Ancistrocerus terekensis Kostylev, 1940

Fateryga, Alexander V., Proshchalykin, Maxim Yu. & Maharramov, Mahir M., 2025, New records of the eumenine wasps (Hymenoptera: Vespidae: Eumeninae) from Azerbaijan, with description of hitherto unknown male of Ancistrocerus terekensis Kostylev, 1940 and female of Eustenancistrocerus iranicus Gusenleitner, 2013, Zootaxa 5633 (1), pp. 110-122 : 112-113

Ancistrocerus terekensis Kostylev, 1940

( Fig. 1 )

Odynerus terekensis Kostylev, 1940: 25 , ♀ (type locality: “ St. Kazbek , Caucase Central ” [ Georgia]). Description of male (hitherto unknown). Body length (from head to apical margin of T2 ) 6.5 mm; forewing length 5 mm. Head about 1.2× as wide as long in frontal view. Clypeus about as wide as long, its apical emargination very shallow, taking 1/3 of clypeal width, apical teeth acutely rounded. Distance between lateral ocellus and occiput about 1.5× as both distance between lateral ocelli and distance between lateral ocellus and compound eye. F11 narrow and rather acute, reaching posterior margin of F8. Occipital carina complete. Width of gena in front of ocular sinus about 1.3× as width of compound eye at ocular sinus. Pronotal carina complete; antero-lateral angles of pronotum in dorsal view acutely rectangular. Scutum and scutellum slightly convex, scutellum with distinct longitudinal furrow. Epicnemial carina present but hidden between punctures. Metanotum with small dorsal surface forming rounded right angle with posterior vertical surface. Propodeal concavity separated by complete carinae forming rounded tooth laterally; dorsal surface of propodeum with rounded pit medially; median suture of propodeal concavity with complete carina. Propodeal valvula fused with projection of submarginal carina, rounded ventrally. Transverse carina separating anterior vertical part of T1 from posterior horizontal part with small notch medially; posterior horizontal part of T1 widening posteriorly, about 0.2× as long as apically wide. T 2 in dorsal view about 1.2× as wide as T1 apically; apical margin of T2 flat. Basal transverse furrow of S2 with longitudinal carinae longer medially than laterally. S2 posterior to basal transverse carina roundly elevated and then very slightly concave, without longitudinal furrow. S7 slightly and evenly convex, apically rounded. Genitalia as in Fig. 1D .

Clypeus shining, sparsely punctate, interspaces reaching several puncture diameters. Frons, vertex, and gena densely punctate, interspaces hardly reaching puncture diameter, rather dull, with indistinct microsculpture. Mesosoma, except tegula, posterior vertical surface of metanotum, metapleuron, and lateral surface of propodeum densely punctate, punctures slightly larger than those on frons, vertex, and gena, interspaces less than puncture diameter, dull, with reticulate microsculpture. Tegula shining, with scattered micropunctures. Posterior vertical surface of metanotum and propodeal concavity rather shining, with shallow indistinct macropunctures and reticulate microsculpture. Metapleuron and lateral surface of propodeum dull, with reticulate microsculpture and longitudinal wrinkles on upper parts. Anterior vertical part of T1 rather shining, with smoothened indistinct punctures. Posterior horizontal part of T1 and following terga sculptured finely than mesosoma, interspaces reaching several puncture diameters, with distinct reticulate microsculpture, punctures becoming finer towards apical margins of terga; T7 mostly with reticulate microsculpture, with only few indistinct punctures. Punctures on sterna, especially S2, coarser and sparser than those on corresponding terga, interspaces more shining but still with reticulate microsculpture. S7 with reticulate microsculpture only.

Mandible, frons, vertex, gena, and mesosoma covered mostly with long wavy setae at most as long as F1 (some setae on frons may be even longer). Labrum, clypeus, and metasoma with approximately two times shorter setae. All setae pale brown.

Basal color black. Following parts yellow: mandible except dark brown teeth, labrum, clypeus, central spot on frons, small bands on frons along inner margins of compound eyes, anterior surface of scapus, small spot on upper part of gena, anterior band on pronotum, apical bands on T1–T3 and S2, apical spots laterally on S3, legs from tops of femora to basitarsi. Ventral surface of F8–F9 and tops of tarsi ferruginous. Wings fuscous, particularly in marginal cell; veins dark brown, pterostigma brown.

Material examined. AZERBAIJAN. Nakhchivan Autonomous Republic : Shakhbuz, Zarnatun, 39°31′N, 45°46′E, 1550 m, 18. VI .2019, 1 ♂, leg. M. Proshchalykin, Kh. Aliyev, M. Maharramov [ CAFK] .

Distribution. Georgia, * Azerbaijan (Nakhchivan AR).

Remarks. This specimen was misidentified by Fateryga et al. (2021) as Ancistrocerus scoticus (Curtis, 1826) . The latter species should be excluded from the fauna of Azerbaijan. Ancistrocerus terekensis is very similar to A. nigricornis but the former species has a less developed yellow pattern of the body and antero-lateral angles of the pronotum bluntly rectangular in the female sex (not acutely rectangular as in A. nigricornis ). The male of A. terekensis is also very similar to A. nigricornis but has acutely rectangular antero-lateral angles of the pronotum ( Fig. 1A ) (not triangularly acute as in A. nigricornis ).

Figures

FIGURE 1. Ancistrocerus terekensis Kostylev, 1940, ♂. A, habitus in dorsal view; B, habitus in lateral view; C, head in frontal view; D, genitalia (left paramere and volsella in medial view, aedeagus in ventral view, and aedeagus in lateral view). Scale bars 1 mm.