Aulonothroscus longulus
Creators: name: Seung, Jinbae
name: Han, Taeman
name: Lee, Seunghyun
name: Lee, Minhyeuk
name: Lee, Seunghwan
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Throscidae
Aulonothroscus
Aulonothroscus longulus

description: Aulonothroscus longulus (Weise, 1879)
Trixagus longulus Weise, 1879: 148.
Aulonothroscus nipponicus Cobos, 1969: 50.
Diagnosis. Frons a paired frontal keel; frontoclypeus almost straight at apical margin; pronotum about 1.5 times as wide as long; length from anterior margin of pronotum to elytral apex about 2.4–2.5 times in male and 2.5–2.6 times in female as long as maximum width; prosternal process with marginal carinae laterally, almost reaching anterior margin of prosternum; aedeagus about 5.4 times as long as wide; phallobase deeply emarginate at middle on basal half, about 2.9 times as long as wide; parameres slender, widest at base, gradually narrowed apically, laterally evenly covered with short pubescence throughout; median lobe elongate, about 0.9 times as long as length of parameres.
Redescription (Fig. 2). Male. Body (Figs. 2A, C–D) 2.5–2.8 mm long and 1.0– 1.1mm wide; elongate and convex; widest at base of pronotum and elytra, length from anterior margin of pronotum to elytral apex about 2.4–2.5 times as long as maximum width; surface coloured dark red-brown, densely covered with recumbent golden setae. Head (Fig. 2E) deeply inserted into prothorax, coarsely punctate; frons with a pair of frontal keels between compound eyes, divergent posteriorly; anterior margin of frontoclypeus almost straight; compound eyes complete, without emargination; antennae (Fig. 2F) 11-segmented, with 3-segmented antennal club; scape stout; pedicel almost square, as long as wide; flagellomeres 3–8 subequal, adjacent to each other; flagellomeres 9 and 10 about 1.2 and 1.5 times wider than long, respectively; apical flagellomere asymmetrical, about 1.6 times longer than wide. Pronotum subtrapezoidal, subparallel-sided at basal two-fifths, then gradually narrowed anterad; about 1.4 times as wide as long; anterior margin weakly arcuate; disc evenly covered with deep punctures, slightly larger and sparser than those of head, becoming coarser, larger, and denser basally; intermingled with sparse microscopic punctures between coarse punctures. Scutellar shield subtriangular, gradually narrowed posterad; about 1.1 times wider than long; covered with fine punctures and setae. Elytra subparallel-sided, weakly narrowed posterad from basal half; about 1.9 times as long as wide; elytral stria complete; interstriae subflattened, mostly with single rows of punctures. Prosternum subparallel-sided, weakly arcuate laterally; anterior margin weakly trilobate; prosternal process with marginal carinae laterally, almost reaching anterior margin of prosternum; hypomeron with transverse impression connected with lateral margin of prosternum, forming deep cavity anteriorly and posteriorly; anterior cavity connected with anteriorly open notosternal groove to receive antennae; posterior cavity housing prothoracic leg. Metasternum covered with deep punctures, coarser, larger, and denser laterally and basally; sparsely scattered with microscopic punctures between deep punctures; oblique mesotarsal groove (Figs. 2C–D) deep, well-developed, extending from underneath mesocoxa to posterior angle of metasternum. Abdomen with five abdominal ventrites, strongly connated; covered with large and shallow puncture than those of metasternum, becoming coarser, larger, and denser laterally; densely setose; ventrite 5 broadly rounded at apex, laterally smooth. Aedeagus (Figs. 2J–O) trilobed, about 5.4 times as long as wide; phallobase deeply emarginate at middle on basal half, about 2.9 times as long as wide; parameres slender, widest at base, gradually narrowed apically, laterally evenly covered with short pubescence throughout; median lobe elongate, about 0.9 times as long as length of parameres. Legs moderately long, slender; mesotarsi (Fig. 2H) short, about 0.6 times as long as midtibia; tarsomere 1 about 1.5 times longer than 2–3 combined. Female (Fig. 2B) mostly similar to males, except for the following characters: length from anterior margin of pronotum to elytral apex about 2.5–2.6 times as long as maximum width; antennal club (Fig. 2G) less developed, smaller than those of male; flagellomeres 9 and 10 about 1.1 and 1.4 times wider than long, respectively; apical flagellomere asymmetrical, about 1.5 times longer than wide; mesotarsi (Fig. 2I) rather long and slender than male, tarsomere 1 about 1.2 times longer than 2-3 combined; genitalia shown as Figs. 2P–Q.
Material examined. (11) 2 females. Republic of Korea, Beopheung-ri, Mureungdowon-myeon, Yeongwol-gun, Gangwon-do, 04–18. VI.2015, Seung et al. leg., by flight intercept trap (SNU); 1 male and 2 females. Republic of Korea, Deoksu-ri, Danwol-myeon, Yangpyeong-gun, Gyeonggi-do, 23. VI –06.VII.2016, Seung et al. leg., by flight intercept trap (SNU); 1 female. Republic of Korea, Jeongbae-ri, Seojong-myeon, Yangpyeong-gun, Gyeonggi-do, 05–18. VI.2022, Seung et al. leg., by flight intercept trap (SNU); 2 males and 3 females. Republic of Korea, Sanga-dong, Andong-si, Gyeongsangbuk-do, 27. V –10. VI.2022, Seung et al. leg., by flight intercept trap (SNU).
Distribution. Korea (New record), Japan, Russia (Far East).
Remarks. Its elytron is prominently longer than other Palaearctic Aulonothroscus species. The ratio of ‘length pronotum + elytra’ to ‘maximum width’ is quite variable in this species, even among individuals of the same sex: 2.42–2.53 in males, 2.47–2.63 in females.
description: Published as part of Seung, Jinbae, Han, Taeman, Lee, Seunghyun, Lee, Minhyeuk & Lee, Seunghwan, 2024, Taxonomic review of the family Throscidae Laporte, 1840 (Coleoptera: Elateroidea) in Korea, the description of a new species with new generic and species records, pp. 267-278 in Zootaxa 5432 (2) on page 271, DOI: 10.11646/zootaxa.5432.2.6, http://zenodo.org/record/10898681