Andrena (Poecilandrena) adjacens Morawitz, 1875

Wood, Thomas James, 2023, New Old World Andrena species, with a focus on Turkey (Hymenoptera: Andrenidae), Zootaxa 5266 (1), pp. 1-72 : 59-61

Andrena (Poecilandrena) adjacens Morawitz, 1875

Description: Male: Body length: 8 mm ( Figure 35A ). Head: Dark, 1.2 times wider than long ( Figure 35B ). Clypeus entirely yellow marked with exception of two small black marks medio-laterally, yellow markings extending onto lower paraocular areas, extending dorsally as far as lower margin of antennal insertions. Clypeus domed, shallowly punctate, punctures separated by 1–3 puncture diameters, underling surface superficially shagreened, weakly shining. Process of labrum trapezoidal, twice as wide as long, apical margin very weakly emarginate. Gena equalling width of compound eye, ocelloccipital distance equalling two thirds diameter of lateral ocellus. Face, gena, vertex, and scape with long white hairs, becoming slightly yellowish-brown on vertex; longest hairs on lower part of gena exceeding length of scape. Antennae basally dark, A4 apically, A5–13 ventrally lightened orange; A3 slightly exceeding A4+5, shorter than A4+5+6. Mesosoma: Scutum and scutellum clearly punctate, punctures separated by 1–2 puncture diameters, underlying surface weakly shagreened apically and laterally, becoming smooth and shining medially ( Figure 35C ). Mesepisternum and dorsolateral parts of propodeum microreticulate with short and obscurely raised rugosity; propodeal triangle clearly delineated laterally by raised carinae, internal surface with dense network of raised rugae covering entire surface. Mesepisternum with long white hairs exceeding length of scape, scutum and scutellum with shorter yellowish-brown hairs, propodeum with sparser and shorter whitish plumose hairs. Legs dark, fore and mid basitarsi obscurely and partially lightened orange, predominantly dark, hind basitarsi entirely orange; pubescence whitish. Hind tarsal claws with strong inner tooth. Wings hyaline, stigma and venation dark orange, nervulus interstitial. Metasoma: Terga extensively red-marked; T1 apico-laterally on disc and marginal area, T2–4 entirely, T5 laterally on disc; remaining areas dark ( Figure 35D ). Tergal discs regularly punctate, punctures separated by 1–2 puncture diameters, marginal areas slightly depressed, with obscure sparse punctures, becoming impunctate apically, underlying surface finely shagreened, weakly shining. T1 with moderately long whitish upstanding hairs, remaining terga with short obscure whitish hairs. S8 long and columnar, apically slightly truncate, ventrally with short golden hairs. Genital capsule large, gonocoxae without apical teeth, gonostyli apically converging, produced into narrow apically projecting pegs ( Figure 35E ). Penis valves very broad, occupying entire space between gonostyli, with clear valve opening medially, slightly bulbous in profile view ( Figure 35F ).

Diagnosis: Andrena adjacens can quickly be recognised as a Poecilandrena due to its small body size, extensive red colouration of the terga ( Figure 35D ), white facial markings on the clypeus and lower paraocular areas ( Figure 35B ), and typical construction of the genital capsule ( Figures 35E–F ). The specific construction of the genital capsule does not match any known Poecilandrena. It is most similar to A. labiata ( Figure 35G ) and A. hybrida ( Figure 35H ). The penis valves are much broader, occupying the entire area between the gonostyli ( Figure 35E ; with clear space visible in the two comparison taxa), and the gonostyli are weakly apically produced, thickened, and not outwardly reflexed (gonostyli apically produced into long and tapering points in A. hybrida , points shorter in A. labiata but clearly outwardly reflexed at their apexes). Andrena adjacens was described from Alexandropol [Gyumri] in northern Armenia. The two collecting localities of Erzincan and Erzurum are approximately 375 km and 230 km to the west, respectively, but these are areas with a similar climate. An Turko-Armenian fauna can be found in north-eastern Turkey, as supported by the discovered of A. (Leimelissa) ermolenkoi Osytshnjuk, 1984 in this region (see below). The female type of A. adjacens is illustrated by Astafurova et al. (2021).

Distribution: Turkey and Armenia ( Astafurova et al. 2021).

Material examined: TURKEY: 14 km N Erzincan, road Erzincan to Çayırlı , st. 466, 2000 m, 10.vi.1988, 1♁, leg. H. & Th. v. Oorschot, H. v. d. Brink, H. Wiering, RMNH ; Erzurum, 17.vi.1971, 1♁, leg. H. Ozbek, OÖLM .

Figures

FIGURE 35.Andrena (Poecilandrena) adjacensMorawitz,1875 male.A.Habitus,lateral view, B.Face, frontal view,C.Scutum, dorsal view, D. Terga, dorsal view, E. Genital capsule, dorsal view, F. Genital capsule, lateral view. Andrena (Poecilandrena) labiata Fabricius, 1781 male. G. Genital capsule, dorsal view. Andrena (Poecilandrena) hybrida Warncke, 1975 male. H. Genital capsule, dorsal view.