Lasioglossum (Acanthalictus) dybowskii (Radoszkowski, 1876)

Murao, Ryuki, Lee, Heung-Sik & Tadauchi, Osamu, 2014, Lasioglossum (Acanthalictus) dybowskii (Hymenoptera, Halictidae) newly recorded from South Korea, with a checklist of the genus Lasioglossum in Korean Peninsula, Journal of Hymenoptera Research 38, pp. 141-153 : 143-149

Lasioglossum (Acanthalictus) dybowskii (Radoszkowski, 1876) Figs 1 -17 , 19-25

Halictus dybowskii Radoszkowski, 1876: 110 [Lectotype: Institute of Systematic and Experimental Zoology, Polish Academy of Sciences, Krakow, Poland; ♀, Amur (Khabarovsk Terr., Russia designated by Pesenko 2007b: 107),]; Cockerell 1924: 582 [♂].

Halictus griseipennis Cockerell, 1924: 185 [Holotype: U. S. National Museum of Natural History, Smithsonian Institution, Washington, D.C., USA; ♀, Kongaus (Primorsky Terr., Anisimovka,), Russia]. Synonymy by Ebmer (1978a).

Evylaeus (Acanthalictus) dybowskii : Pesenko 2007b: 91 [in key], 107 [lectotype designated].

Lasioglossum (Evylaeus) dybowskii : Ebmer 1978a: 209, 211; Ebmer 1996: 284-285; Ebmer 2006: 568.

Specimens examined.

[NORTH KOREA] Gangwon-do: 1 ♀, Mt. Kongôsan (= Mt. Kumgangsan), 8. ix. 1931 (C. Takeya, ELKU, illustrated in Fig. 6 ). [SOUTH KOREA] Gangwon-do: 2 ♀, Mt. Gariwangsan, alt. 1100m, Jeongseon-gun, 37°27'15"N, 128°1'10"E, 10. vi. 2013 (O. Tadauchi leg., ELKU); Mt. Gariwangsan, Jeongseon-gun, 3 ♀, 30. vii. 2013 (HS. Lee, QIA), 2 ♀ 1 ♂, 30. vii. 2013 (R. Murao, 1 ♀ illustrated in Figs 11 , 13 , 1 ♀ in Figs 1 , 3 , 9-10 , 12 - 19 , 1 ♂ in Figs 2 , 4-5 , 14-16 , 20 , 22-25 ); 1 ♀, Mt. Odaesan, alt. 900m, 37°47'0"N, 128°32'19"E, 9. vi. 2013 (O. Tadauchi, ELKU); 2 ♀, Jingogae, Mt. Odaesan, 27. vii. 2001 (HS. Lee, QIA); BougMyong-ri, DongSan-myon, ChunChon-gun, 1 ♀, 26. iv. 1992 (O. Tadauchi, ELKU), 1 ♀, 22. v. 1992 (O. Tadauchi, ELKU, illustrated in Fig. 7 ); 5 ♀, Hwangiri, Seo-myeon, Yangyang-gun, 37°56'25.8"N, 128°31'19.7"E, 29. iv. 2007 (HS. Lee, QIA); 2 ♀, Sangwonsa Temple, Mt. Chiaksan, Seongnam-ri, Sinlim-myeon, Wonju, 26. v. 2009 (HS. Lee, QIA). Gyeonggi-do: 3 ♀, KwangNung, Pochon-gun, 18. v. 1992 (O. Tadauchi, ELKU). [CHINA] 1 ♂, Mandschurei, Gaolinzsa, 10-14. ix. 1953 (V. Alin, MNHAH, illustrated in Figs 8 , 21 ).

Distribution.

Russian Far East, northeastern China, Korean Peninsula (north, south = new record).

Published records for Korean Peninsula.

North Korea: Ebmer (1996).

Flight period.

Female: April to September. Male: July to September.

Flower records.

