Dicerura peterssoni, Jaschhof, Mathias & Jaschhof, Catrin, 2015

Jaschhof, Mathias & Jaschhof, Catrin, 2015, New species and new distribution records of Lestremiinae, Micromyinae and Porricondylinae (Diptera: Cecidomyiidae) in Sweden, Zootaxa 3973 (1), pp. 159-174 : 166-167

Dicerura peterssoni sp. n.

( Fig. 5 A–D)

Diagnosis. Dicerura peterssoni , a typical representative of the genus Dicerura , is most similar to Dicerura fungicola Mamaev ( Jaschhof & Jaschhof 2013: fig. 53) and distinguished from the latter as follows. The ventral surface of the gonocoxae is densely setose, but especially laterally not as densely as in D. fungicola (Fig. B); gonocoxal processes are slightly larger (Fig. B, ↓); the mediobasal lobe of gonostylus is longer (Fig. A, ↓); tegmen and ejaculatory apodeme are merged apically (Fig. D, ↓) (separate in D. fungicola ); the furca of ejaculatory apodeme is thicker and covered with tiny teeth (Fig. D, ↓) (without teeth in D. fungicola ); and the ninth tergite has the posterior margin slightly incised medially (Fig. C, ↓) (convex in D. fungicola ).

Other male characters. Body size 3.0– 3.1 mm. Head. Eye bridge 5–6 ommatidia long dorsally. Scape and pedicel lighter than flagellum. Neck of fourth flagellomere 1.7 times longer than node; circumfilum without posterior extensions. Palpus slightly longer than head height. Thorax. Both antepronotum and anepisternum setose. Wing. 3.1 times longer than wide. Vestige of M present at wing margin. Legs. Tarsi white-tipped. Terminalia ( Fig. 5 A–D). Ninth tergite: microtrichia on apical portion thick, but not coniform (Fig. C). Gonocoxae with wide asetose portion ventrobasally; ventral emargination subrectangular; 1 pair of processes (Fig. B, ↓). Gonostylus somewhat shorter than gonocoxa; apical portion bent ventrally, very densely setose, 1–2 short bristles dorsosubapically; mediobasal lobe densely pubescent apically (Fig. A–B). Membrane between gonostylus base and gonocoxa densely microtrichose. Tegmen almost parallel-sided, on apical half portion with many small barbs laterally (Fig. D). Base of ejaculatory apodeme obscure, apparently poorly sclerotized.

Etymology. This species is named after Nino Petersson, Kalmar, Småland.

Types. Holotype. Male (CEC71), Sweden, Dalarna, Rättvik, Gåsberget Nature Reserve 10 km N Dalfors, swamp forest, 19–20 Aug. 2005, sweepnet, M. Jaschhof (in NHRS). Paratype. Male (CEC72), Uppland, Östhammar, Andersby Nature Reserve SW Österbybruk, mixed deciduous / coniferous forest, 10 Sep. 2005, sweepnet & aspirator, M. Jaschhof.

Figures

FIGURE 5. Male genital structures of Dicerura peterssoni, ventral. A: Gonostylus. B: Genitalia. C: Apical portion of ninth tergite. D: Tegmen and ejaculatory apodeme. Scale 0.05 mm.