Hypocharassus cavitarsus, Kim & Suh, 2022

Kim, Young-Kun & Suh, Sang Jae, 2022, A new species of the genus Hypocharassus Mik (Diptera, Dolichopodidae) from Korea, Biodiversity Data Journal 10, pp. 82851-82851 : 82851

Hypocharassus cavitarsus sp. n.

Materials

Type status: Holotype. Occurrence: recordedBy: Young-Kun Kim & Sang Jae Suh; sex: male; lifeStage: adult; Taxon: scientificName: Hypocharassus cavitarsus; family: Dolichopodidae; Location: country: Korea; countryCode: KR; stateProvince: Jeollanam-do; county: Sinan-gun; municipality: Imja-myeon; locality: Samdu-ri ; verbatimLatitude: 35°03'46.7"N; verbatimLongitude: 126°03'31.2"E; Event: year: 2021; month: 6; day: 19 Type status: Paratype. Occurrence: recordedBy: Young-Kun Kim & Sang Jae Suh; sex: 4 females; lifeStage: adult; Taxon: scientificName: Hypocharassus cavitarsus; family: Dolichopodidae; Location: country: Korea; countryCode: KR; stateProvince: Jeollanam-do; county: Sinan-gun; municipality: Imja-myeon; locality: Samdu-ri ; verbatimLatitude: 35°03'46.7"N; verbatimLongitude: 126°03'31.2"E; Event: year: 2021; month: 6; day: 19 Type status: Paratype. Occurrence: recordedBy: Young-Kun Kim & Sang Jae Suh; sex: 11 males, 7 females; lifeStage: adult; Taxon: scientificName: Hypocharassus cavitarsus; family: Dolichopodidae ; Location : country: Korea; countryCode: KR; stateProvince: Chungcheongnam-do; county: Taean-gun ; municipality: Taean-eup ; locality: Donae-ri ; verbatimLatitude: 36°49'03.4"N; verbatimLongitude: 126°19'17.9"E; Event : year: 2021; month: 7; day: 14

Description

Male (Fig. 1 A)

Head inverted triangle-shape at anterior view and metallic bluish green with thick whitish pruinosity; vertex slightly concave; ocellar triangle convex; 3 ocellus present; ocellar seta almost straight and divergent and as long as distance between median ocellus and lateral ocellus; postoceller almost straight and approximately 0.5 times shorter than ocellar seta; vertical seta proclinate and approximately 0.5 times shorter than ocellar seta (rarely absent in some specimens); postvertical seta proclinate and convergent and approximately 1-2 times longer than ocellar seta; frons broadened upwards; width between frons and face as long as compound eye at anterior view; face slightly broadened downwards; clypeus subparallel downwards and apically round; compound eye with tiny pale setulae between facets; upper postocular setae black in a single row; lower postocular setae pale and combined with occipital setae; upper occiput flat; lower occiput with thick pale setae; antenna black; scape bare; pedicel setose at apical margin; postpedicel check mark shape and ventral projection 2/5 times shorter than dorsal projection; arista-like stylus thick and two segmented and apical segment minutely longer than basal segment and placed apically; palpus basally grey and apically yellow with pale setulae; proboscis large and black with pale setulae (Fig. 1 C).

Thorax metallic bluish green with thick whitish pruinosity and mainly black setae; mesonotum with violet vittae between acrostichal and dorsocental setae starting from anterior scutum and then fading before reaching the scutellum; 3-16 tiny acrostichal setae irregularly biseriate; 14-18 dorsocentral setae tiny, except the long last one; postpronotal lobe with 1 (rarely 2) seta and some pale setulae; 3-5 tiny intra-alar setae, 1 (rarely 2) presutural supra-alar, 3 postsutural supra-alar, 1 (rarely 2) notopleural, 1 postalar setae present; posterial scutum round; scutellum approximately 0.5 times shorter than width and apically round; 2-3 (rarely 4) scutellar setae present and as long as length of scutellum and laterals slightly smaller than median seta; proepisternum with pale setulae; anepisternum, katepisternum, anepimeron, katepimeron, meron and laterotergite bare.

