia, ventral. 24: Fourth flagellomere, lateral. Scales for 19–21 and 23–24, 0.05 mm; for 22, 0.50 mm. Arrows refer to characters described in the diagnoses.