Euboeus (Pelorinus) krivokhatskyi, 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 : 472-474

Euboeus (Pelorinus) krivokhatskyi sp. nov.

( Fig 14 )

Type material. Holotype, ♂ ( HNHM): Iran, Gilan Prov.: “ Kelishum [ Klishom ] 2000 m südl. Langerud [Langarud] 4.viii.1967 ”, “ Gilan ( Iran) Heinz leg.”, “ Probaticus sp. det. Kaszab ” . Paratype, ♀ ( SMNS): Iran, Gilan Prov., 20 km SE Deilaman , 1900 m, 22.04.2003 (leg. G. Sama) ; 1♂ ( NMPC): Iran, Koedestan [Kurdestan] Prov., Pass 26 km SE Saqqez, 17.iv.2002 (leg. S. Kadlec) ; 1♀ ( NME): Iran, Luristan [Lorestan] Prov., pass 2300 m W Nour-Abad (SE Nahavand), oberh. Grotte v. Gamasiab [upper grotto of Gamasiab], 10.iv.2014 (leg. Heinz) .

Description. Male. Body slender, black, shiny ( Fig. 14A ), but weakly shiny in the Lorestan Population. Measurements: Y = 1.59; PH w = 1.55; P w P l = 1.3; E l E w = 1.6; EH w = 1.83; EP w = 1.17; EP l = 2.48. Body length 12.5 mm, width 4.5 mm.

Head ( Fig. 14B, D, E ). Anterior margin of epistoma slightly rounded and emarginated near angles. Head widest at eye level. Eyes strongly convex, angulate in dorsal view, circumocular impression deep, moderately wide ( Figs 14B, D, E ). Lateral margins of genae angularly rounded. Puncturation of head fine and sparse, interpuncture distance 1.5–2 times as long as puncture diameter; punctures coarser on genae. Ventral side of epicranium coarsely and densely punctured around submentum and coarse and sparse on temples. Antennae comparatively short, with only three apical antennomeres, extending beyond base of pronotum, reaching less than 1/4 of elytral length.

Prothorax ( Figs 14D–F ). Pronotum widest ahead of middle, transverse ( Fig. 14D ). Lateral margins of pronotum moderately rounded, slightly emarginated near base; anterior margin weakly widely emarginated; base straight. Antero-lateral corners not projected, obtuse, narrowly rounded at apex; postero-lateral corners weakly obtuse, narrowly rounded at apex. Lateral margins not beaded; anterior margin beaded only laterally ( Figs 14D, E ). Disc of pronotum evenly weakly convex, not flattened along lateral margin, without impressions. Puncturation of disc fine and sparse, punctures small, but surface around punctures impressed, puncture diameter 3 times as short as interpuncture distance; punctures round. Prosternum with coarse and sparse simple puncturation ( Figs 14B, F ). Prothoracic hypomera not flattened flattened along margin, with coarse, sparse, large, round punctures on smooth surface at outer half and dense and coarse merged punctures on inner half; surface without microgranulation ( Fig. 14F ). Prosternal process shiny, sparsely punctured, slightly convex at apex, not beaded ( Figs 14B, F ).

Pterothorax ( Figs 14A, B ). Scutellar shield with very weakly rounded margins, coarsely sparsely punctured. Elytra shiny, moderately elongate, widest at middle; punctures in striae fine, round, widely spaced; punctures in interstriae fine and sparse, much smaller than strial ones ( Fig. 14A ). Anterior half of mesoventrite pubescent, coarsely and densely wrinkled. Mesepisterna, mesepimera and metepisterna with coarse and dense puncturation of large foveae; metaventrite and intercoxal part of mesoventrite with moderately coarse and moderately dense punctures; metaventrite covered with very short setae ( Fig. 14B ).

Legs. Trochanters with brush of short dark-reddish setae and one long seta ( Fig. 14B ). Basal third of meso- and metafemora with the same brush on flex side, the same part of profemora without this brush ( Fig. 14B ). Protibiae weakly S-shaped, mesotibiae weakly curved, metatibiae weakly bent inward. Pro- and mesotarsomeres 1–4 strongly widened, trasverse, but pro- and mesotarsomere 1 not wider than apex of protibia.

Abdomen ( Figs 14B, G–K ). Abdominal ventrites with the same puncturation as on metaventrite and very short setation (not pubescent) ( Fig. 14B ); Ventrite 5 with several sparse long setae at apex. Genitalia ( Figs14G–K ). Apical part of the basal piece of aedeagus with longitudinal rugosity ( Fig. 14K ). Apical piece subtriangle, narrowly rounded at apex, dorsal surface with longitudinal small median groove ( Fig. 14K ).

Female ( Fig. 14C ). Body much robuster and dull. Eyes smaller (Y=1.36 vs. 1.59 in male). Antennae short, not reaching base of pronotum. Lateral margins of pronotum beaded at basal half. Postero-lateral corners of pronotum right. Metatibiae straight. Measurements: Y = 1.36; PH w = 1.67; P w P l = 1.29; E l E w = 1.37; EH w = 2.2; EP w = 1.32; EP l = 2.34. Body length 17 mm, width 7 mm.