Legs mainly metallic bluish green with thick whitish pruinosity; all coxae and trochanter with pale setulae; fore femur and mid femur with pale setulae and 1 apical posteroventral seta, except black dorsal setulae at apical half; hind femur with black dorsal and pale ventral setulae and 1 apical anterodorsal and 1 posteroventral seta; all tibiae with 1-3 anterodorsals and 1-3 posterodorsal setae and apical ring of setae; all tarsi with 2 long ventral setae at apex of tarsomeres 1-4, respectively; tarsomere 1 grey and almost same or slightly shorter than total length of tarsomeres 2-5; tarsomeres 2--5 basally yellow and apically grey; fore tarsomere 4 with anterior projection and 2 setae at apex; fore tarsomere 5 anteriorly crooked and gradually widened towards apex and with anterior projection at base; mid tarsomeres 4 and 5 gradually broadened towards apex; mid tarsomeres 5 cone-shaped; hind tarsomeres 4 and 5 slightly broadened towards apex, but less broad than mid tarsomeres 4 and 5; all claws long, approximately twice longer than pulvillus; basal half of fore anterior claw broad, almost equal to width of pulvillus; all empodium pale, narrow feather shaped and curved upwards; pulvillus greyish brown (Fig. 1 F-H); length of tibia and tarsus of fore leg (mm), 1.59: 0.65: 0.16: 0.13: 0.8: 0.31; mid leg, 1.81: 1.15: 0.29: 0.27: 0.19: 0.34; hind leg, 2.31: 1.34: 0.36: 0.32: 0.26: 0.36.

Wing simple and hyaline with dark brown veins; C ending at M1; Sc combined at half of R1; R2+3 and R4+5 slightly diverging towards wing tip; R4+5 and M1 divergent before dm-m, then slightly convergent towards wing tip; r-m crossed at branching point of R2+3 and R4+5; M4 fold-like at wing tip; dm-m straight; CuA+CuP fold-like and ending before reaching wing tip; alula absent (Fig. 1 D); calypter pale yellow with pale setulae; halter pale yellow with brown base.

Abdomen metallic bluish green with whitish pruinosity; tergum with black setulae, except lateral pale setulae; sternum with pale setulae; sternite 1 membranous, except lateral small sclerotised apex; sternite 4 with small spikes at posterior median apex; sternite 5 medially concave and membranous (Fig. 1 E); epandrium dorsally broad, slightly broader than height; hypandrium fused to epandrium; epandrial lobe bacilli form, approximately 2.5 times as long as width; inner surstylus dorsally crooked bacilli form; outer surstylus dorsally broad with inner projection; phallus narrow and slightly crooked to venter at apex; cerci fused together and forming a trident shape (Fig. 2 ).

Length: body without antenna 5.1-5.3 mm, antenna 0.9-1.0 mm and wing 4.7-5.5 mm.

Female (Fig. 1 B)

Almost identical to male, except for the following characteristics: all tarsomeres 4 and 5 only minutely broadened towards apex, fore and mid tarsus without any specific modification like male; sternite 4 without small spikes at posterior median apex; sternite 5 not medially concave and membranous.

Length: body without antenna 5.6-6.1 mm, antenna 0.9-1.0 mm and wing 6.2-6.5 mm.

Etymology

The species name is derived from a Latin word that translates to concave (cavus) tarsomere 5 of fore tarsus.

Distribution

Korea (Chungcheongnam-do, Jeollanam-do).

Figures

Figure 1. Hypocharassus cavitarsus sp. n. A male, lateral view; B female, lateral view; C male antenna, lateral view; D male wing, lateral view; E male fourth and fifth sternite, ventral view; F male fore tarsus, dorsal view; G male mid tarsus, dorsal view; H male hind tarsus, dorsal view. Scale bars: A-B and D = 1 mm; C, E-H = 0.5 mm.

Figure 2. Hypocharassus cavitarsus sp. n. male. A genitalia, lateral view; B ditto, ventral view; C ditto, dorsal view. Scale bars: A-C = 0.1 mm. Abbreviations: cer = cercus; epd = epandrium; hyp = hypandrium; i sur = inner surstylus; o sur = outer surstylus; phal = phallus.