Dicerura unidentata Spungis 1987

Dicerura unidentata Spungis, 1987

Figs 28–31

Spungis (1987) based his description of D. unidentata on three larvae found in Latvia, of which one developed into

a male adult. Subsequent records of males of this species are from Finland (Jaschhof et al. 2014) and, as shown

here, from Estonia, Slovakia, and Ukraine. The female of D. unidentata remains unknown.

Diagnosis. Dicerura unidentata is a typical member of the dentata group. Characteristic of the gonocoxites,

the ventral emargination is angular-shaped and bordered by small, inconspicuous protuberances with both setulae and large microtrichia (Fig. 28, ↓1); around the emargination is a darkly pigmented area. The subrectangular

tegmen is 2.5 times longer than broad and provided with 4–6 small barbs of various sizes apicolaterally (Fig. 31, ↓2). The additional, single barb present at the tegminal apex (therefore the species’s name, unidentata) is in most of the specimens studied here reduced to a roundish, sclerotized knob (Fig. 31, ↓3), in other specimens it is

untraceable. The subtriangular gonostylus is about 1.5 times longer than broad; the mediobasal lobe is somewhat

angular and provided with 5–15 short bristles among sparse, large microtrichia (Fig. 30). The apical fork of the

ejaculatory apodeme takes up more than one third of the apodeme’s total length (Fig. 31). The apex of the ninth tergite, which is broadly rounded to truncate, is covered with dense, thick microtrichia (Fig. 29, ↓4). Species with

similar genitalia are D. dentata and D. dispersa. In distinction from D. unidentata, the tegmen of D. dentata is provided with more and slightly larger barbs that together form a saw-blade structure on either side (Jaschhof & Jaschhof 2013: fig. 50E), while the tegmen of D. dispersa is constricted subapically, not parallel-sided (Jaschhof & Jaschhof 2013: fig. 51C).

Remark. Unlike stated by Spungis (1987), and in accordance with most Dicerura, the palpus of D. unidentata has four segments.

Material examined. Finland: 9 males, Lapponia enontekiensis, Kilpisjärvi, SW slope of Saana, 15–30 June 2006, MT, J. Penttinen (in MZH). Estonia: male, Ida-Virumaa, Mäetaguse, 1–13 June 2011, MT, H. Aia & EMTP (in IZBE). Slovakia: 2 males, Muránská planina NP, Muránská Lehota, 12 April–24 May 2012, MT, J. Roháček & J. Ševčik (specimens nos A7772–A 7773 in SDEI). Ukraine: 3 males, Crimea, Crimean Mountains NR, Mount Babugan, 6 June 1986, sweepnet, Z. L. Berest (in IBUL).