Etymology. The species is named in memory of my colleague Viktor Anatolievich Krivokhatsky (1954–2021), the world specialist on Neuroptera , Myrmeleontidae ( Volkovitsh et al. 2021, Ovtshinnikova et al. 2021).

Differential diagnosis. The new species is close to E. merkli by having not beaded lateral margins of pronotum ( Figs 14E , 15E ) and smooth punctured sculpture of the prothoracic hypomera ( Figs 14F , 15F ), but is different from other congeners of the huedepohli species-group by strongly convex (lateral margin angulate in dorsal view) eyes ( Fig. 14D ) and smooth prothoracic hypomera with sparse coarse punctures (except for E. merkli , which has the similar sculpture of hypomera). Euboeus krivokhatskyi has a similar shape of the pronotum as E. grimmi , not beaded male pronotum as is in E. merkli and the apical part of the basal piece of the aedeagus with longitudinal rugosity as in E. huedepohli and E. kasatkini . The new species additionally differs from:

– E. huedepohli and E. kasatkini by not beaded laterally male pronotum and partly beaded female pronotum ( Figs 14D, E ) (lateral margins of the pronotum are beaded in both comparable species ( Figs 11E, F , 13E, F )), and the absence of the dense brush of setae at the base of the flex side of profemora ( Fig. 14B ), the shape of the apical piece of aedeagus;

– E. grimmi by shiny body dorsally, at least in the Elburs population ( Fig. 14A ) (weakly shiny in E. grimmi ( Fig. 9A )), not beaded laterally male pronotum ( Figs 14D, E ) (lateral margins of the pronotum are beaded in E. grimmi ( Fig. 9D, E )), the absence of the dense brush of setae at the base of the flex side of profemora ( Fig. 14B ), the apical part of the basal piece of the aedeagus with longitudinal rugosity ( Fig. 14K ) (smooth in E. grimmi ( Fig. 9K )), the apical piece of the aedeagus with longitudinal median groove ( Fig. 14K ) (median keel in E. grimmi ( Fig. 9K ));

– E. merkli by the shiny male body at least in the Elburs population (14A) (weakly shiny in E. merkli (15A)), wider and the widest ahead of the middle pronotum with rounded lateral margins ( Fig. 14D ) ( E. merkli has narrower, widest at middle pronotum, with very weakly rounded lateral margins ( Fig. 15D )), the presence of dense brush of setae at the base of the flex side of meso- and metafemora ( Fig. 14B ) (absence of the femoral brush in E. merkli ( Fig. 15B )) and almost bare abdominal ventrites ( Fig. 14B ) (pubescent in E. merkli ( Fig. 15B )).

Figures

FIGURE 9. Euboeus grimmi sp. nov., habitus, details of structure. A = male, dorsally; B = male, ventrally; C = female, dorsally; D = male, head and pronotum, dorsally; E = ditto, dorso-laterally; F = prothoracic hypomeron; G = male inner sternite VIII, ventrally; H = spiculum gastrale; I = tegmen, ventrally; J = median lobe of aedeagus with inverted connective membrane, ventrally; K = apical piece of aedeagus, dorsally.

FIGURE 11. Euboeus huedepohli, habitus, details of structure. A = male, dorsally; B = male, ventrally; C = male metatibiae; D = female, dorsally; E = male, head and pronotum, dorsally; F = ditto, dorso-laterally; G = prothoracic hypomeron; H = male inner sternite VIII, ventrally; I = spiculum gastrale; J = ventral setose connective membrane between median lobe and tegmen; K = tegmen, ventrally; L = median lobe of aedeagus, ventrally; M = apical piece of aedeagus, dorsally.

FIGURE 13. Euboeus kasatkini sp. nov., habitus, details of structure. A = male, dorsally; B = male metatibia; C = male, ventrally; D = female, dorsally; E = male, head and pronotum, dorsally; F = ditto, dorso-laterally; G = prothoracic hypomeron; H = male inner sternite VIII, ventrally; I = spiculum gastrale; J = tegmen, ventrally; K = median lobe of aedeagus, dorsally; L = dorsal and ventral connective membranes between median lobe and tegmen; M = apical piece of aedeagus, dorsally.

FIGURE 14. Euboeus krivokhatskyi sp. nov., habitus, details of structure. A = male, dorsally; B = male, ventrally; C = female, dorsally; D = male, head and pronotum, dorsally; E = ditto, dorso-laterally; F = prothoracic hypomeron; G = male inner sternite VIII, ventrally; H = spiculum gastrale; I = tegmen, ventrally; J = median lobe of aedeagus, dorsally; K = apical piece of aedeagus, dorsally.

FIGURE 15. Euboeus merkli sp. nov., habitus, details of structure. A = male, dorsally; B = male, ventrally; C = female, dorsally; D = male, head and pronotum, dorsally; E = ditto, dorso-laterally; F = prothoracic hypomeron; G = male inner sternite VIII, ventrally; H = spiculum gastrale; I = tegmen, ventrally; J = median lobe of aedeagus, ventrally; K = apical piece of aedeagus, dorsally.