Euboeus (Pelorinus) arzanovi, Nabozhenko, 2022

Nabozhenko, Maxim V., 2022, A taxonomic review of the genus Euboeus Boieldieu, 1865 (Coleoptera: Tenebrionidae: Helopini) of the Caucasus, Iran and Turkmenistan, Zootaxa 5159 (4), pp. 451-486 : 461-463

Euboeus (Pelorinus) arzanovi sp. nov.

( Fig. 8 )

Type material. Holotype, ♂ and paratype, ♂ ( HNHM): Iran, Gachsar [Alborz Prov.]— Marzanabad [Mazandaran Prov.], 1700–2500 m, 28.iv.1970 (leg. Wittmer, v. Bothmer).

Description. Male. Body slender, elongate, black, with dull shine ( Fig. 8A ). Measurements: Y = 1.47; PH w = 1.44; P w P l = 1.09; E l E w = 1.74; EH w = 1.94; EP w = 1.34; EP l = 2.6–2.61. Body length 12.5–13 mm, width 4.5–4.8 mm.

Head ( Figs 8B, E, F ). Anterior margin of epistoma straight ( Fig. 8E ). Head widest at eye level. Eyes moderately convex, circumocular impression narrow. Lateral margins of genae angularly rounded. Puncturation of head moderately fine and sparse on frons (interpuncture distance near 3 times as long as puncture diameter) and denser on epistoma and genae (interpuncture distance subequal to or near 1.5 times as long as puncture diameter). Ventral side of epicranium coarsely and densely punctured; temples depressed behind eyes in the lower half ( Fig. 8B ). Antennae comparatively long, with four apical antennomeres, extending beyond base of pronotum, reaching 1/3 of elytral length.

Prothorax ( Figs 8B, E–G ). Pronotum weakly transverse, with almost equal length and width, widest at middle ( Fig. 8E ). Lateral margins of pronotum weakly rounded in middle part, straightly narrowed in apical third and widely emarginated in basal quarter; anterior margin trisinuate; base slightly rounded, almost straight, with emargination at middle. Antero-lateral corners not projected, right, pointed at apex; postero-lateral corners right, narrowly rounded at apex. Lateral margins not beaded; anterior margin only with very short bead marginally; disc completely beaded. Disc of pronotum convex, not flattened along lateral margin, without impressions. Puncturation of disc fine and sparse (puncture diameter 2–4 times as short as interpuncture distance), slightly coarser and denser on lateral sides; punctures round ( Figs 8E, F ). Prosternum with fine and sparse simple puncturation ( Fig. 8B ). Outer margin of prothoracic hypomera narrowly flattened only near base. Prohypomera with small confused microwrinkles with poorly distinguished sparse smoothed puncturation against their background ( Fig. 8G ). Prosternal process smooth and shiny (only rugose near apex), almost without punctures, slightly convex at apex, not beaded ( Figs 8B, G ).

Pterothorax ( Figs 8A, B ). Scutellar shield triangle, moderately coarsely punctured. Elytra strongly elongate, widest slightly behind middle; punctures in striae fine, round, widely spaced; punctures in interstriae fine and sparse, much smaller than strial ones ( Fig. 8A ). Anterior half of mesoventrite strongly wrinkled, pubescent, with more smooth middle ( Fig. 8B ). Mesepisterna coarsely and densely punctured by large foveae; puncturation of mesepimera and metepisterna sparser and finer; metaventrite coarsely and moderately sparsely punctured and pubescent with short setae.

Legs ( Figs 8B, G ). Trochanters with short dense reddish setae (but not dense brush), protrochanters with two long setae ( Fig. 8G ), meso- and metatrochanters with one long seta. Basal third of femora with the same dense on flex side ( Fig. 8B ); another surface of femora with sparse puncturation and short setae. Pro- and metatibiae slightly curved, mesotibiae stright. Pro- and mesotarsomeres 1–4 widened, trasverse, pro- and mesotarsomere 1 as wide as apex of protibia.

Abdomen ( Figs 8B–D, H–J ). Abdominal ventrites with moderately dense, fine puncturation and simple, moderate, short setae (shortly pubescent); ventrite 5 with coarser punctures and longer setae at apex. Genitalia ( Figs 8C, D, H–J ). Apical part of basal piece of aedeagus smooth, without rugosity. Apical piece of aedeagus with wide median longitudinal impression; lateral margins straight at middle and straightly narrowed to narrowly rounded apex.

Female. Unknown.

Etymology. The species is named in honour of my first teacher during student times and known specialist on Curculionidae DrSc. Yury Arzanov (Rostov-on-Don).

Differential diagnosis. The new species is close to E. merkli by the structure of the aedeagus (basal piece without rugosity, apical piece with median longitudinal impression) and the narrow, not beaded pronotum with weakly rounded margins, but differs in following characters: the lower half of temples is impressed behind the eye (weakly rounded in E. merkli ); lateral margins of pronotum straight at apical quarter and widely emarginated in basal quarter (regularly rounded in E. merkli ); prothoracic hypomera with microrugosity and fine sparse smooth punctures (large, coarse, round foveae and smooth interpuncture space between them in E. merkli ); protrochanters with two long setae (one long seta in E. merkli ).

Figures

FIGURE 8. Euboeus arzanovi sp. nov., habitus, details of structure. A = male, dorsally; B—male, ventrally; C = tegmen, ventrally; D = apical piece of aedeagus, dorsally; E = male, head and pronotum, dorsally; F = ditto, dorso-laterally; G = prothoracic hypomeron; H = male inner sternite VIII, ventrally; I = spiculum gastrale; J = median lobe of aedeagus with inverted connective membrane, ventrally.