Agriotypus wangpiensis Choi & Lee sp. nov.

Figs 2, 3, 4, 5, 6 E – G, 7 B, D, 8 C, D

Type materials.

Holotype ♀, South Korea: 31. v. 2022, Wangpicheon, Uljin-gun, Gyeongsangbuk-do, South Korea (S. J. Kwon), rearing date: 12. vi. 2022. Type depository: DNUE-IIEI.

Paratypes. 8 ♀♀, 31. v. 2022, Wangpicheon, Uljin-gun, Gyeongsangbuk-do, South Korea (S. J. Kwon), rearing date: 7–17. vi. 2022 (DNUE-IIEI, EUM) ; 2 ♀♀, ditto, (NNIBR - NNIBRIN 166268, NIER); 16 ♂♂, Wangpicheon, Uljin-gun, Gyeongsangbuk-do, South Korea (S. J. Kwon), rearing date: 6–15. vi. 2022 (DNUE-IIEI, EUM) ; 2 ♂♂, ditto, (NNIBR - NNIBRIN 166269, NIER) .

Diagnosis.

Females of Agriotypus wangpiensis sp. nov. can be distinguished from all other species for which the female is known by the combination of the following characters: 1) metasomal tergite II lacking dorsal and dorsolateral carinae anteriorly (Fig. 5 F) (present in all species of the A. himalensis species group); 2) clypeus in lateral view with summit of convexity angulate (Fig. 5 B) (rounded in A. armatus and A. silvestris); 3) clypeus in anterior view with summit of convexity rounded medially (Fig. 5 C) (acutely pointed medially in A. gracilis); 4) pronotum with a long and strong epomia extending dorsal of pronotal furrow (epomia short in A. changbaishanus, not extending dorsal of furrow as in Fig. 5 B in Bennett 2001); 5) fore wing lacking complete longitudinal bands proximal and distal to pterostigma, the wing predominantly dark with at most hyaline fascia in basal, discosubmarginal and marginal cells (Fig. 6 F, G) (fore wing with complete longitudinal, hyaline bands proximal and distal to pterostigma in A. jilinensis as in Fig. 6 C). Note that the female of A. succinctus ( A. armatus group) is not known. In addition, females of several species of the A. himalensis species group are unknown, but it is likely they could be distinguished from the new species by character 1 (above). Males of Agriotypus wangpiensis sp. nov. can be distinguished from all other species for which the male is known by the combination of characters 1–4 in the female diagnosis as well as the face lacking a medial, vertical ridge (ridge present in A. jilinensis). All males of the A. armatus group are known.

Description.

Female (Adult). Body length 5.0– 6.8 mm; fore wing length 4.0– 4.9 mm.

Head. Head width 1.0 times as wide as its median height (Fig. 5 C). Face width (minimum length of inner orbit) 1.57 times as wide as its median height (length between antennal socket and clypeal margin), convex medially, without a median vertical ridge, with coarse rugosity and dense pubescence (Fig. 5 C). Antenna with 20 flagellomeres, 0.6 times as long as fore wing. Temple behind eyes roundly narrowed in dorsal view. Transverse diameter of eye 0.9 times as wide as temple in dorsal view. Frons finely densely punctulate-reticulate. Area between antennal sockets lacking a glabrous short longitudinal tubercle. Antennal scrobe deep. POL: OOL = 1: 2. Clypeus in anterior view with apical margin round; anterior edge in profile moderately convex; summit of convexity in lateral view angulate; shape of angular summit of clypeus in anterior view rounded medially (Fig. 5 C). Distance between anterior tentorial pits shorter than length between a tentorial pit and eye; malar space 1.3 times as long as basal width of mandible; mandible twisted, lower tooth longer than upper one. Occipital carina strong.

Mesosoma. Pronotum with long and strong epomia, upper area of pronotum with more than 10 fine carinae dorso-posteriorly. Mesoscutum shiny, anterior half of median lobe and outer side of lateral lobes punctate and setose; notauli distinct, meeting in posterior 0.3 (Fig. 5 D, E). Scutellum in dorsal view triangular, 1.8 times as long as its anterior width including spine, 1.25 times as long as length of propodeum; scutellum with lateral carina at base, and spine smooth in lateral view, distinctly upcurved (Figs 5 E, 8 D). Mesopleuron and metapleuron densely punctate, reticulate and pubescent, with longitudinal groove deep and wide, without longitudinal carina on anterior edge at mid-height; epicnemial carina curving sharply anteriorly to meet anterior edge of mesopleuron and with a vertical extension dorsally. Sternaulus present. Dorsal area of mesopleuron with transverse carinae. Propodeum finely coriaceous-punctate; lateromedian longitudinal and lateral longitudinal carinae weakly convergent posteriorly (Fig. 5 F).