This species visited the following 9 species in 7 families listed as follows. Apiaceae : Angelica anomala . Asteraceae : Cirsium japonicum , Taraxacum sp. Brassicaceae : Sisymbrium luteum . Caprifoliaceae : Viburnum erosum . Fabaceae : Lespedeza sp. Oleaceae : Ligustrum japonicum . Rosaceae : Crataegus sp., Neillia incise .

Habitat in South Korea.

One of the collecting sites (Mt. Gariwangsan) for this species is shown in Fig. 18 . This site is mountain covered by both broad-leaved and coniferous forests. This species was collected on the flower of Angelica anomala ( Fig. 17 ) at the forest edge.

Redescription.

Female. Coloration. Body black except for the following parts: flagellum dark brown or brown ventrally; tegula blackish brown, translucent; tibial spur yellow; wings transparent and dim, veins and stigma brown or blackish brown.

Pubescence. Body seta whitish to pale yellowish. Head with sparse erect setae. Mesosoma with sparse elect fine branched setae, and pronotum with thin tomentum marginally; hind trochanter to tibia with dense plumose or fine branched setae, forming scopa. T1 basally with sparse erect setae. T2-T3 basolateral with thin whitish appressed setae, forming basal setal bands. Discs of T2-T4 with sparse, short setae. Discs on S2-S5 with sparse semi-erect setae.

Measurements (n = 5): BL = 13.14-15.86 (14.06 ± 1.09), WL = 11.43-13.00 (12.29 ± 0.74); HL = 3.25-3.50 (3.32 ± 0.12), HW = 3.80-4.40 (4.03 ± 0.24), IOD = 0.48-0.55 (0.52 ± 0.03), OOD = 0.80-1.00 (0.88 ± 0.08), OCD = 1.15-1.40 (1.25 ± 0.01), UOD = 2.55-2.90 (2.66 ± 0.16), MOD = 2.90-3.35 (3.04 ± 0.19), LOD = 2.93-3.38 (3.08 ± 0.18), IAD = 0.40-0.55 (0.47 ± 0.06), AOD = 0.95-1.15 (1.01 ± 0.08), CAL = 0.42-0.48 (0.46 ± 0.03), CPL = 0.61-0.66 (0.64 ± 0.02), EL = 2.00-2.25 (2.09 ± 0.10), EW = 0.75-0.85 (0.79 ± 0.04), GW = 1.20-1.48 (1.28 ± 0.12), SPL = 1.48-1.77 (1.60 ± 0.11), F1L = 0.23 (0.23 ± 0.00), F2L = 0.23 (0.23 ± 0.00), F3L = 0.23 (0.23 ± 0.00), F2W = 0.23-0.26 (0.23 ± 0.01); MsW = 3.55-3.80 (3.71 ± 0.12), SCL = 0.43-0.48 (0.45 ± 0.02), MNL = 0.23-0.28 (0.25 ± 0.02), MPL = 0.25-0.28 (0.26 ± 0.01); MtW = 4.20-4.75 (4.44 ± 0.22).

Structure and sculpture. Head wider than long; HW:HL = 1:0.82. Vertex flat in frontal view. MOD:UOD:LOD = 1:0.88:1.01. IOD:OOD:OCD = 1:1.69:2.40. IAD:AOD = 1:2.15. PP between ocellocular area and vertex moderately dense, IS smooth (IS = 1-3d). Paraocular area with moderately dense PP, IS smooth; PP on lower paraocular area sparser than on upper ones (IS = 1-1.5d in upper, = 1-3d in lower areas). Frons with dense PP, IS smooth (IS = 0.5-1.5d). Supraclypeus slightly convex, with PP becoming gradually sparse lower part, IS smooth. CPL:CAL = 1:0.72. Clypeus flat and inclined, with sparse PP, IS smooth (IS = 1.5-5d). EW:GW = 1:1.61. Genal area with moderately dense PP, IS smooth (IS = 1-3d). Malar space linear. Occiput not carinate. Postgena slanting, with sparse PP and weak tessellation. Hypostomal carinae nearly parallel. Mandible long, approximately 1.3 × as long as EL. Labrum ( Fig. 7 ): basal area approximately 2 × wider than long; distal process approximately 1.4 × as long as basal area, triangular, and without lateral projection; distal keel narrow, pointed apically. Antenna short, not reaching metasoma. F1-F3L:F2W = 1:1.00:1.00:1.03.

