Hypoganus fedorenkoi, Prosvirov & Qiu, 2023

Prosvirov, Alexander S. & Qiu, Lu, 2023, Hypoganus fedorenkoi sp. nov., the first record of the genus in Vietnam (Coleoptera: Elateridae: Dendrometrinae), Zootaxa 5306 (1), pp. 54-60 : 55-59

Hypoganus fedorenkoi sp. nov.

( Figs. 1–3 , 7, 9, 11, 14–17 , 18 )

Type material. Holotype, male ( ZMMU): “N Vietnam, Lao Cai Prov., Hoang Lien Son Mt. ridge, env. Fansipan Mt, Tram Ton, h=1950–2100, 17.VII.2007, leg. D. Fedorenko ” [Northern Vietnam, Lào Cai Prov., Hoang Lien Son Mt. Range, env. Fansipan Mt. , Tram Ton Pass].

Diagnosis. This species resembles its congeners known from China, namely H. tibetis Čechovský & Kubáň, 1997 , H. sichuanensis Schimmel & Tarnawski, 2017 and H. wennae Qiu & Prosvirov, 2017 , but can be easily distinguished from them by the several characters (mostly compared the characters of males, except for H. sichuanensis , which known only from females). It differs from H. tibetis and H. sichuanensis in the almost completely blackish body (blackish-brown or partially brownish in the latter two), medially emarginated frons (almost straight or rounded in the latter two), rather long and narrowly sharply pointed hind angles of the pronotum (shorter and less sharply pointed in the latter two), and more parallel-sided elytra not broadened in the posterior 1/3 (widest in the posterior 1/ 3 in the latter two). Hypoganus fedorenkoi sp. nov. seems most closely related to H. wennae but differs in the notably longer and strongly serrated antenna, which slightly exceed the hind angle of pronotum (just reach the hind angle of pronotum and with sub-triangular middle antennomeres in H. wennae ) ( Figs. 7, 8 ), large and strongly protuberant eye (medium-sized and moderately convex in H. wennae ), pronotum more parallel-sided (notably narrower at the fore angles than near hind angles in H. wennae ) ( Figs. 11, 12 ), paramere almost straight in the anterior 1/3 (distinctly curved in the anterior 1/ 3 in H. wennae ), and penis rather slender, subgradually narrowed at the apex (the penis robust, sharply narrowed at the apex in the anterior 1/3) ( Figs. 18, 19 ).

Description. Male (holotype): body length 12.3 mm; body width 3.6 mm; pronotum length 2.6 mm; pronotum width 2.7 mm; elytra length 8.5 mm; elytra width 3.6 mm; antenna length 4.6 mm; antennomere IV length 0.5 mm, width 0.4 mm. Body shining, smooth, elongate and rather flat, dorsum sparsely covered with small punctures and fine golden pubescence (at head and elytral interstriae punctures denser and notably larger), underside with relatively denser punctation and pubescence; body blackish with deep brown admixture, eye and antennomeres IV–XI dark brown; mouthparts, apex of prosternal lobe, partially hind angles of pronotum, base of hypomeron, apex of prosternal process, apex of abdomen, and partially legs reddish-brown; claws yellowish ( Figs. 1–3 ).

Head: vertex trapeziform between eyes, with shallow V-shaped depression, surface rather unevenly densely covered with large, deep and umbilicate punctures (intervals between punctures varying from 0.5 to 3 diameters of one puncture), with sparse, short pubescence ( Fig. 11 ). Frons medially slightly emarginated; frontal carina step-like protruding, ridged above antennae, medially smoothed ( Fig. 9 ). Eye large, strongly convex ( Figs. 9, 11 ). Antenna slightly exceeding hind angle of pronotum, with yellowish recumbent short pubescence, pubescence very dense at antennomeres IV to XI, antennomeres II to XI apically with certain erect long setae, strongly serrated from antennomere IV to X, and gradually narrower from antennomere IV on; scape elongate, ovate; pedicel shortest, almost conical, slightly longer than wide; flagellum conical, distinctly longer than wide; antennomeres IV to X triangular; antennomere XI trapeziform at apex ( Fig. 7 ). Labrum transverse, narrow, wrinkled and punctate, medially with some long yellowish setae ( Fig. 9 ).

