Dicerura yezoensis Jaschhof & Spungis, 2018

Jaschhof, Mathias & Spungis, Voldemars, 2018, Towards reliable identification of male Dicerura: descriptions of three new and seven poorly known species in the Palearctic region (Diptera: Cecidomyiidae, Porricondylinae), Zootaxa 4422 (1), pp. 85-103 : 90-91

Dicerura yezoensis Jaschhof & Spungis sp. nov.

Figs 6–8

Diagnosis. Dicerura yezoensis , a member of the formosa group, is distinguished as follows: the gonostylus has a broadly rounded, not pointed, apex ( Fig. 6 , ↓1); the ventromedial gonocoxal processes are big and subglobular rather than ovate ( Fig. 6 , ↓2); and the posterior edge of the ninth tergite is provided with a pair of pointed, microtrichose lobes ( Fig. 7 , ↓3).

Other male characters. Body length 3.3 mm. Head. Eye bridge 3–4 ommatidia long dorsally. Antenna clearly

shorter than body; scape and pedicel yellowish, lighter than flagellum. Circumfila with 1, seldom 2 short

extensions. Neck of fourth flagellomere slightly shorter than node. Palpus 4-segmented, 0.7 times the head height.

Thorax. Scutum with dark stripes dorsally and laterally. Anepisternum with 10 setae. Wing as long as body, with

brownish tinge. Veins thick, distinct; Rs long, ¼ the length of R1, r-m slightly longer than Rs, apical portion of M1+2

distinct, basal portion vanished. Legs. Empodia rudimentary. Claws slightly bent, 4 basal teeth gradually

decreasing in size. Genitalia. Ninth tergite subtrapezoid, with setae of various lengths except along median;

anterior edge straight, faintly contoured ( Fig. 7 ). Gonocoxites: ventral surface densely setose; ventral emargination broadly rounded, sclerotized basally; dorsolateral processes larger than ventromedial processes, both with fine setae; dorsal portions angular-shaped posteriorly; dorsal apodemes moderately long ( Fig. 6 ). Gonostylus twice longer than broad, slightly bent, slightly tapered towards apex, large setae laterally, both small setae and dense, short microtrichia medially ( Fig. 6 ). Tegminal apex with collar of 5 inconspicuous knobs ( Fig. 8 ).

Etymology. The species epithet is derived from Yezo, a now historical name of Hokkaido, where the holotype of this species was collected.

Type material. Holotype. Male, Japan, Hokkaido, Tomakomai, Hokkaido University Experimental Forest , mixed broadleaf deciduous forest, 30 June–26 July 1999, Malaisetrap, M. & C. Jaschhof (in KUEC) .

Figures

FIGURES 6–8. Dicerura yezoenSiS, male, holotype. 6: Genitalia, ventral. 7: Ninth tergite, dorsal. 8: Tegmen (apex slightly distorted) and ejaculatory apodeme, ventral. Scales 0.05 mm. Arrows refer to characters described in the diagnosis.