Dorsolateral angle of pronotum obtuse; lateral surface with oblique ridges on anterior half ( Fig. 9 ); lateral ridge absent; lateral lobe rounded. Mesoscutum ( Fig. 10 ) with dense PP, but PP on disc sparser than laterally (IS = 1-2d on disc, = 0.5-1d in the remainder); mesoscutum anteriorly shallowly depressed along middle parapsidal line; parapsidal line a narrow groove. Mesoscutellum similarly sculptured as mesoscutum. Metanotum rugulose. Mesepisternum ( Fig. 11 ) reticulate-rugulae over entire surface. SCL:MNL:MPL = 1:0.56:0.59. Propodeum: metapostnotum ( Fig. 12 ) with longitudinal ridges that do not attain posterior margin, posteriorly weakly rugulose, posterior margin not carinate; dorsolateral slope with oblique ridges; lateral and posterior surfaces rugulose; posterior surface with lateral carinae on lower half, without oblique carina. Coxae of usual shape, without tubercle. Fore trochanter narrow, longer than wide. Basitibial plate of hind leg carinate marginally. Inner hind tibial spur serrate ( Fig. 19 ). Fore wing with three submarginal cell.

T 1-T3 as in Fig. 13 : disc of T1 medially with sparse fine PP, apically with moderately dense fine PP, and without lineolation over entire surface; discs of T2-T3 basally with sparse fine PP, the remaining parts sculptured similarly to T1. Disc of T4 with moderately dense PP and very weak tessellation over entire surface. Metasomal sterna not modified.

Male. Coloration. Body black except the following parts: clypeus slightly dark yellow on lower half; flagellum dark brown ventrally; pronotum anteriorly yellowish brown; tegula blackish brown, translucent; fore tibia reddish brown on outer surface; tibial spur yellow; wings transparent, veins and stigma pale brown.

Pubescence. Body setae whitish to pale yellowish. Head with sparse erect setae except for lower paraocular area that is covered with thin tomentum. Mesosoma with sparse elect fine branched setae, and pronotum with thin tomentum marginally. T1 basally with sparse erect setae. T2-T3 basolateral with thin whitish appressed setae. S2-S5 as in Fig. 16 : S2 apicolaterally with sparse semi-erect fine branched setae; S3-S5 laterally with erect fine branched seta tufts; setae on S5 longer than on other sterna.

Measurements (n = 1, unit mm): BL = 17.14, WL = 13.14; HL = 3.70, HW = 3.75, IOD = 0.55, OOD = 0.85, OCD = 1.30, UOD = 2.50, MOD = 2.70, LOD = 2.25, IAD = 0.5, AOD = 0.7. CAL = 0.40, CPL = 0.94, EL = 2.40, EW = 0.85, GW = 1.25, SPL = 0.81, F1L = 0.26, F2L = 0.42, F3L = 0.42, F2W = 0.26; MsW = 3.70, SCL = 0.80, MNL = 0.50, MPL = 0.63; MtW = 3.85.

