Desertepidosis grytsjoenensis, Jaschhof & Jaschhof, 2019

Jaschhof, Mathias & Jaschhof, Catrin, 2019, New Dicerurini from Europe, mostly Sweden (Diptera: Cecidomyiidae, Porricondylinae), Zootaxa 4559 (2), pp. 245-264 : 248-249

Desertepidosis grytsjoenensis sp. nov.

Fig. 1

Diagnosis. A typical member of the genus Desertepidosis , this new species is distinguished by a combination of several characters, as follows. A wide, dorsal section of the eye bridge has no ommatidia; flagellomeres number 14; neck and node of the fourth flagellomere are equally long; the palpus is 4-segmented ( Jaschhof & Jaschhof 2013: fig. 48F, as D. borealis ); the costal break is situated before the apex of the wing; the claws have a single large tooth basally; and the empodia are slightly shorter than the claws. As for genitalic characters ( Fig. 1 ), the posterior edge of the ninth tergite is sinuous, with the convex sections accentuated by dense microtrichia (↓ 1); the gonostylus, whose basolateral apophysis is well developed, is markedly bent and slightly tapered towards the apex (↓ 2); of the gonocoxae, the setae bordering the ventral emargination are sparse or absent medially, the ventral bridge is about as long as the emargination, the dorsoposterior portions protrude only slightly beyond the ventroposterior edge (↓ 3), and the anterior processes of the dorsal apodemes are conjoined through a diffuse, plate-like bridge (↓ 4); the tegmen is only slightly longer than the medial gonocoxal bridge; and the ejaculatory apodeme is a thin, weakly sclerotized rod with unmodified apex and base.

Etymology. The species epithet refers to Grytsjön, a nature reserve protecting a remnant of unspoiled hemiboreal forest in Sweden’s province Småland, which our research showed to be extraordinarily rich in fungusfeeding cecidomyiids. Also, Grytsjön Nature Reserve is the only location, in Sweden and elsewhere, where three different species of Desertepidosis are known to occur.

Type material. Holotype. Male , Sweden, Småland , Bäckebo , Grytsjön Nature Reserve, old-growth aspen forest, 27 June–2 July 2005, Malaise trap, Swedish Malaise Trap Project (trap 1000, collecting event 1322) (spm. SE 877 in NHRS). This specimen was previously labeled a paratype of D. borealis . Paratypes. 1 male, same data as the holotype but 2–12 July 2005 (collecting event 1323) (spm. CEC 1592 in NHRS) ; 1 male, same locality, mixed forest of aspen, spruce and pine, 17 June–16 July 2015, MT, MCJ (spm. CEC 1593 in SDEI) .

Figures

FIGURES 1–4. Desertepidosis grytsjoenensis, male, holotype. 1: Genitalia, ventral. Desertepidosis robusta, males. 2: Genitalia, ventral, holotype. 3: Base of ejaculatory apodeme, ventral, paratype. 4: Apex of wing, dorsal, holotype. Scales for 1– 3, 0.05 mm, for 4, 0.25 mm. Arrows refer to characters described in the diagnosis.