Dicerura barbata Mamaev 1966

Dicerura barbata Mamaev, 1966

Figs 9–12

Dicerura barbata was previously known only from the original material, referred to by Mamaev (1966) as consisting of four males (including the holotype) and a female, from two separate localities in Ukraine. The morphological description in the same publication takes no account of the female; rather it is stated there that females of this species were unknown. We identified a male from northern Sweden as conspecific with D. barbata based on the genitalic drawing provided with the original description (Mamaev 1966: fig. 6.3).

Diagnosis. The gonocoxites of D. barbata are quite unlike that of all other Dicerura in having an extremely

large emargination ventrally, which leaves just a short, asetose intercoxal bridge; the emargination is partly filled with an ovate, microtrichose lobe (Fig. 11, ↓1). The large, subtriangular gonocoxal processes are densely microtrichose medially; the dorsal apodemes are conspicuously long and thin (Fig. 11, ↓2). The elongate gonostylus

has a small side lobe subapicomedially, which is covered apically and dorsally with dense, large microtrichia, a few setulae, and 1–2 short bristles (Fig. 10, ↓3). The apical fork of the ejaculatory apodeme is perfectly V-shaped (Fig.

12). The elongate, parallel-sided tegmen, which is membranous for the most part, has a broadly rounded apex and a single pair of small, sclerotized processes subapicolaterally (Fig. 12, ↓4). The apex of the ninth tergite is bilobed

and densely covered with short, thick microtrichia, especially along the edge and on the inside (Fig. 9).

Remarks. The only specimen of D. barbata examined here is remarkable for the presence of a distinct,

complete M1+2, a vein usually regarded as vestigial in Dicerura. Mamaev (1966) did not mention this vein in his

description of D. barbata.

Material examined. Sweden: male, Lule Lappmark, Jokkmokk, Kaltisbäcken NR, herb-rich old-growth taiga

near stream, 10 July 2016, aspirator, M. Jaschhof (specimen no. CEC 1385 in NHRS).