Structure and sculpture. Head as long as wide; HW:HL = 1:0.99. Vertex flat in frontal view. MOD:UOD:LOD = 1:0.93:0.83. IOD:OOD:OCD = 1:1.55:2.36. IAD:AOD = 1:1.4. PP between ocellocular area and vertex moderately dense, IS smooth (IS = 1-3d). Paraocular area with dense PP, IS smooth; PP on lower paraocular area sparser than on upper one (IS ≤ d in upper part, IS ≤ d or 0.5-2d in lower part). Frons with reticulate PP. Supraclypeus weakly convex with dense PP, IS smooth (IS = 1-1.5d). CPL:CAL = 1:0.43. Clypeus with dense PP, IS smooth (IS = 0.5-1.5d). EW:GW = 1:1.47. Malar space short, 0.19 × as long as mandible at base. Genal area sparsely punctuate, IS = 1-8d. Occiput not carinate. Postgena slanting, with sparse PP and weak tessellation. Hypostomal carinae nearly parallel. Mandible edentate (without subapical tooth) and robust. Labrum without distal process. Antenna short, not reaching metasoma. F1-F3L:F2W = 1:1.63:1.63:1.00, F2L:F2W = 1:0.62; flagellum nearly flattened ventrally.

Dorsolateral angle of pronotum obtuse; lateral surface with oblique ridges on anterior half; lateral ridge absent; lateral lobe rounded. Tegula ovoid, with shallow and moderately dense PP (IS = 1-2d) on anterior half. Mesoscutum and mesoscutellum with dense PP over entire surface, IS smooth (IS = 1-1.5d); mesoscutum anteriorly deeply depressed along middle parapsidal line; parapsidal line a narrow groove. Metanotum and mesepisternum reticulate-rugulose over entire surface. SCL:MNL:MPL = 1:0.63:0.78. Propodeum: metapostnotum with irregular sinuate ridges that not attain posterior margin, posteriorly weakly rugulose, posterior margin not carinate; dorsolateral slope and lateral surface reticulate-rugulose; posterior surface with lateral carinae on lower half, without oblique carina, and with many oblique ridges over entire surface. Fore trochanter rounded and narrow, longer than wide. Hind tibia without basitibial plate. Hind basitarsus slender, approximately 6 × as long as wide. Inner hind tibial spur finely serrate. Fore wing with three submarginal cell.

T 1-T4 ( Fig. 14 in T1-T3): disc of T1 medially and apically with fine PP that become gradually denser toward apical part, without lineolation; T2-T4 similarly punctuate as T1 nearly over entire surface, IS smooth. S7-S8 ( Fig. 21 ): S7 with short and triangular median process; median process of S8 triangular, with sparse simple setae.

Genitalia ( Figs 22-25 ): gonobase flat at the bottom, ventral arms not connected with each other at upper ends; gonocoxite smooth, and inner dorsal margin angulate at the approximately basal one-third; gonostylus located at ventral side of gonocoxite, and with sparse short setae; ventral retrorse lobe slender, not reaching gonobase, rounded apically, and with dense short setae.

Figures

Figures 1 - 6. Lasioglossum (Acanthalictus) dybowskii (Radoszkowski). 1 - 2 lateral habitus 3 - 4 head in frontal view 5 clypeus in lateral view 6 teeth of mandible. 1, 3, 6 female; 2, 4, 5 male.

Figures 13 - 18. Lasioglossum (Acanthalictus) dybowskii (Radoszkowski). 13 - 14 1 st to 3 rd metasomal terga 15 2 nd metasomal sterna in lateral view (arrow indicate) 16 setae on metasomal sterna 17 female on the flower of Angelica anomala 18 collecting site at Mt. Gariwangsan, South Korea. 13, 17 female; 14 - 16 male.

Figures 19 - 25. Lasioglossum (Acanthalictus) dybowskii (Radoszkowski). 19 inner hind tibial spur 20 6 th metasomal sternum 21 7 - 8 th metasomal sterna 22 genitalia in ventral view 23 genitalia in dorsal view 24 genitalia in lateral view 25 ventral retrorse lobe of genitalia, 19 female; 20 - 25 male. Scale bars: 19, 25 = 0.25 mm; 20 - 24 = 0.5 mm.

Figures 7 - 12. Lasioglossum (Acanthalictus) dybowskii (Radoszkowski). 7 - 8 labrum 9 lateral surface of pronotum 10 mesoscutum 11 mesepisternum 12 metapostnotum. 7, 9 - 12 female; 8 male.