Thorax: pronotum slightly wider than long, widest near middle, only slightly narrowed towards fore angles, markedly narrowed toward hind angles; smooth, sparsely covered with small, shallow, simple punctures (intervals between punctures mostly longer that 3 diameters of one puncture) and short pubescence; disc slightly convex, with shallow longitudinal groove in posterior 1/2; hind angles long, distinctly divergent, strongly narrowed at apex and sharply pointed ( Fig. 11 ). Hypomeron punctate and pubescent similarly to pronotum, in posterior 1/4 impunctate; prosternal sutures very slightly emarginated in anterior 1/4; prosternum with uneven surface, slightly depressed laterally in middle 1/3, punctate and pubescent as hypomeron over most of anterior 1/2, denser than hypomeron in posterior 1/2 (at disc intervals between punctures about as long as 2–3 diameters of one puncture); prosternal lobe with dense, large, deep and umbilicate punctures, anterior margin distinctly edged, posteriorly with transverse median depression; prosternal process rather thin and long, sloping behind procoxae, slightly tapered at apex, bluntly rounded ( Fig. 3 ). Metaventrite punctate and pubescent mostly as posterior 1/2 of prosternum.

Scutellum ( Fig. 11 ) flat, tongue-shaped, very sparsely punctate and pubescent; anterior margin slightly convex, apex obtusely truncated.

Elytra elongate, almost parallel-sided over basal 3/4 of length, gradually narrowing in posterior 1/4, widest behind middle; interstriae clearly elevated, smooth, sparsely punctate and pubescent; each stria with a row of punctures, each puncture elongate, intervals between punctures about equal to 1–3 lengths of one puncture ( Fig. 1 ). Metathoracic wings completely developed, reaching apices of elytra.

Legs slender, tarsomeres from I to IV getting shorter, tarsomere V longest, tarsomere IV shortest.

Abdomen: punctate and pubescent similarly to metaventrite, but punctures on average denser, in posterior 1/2 of apical ventrite punctures large, deep and umbilicate; each ventrite with rather deep depression sublaterally ( Fig. 3 ), ventrites III to V with unusual proportions, probably due to malformation. Tergite VIII cordiform, densely covered with microtrichia, except for most of basal portion, laterally and at apical margin with some short and long setae ( Fig. 14 ); tergite IX densely covered with microtrichia in lateral portions, at lateral margins with some short and long setae, apical portion triangularly concave ( Fig. 16 ); tergite X densely covered with microtrichia, except for bare basal portion, obtusely rounded at apex ( Fig. 16 ); sternite VIII transverse, lateral portions densely covered with microtrichia, pubescent with some short and long setae, membranous part densely covered with microtrichia in anterior 1/2, with several short setae at anterolateral portions ( Fig. 15 ); sternite IX obtusely rounded at apex, rather densely pubescent with short setae in posterior 1/3, at apical margin with short and several long setae, medial part with some short setae ( Fig. 17 ).

Genitalia: penis slender, slightly longer than paramere, gradually narrowed towards apex, at apical part constricted; paramere almost straight in anterior 1/2, at apex shortly rounded, apical margin almost straight, apical hook sharply pointed ( Fig. 18 ).

Female and immature stages. Unknown.

Distribution. Northern Vietnam (Lào Cai Province).

Bionomics. According to the label data and considering the known biology of other congeners, it is likely that H. fedorenkoi sp. nov. inhabits tropical evergreen forests at the middle altitudes of the Hoang Lien Son Mountain Range ( Figs. 21, 22 ), but the exact ecological preferences of this species are unknown. Possibly H. fedorenkoi sp. nov. is nocturnal, as indicated by its strongly enlarged eyes.

Etymology. Named in the honour of its collector, the distinguished entomologist Dmitry N. Fedorenko.

Figures

FIGURES 1–6. Habitus of Hypoganus spp.; 1–3: H. fedorenkoi sp. nov., holotype, male (body length 12.3 mm); 3–6: H. wennae, male (body length 12.5 mm; China, Yunnan Prov.). 1, 4. Dorsal view. 2, 5. Lateral view. 3, 6. Ventral view. Not to scale.

FIGURES 7–17. Morphology of Hypoganus spp.; 7, 9, 11, 14–17: H. fedorenkoi sp. nov., holotype, male; 8, 12: H. wennae, male (China, Yunnan Prov.); 10, 13: H. stepanovi, male (Abkhazia). 7, 8. Antenna, lateral view. 9, 10. Head, frontal view. 11–13. Head, pronotum and base of elytra, dorsal view. 14. Tergite VIII, dorsal view. 15. Sternite VIII, ventral view. 16. Tergite IX–X, dorsal view. 17. Sternite IX, dorsal view. Not to scale.

FIGURES 18–20. Aedeagi of Hypoganus spp., ventral view. 18. H. fedorenkoi sp. nov., holotype. 19. H. wennae (China, Yunnan Prov.). 20. H. inunctus (Austria). Not to scale.

FIGURES 21, 22. Habitat of Hypoganus fedorenkoi sp. nov.: Northern Vietnam, Lào Cai Prov., environs of Hoang Lien Son Mt. Range in Hoàng Liên National Park (photographs by A.S. Prosvirov).