Wings. Fore wing with 1 cu-a distad of M & Rs; abscissa of vein M between 2 rs-m and 2 cu-m 2.5–2.7 times as long as 2 rs-m. Hind wing with 8 distal hamuli; vein 1 / Cu & 1 cu-a intercepted by 2 / Cu in lower 0.25–0.35 (Fig. 6 G).

Metasoma. Metasomal tergite I 3.8 times as long as its apical width, 1.7 times as long as length of propodeum; metasomal tergite I finely punctulate-reticulate, spiracles situated in anterior 0.45, lateromedian and dorsolateral carinae complete and strong, reaching to apex. Metasomal tergite II lacks dorsal and dorsolateral carinae. Ovipositor sheath 0.7 times as long as length of hind basitarsus.

Colour. Almost black. Apical spine of scutellum, posterior metasomal tergites slightly reddish brown. Fore wing generally infuscate, with small hyaline spots occupying middle of basal cell, discosubmarginal cell and marginal cell: hyaline spot of basal cell at basal 0.6 on the basal cell of fore wing, hyaline spots of discosubmarginal cell narrow, distal half of marginal cell with hyaline spot, fourth submarginal cell without hyaline spot (Fig. 6 G).

Variation. In some specimens, apical area of fore wing hyaline (Fig. 6 F).

Male. Body length 5.0–6.0 mm; fore wing length 4.1–5.1 mm. Antenna with 27–29 flagellomeres. Fore wing with abscissa of vein M between 2 rs-m and 2 m-cu 2.0 times as long as 2 rs-m. Hind wing vein 1 / Cu & 1 cu-a intercepted by 2 / Cu at lower 0.43 (Fig. 6 E). Metasomal tergite I 4.1–5.0 times as long as apical width, with incomplete dorsolateral carinae, extending only to 0.35 length of segment; lateromedian carinae of metasomal tergite I incomplete, but extending past spiracles. Fore wing hyaline (Figs 2, 5 H, 6 E); hind wing hyaline. Otherwise, similar to female. Male genitalia and hypopygium shown in Fig. 7 B, D, with digitus relatively strongly elongated, longer than half of paramere, somewhat broadened toward apex, dorso-apical corner rounded and ventro-apical corner produced (Fig. 7 D). Apex of paramere slightly convex. Penis valve curved ventrally, apex of penis valve produced, dorso-apical portion with a tooth; basal apodeme of aedeagus striate dorsally.

Last instar larva (Fig. 4). Body length 3.5 mm; body maximum width: 2.0 mm. Cephalic sclerites (Fig. 4 D). Hypostoma (hs) wide; stipital sclerite (ss) moderately curved and sclerotized; labial sclerite (lbs) roundly triangular, narrowing dorsally, dorsal part almost 0.5 times as wide as ventral part, moderately sclerotized, except dorsally, with salivary orifice (s) circular (Fig. 4 C). Apical part of larva with caudal filaments, paired and curved, apical part of caudal filaments darker (Fig. 4 B). Mandible triangular, strongly sclerotized with 6–8 small toothlike projections medially on dorsal edge (Fig. 4 D). Body color ivory (Fig. 4 A).

Host.

Goera japonica Banks, 1906 ( Trichoptera: Goeridae). (Det. Dr. Kwon). The Wangpicheon River originates from Mt. Geumjangsan (849 m), which straddles Subi-myeon, Yeongyang-gun and Onjeong-myeon, Uljin-gun, GB, and flows into the East Sea through Uljin-gun.

Distribution.

South Korea.

Region.

Eastern Palaearctic.

Etymology.

The species is named after ‘ Wangpicheon’, from the location where the type specimens was collected. (Korean name: Wang-pi-mul-beol).

Molecular data.

COI barcode sequences (GenBank accession nos. OQ 981233.1 – OQ 981241.1), Echthrus reluctator (BOLD GMGMH 1512-14) and Endasys patulus (BOLD HYCNL 036-19; NCBI MK 959419) (Figs 9, 10).

Remarks.

This new species is similar to A. silvestris Konishi & Aoyagi, 1994, but the female can be distinguished from the latter by the profile of the clypeus (convex with angulation but, roundly convex without angulation in A. silvestris); the ratio of the lengths of the scutellar spine and the propodeum (scutellar spine length 1.25 times as long as propodeum but only 0.75 times as long as in A. silvestris); the colour of the female fore wing (basal areas of fourth submarginal cell and third discal cells of fore wing almost completely dark without hyaline spot (arrows in Fig. 6 G) compared to A. silvestris that has the basal 1 / 4 of these cells hyaline (arrows in Fig. 6 B)); length of metasomal tergite I of female (3.8 times as long as length of posterior width but 4.6 times as long as posterior width in A. silvestris); hypopygium (evenly round median dorsal margin but, emarginate in median dorsal margin in A. silvestris).