Pseudisobrachium koreana Lim and S. Lee, 2011

Lim, Jongok, Terayama, Mamoru, Koh, Sanghyun, Lee, Jongwook & Lee, Seunghwan, 2011, A taxonomic review of the subfamily Pristocerinae (Hymenoptera: Chrysidoidea: Bethylidae) from Korea with descriptions of two new species, Journal of Natural History 45 (7 - 8), pp. 435-460 : 454-458

Pseudisobrachium koreana Lim and S. Lee sp. nov.

( Figure 7A–J , Table 4)

Specimens examined

Holotype. [Korea] ( CALS SNU): male, Kwanak Arboretum , Manan-gu, Anyang-si, GG, South Korea, 15 September–25 October 2007, MT, Jongok Lim leg.

Paratypes. [ Korea] ( CALS SNU): 9 males, same collection data as holotype, MT, Jongok Lim leg. ; 3 males, ditto, 31 August–14 September 2007, MT, Jongok Lim leg. ; 1 male, Donggye-dong , Jeju-si, JJ, South Korea, 20–27 August 2005, MT, Changhoon Shin leg. ; 1♂, ditto, 10–16 September 2005, MT, Changhoon Shin leg. ; 1 male, Donam-ro , Banpo-myeon, Gongju-si, CN, South Korea, 6–13 August 2005, MT, Yeontae Kim leg. ; 1 male, ditto, 8–14 August 2007, MT, Yeontae Kim ; 1 male, Jinae-ri , Dong-myeon, Chuncheon-si, GW, South Korea, 20–27 August 2005, MT, Seokjoon Jang leg. ; 1 male, Goyang-dong , Deokyang-gu, Goyang-si, GG, South Korea, 7 August–6 October 2007, MT, Jongok Lim leg.

Description (male holotype)

Colour. Body testaceous to black. Head: black except mandible dark testaceous; antenna dark testaceous except basal four-fifths of scape black. Mesosoma : pronotum and mesonotum black with pronotal collar dark testaceous; forewing hyaline, wing veins testaceous; legs yellow except coxa, trochanter and femora dark testaceous. Metasoma: testaceous except posterior-lateral surface yellow.

Morphology. Body ( Figure 7A ) 5.07 mm long.

Head ( Figures 7B, C, H ) 1.0 × as long as wide with almost straight posterior margin and postero-lateral margin with rounded angle in full face view; frons and vertex micro-reticulate with dense shallow and large punctures, separated from each other by 0.5–2.0 × their diameter (0.03–0.04 mm); mandible with five teeth, upper three teeth very small and lowest tooth most sharp, developed ( Figure 7H ); anterior margin of clypeus broadly truncated with obtuse lateral margin, median carina present ( Figure 7C ); from scape to flagellomere III in ratio of 3.8: 1.0: 1.8: 1.7: 1.6 in length; from scape to flagellomere III and XIII 3.8, 1.1, 2.0, 1.9, 1.7 and 2.7 × as long as wide respectively; compound eye 0.42 mm long with dense hairs, LE 1.4 × as wide as OOL, WF 2.3 × as wide as WOT, ocelli forming almost right angle, POL 1.2 × as wide as AOL, OOL 1.1 × as wide as WOT ( Figure 7B ).

Mesosoma ( Figure 7E, I ): pronotum 0.6 × as long as wide, micro-reticulate with relatively large and shallow punctures; mesoscutum with shallow punctures and scutum polished with few punctures; notaulix weakly developed on anterior half of mesoscutum, scutellum with anterior transverse groove, about 5.0 × as wide as long ( Figure 7E ); propodeum long, 1.6 × as long as wide with parallel lateral margin in dorsal view; median discal carina, lateral and sublateral carinae weakly developed, median discal carina reaches anterior half of propodeum, median area with longitudinal irregular rugae, sublateral area with weak irregular rugae, median area with U-shaped polished area ( Figure 7I ); wings with LFW 3.52 mm long, pterostigma short, about 2.0 × as long as wide, metacarpus absent, discoidal vein arising nearby from transverse median vein ( Figure 7J ).

Metasoma ( Figure 7F ): petiolate, shining with dense hairs posteriorly and relatively flat in lateral view.

Genitalia ( Figures 7D, G ): paramere long, divided into two lobes distally, distal margin of paramere narrowly rounded, paramere and volsella with long hairs; aedeagus elongate, bottle-shaped; basal margin narrowly rounded; distal margin of digitus well sclerotized ( Figure 7D ); hypopygium rounded and densely haired, anterior margin well-sclerotized with three projections ( Figure 7G ).

Measurements. See Table 4 for biometric measurement data.

Distribution

South Korea (CN, GW, GG, JJ).

Etymology

The specific name is derived from Korea, the locality of the type specimens.

Diagnosis

In general external morphology, this species is similar to P. ryukyuanum Terayama, 1999 from Japan. However, the new species is distinguished from the latter by its head having a rounded posterior-lateral corner (distinctly angulated corner in P. ryukyuanum ); the flagellomere I 1.8 × as long as the pedicel (3.0 × as long in P. ryukyuanum ); the coxa, trochanters and femora dark brown (legs entirely yellow in P. ryukyuanum ); the propodeum 1.6 × as long as wide (1.4 × as long as wide in P. ryukyuanum ) and the propodeum without transverse rugae on median area (with transverse rugae on median area in P. ryukyuanum ).

Key to species of Pristocerinae in Korea

1. Apterous; tegulae and ocelli absent (female).......................................................... Pristocera formosana Miwa and Sonan (female) Alate; tegulae and ocelli present (male).................................. 2

2. Big and robust (TL more than 7.8 mm); hypopygium deeply divided into two lobes in dorsal view.......... Pristocera formosana Miwa and Sonan (male) Small and slender (TL less than 5.2 mm); hypopygium not divided into two lobes in dorsal view.................................................... 3

3. Anterior margin of clypeus trapezoidal and truncate anteriorly; eye covered with dense hairs; genitalia with paramere deeply divided into two lobes in lateral view.............. Pseudisobrachium koreana Lim and S. Lee sp. nov. Anterior margin of clypeus various but not trapezoidal; eye glabrous, or only scattered with short hairs; genitalia with parameres not deeply divided into two lobes in lateral view................................................ 4

4. Metacarpus absent; ocelli forming a flat triangle and situated near the occipital margin...... Parascleroderma tetradentica Lim and S. Lee sp. nov. Metacarpus present; ocelli forming a right angle and situated far from the occipital margin........................................................ 5

5. Basal tooth of mandible curved inwardly; terminal segment of antenna thin, more than 3 × as long as wide with acute tip......................................................................... Acrepyris minutus (Yasumatsu) Basal tooth of mandible not curved inwardly; terminal segment of antenna thick, less than 2.5 × as long as wide with obtuse tip...................... 6

6. Clypeus with round angle broadly; head micro-reticulate with dense shallow punctures................................. Apenesia okinawensis Terayama Clypeus with triangle anteriorly; head not micro-reticulate with smooth surface........................................ Apenesia elegans Terayama

Figures

Figure 7. Pseudisobrachium koreana Lim and S. Lee sp. nov. (A) whole body; (B) head; (C) clypeus; (D) genitalia; (E) pronotum and mesonotum; (F) metasoma; (G) subgenital plate in ventral view; (H) mandible; (I) propodeum; (J) right forewing (scale bar 0.10 mm for (C), (D), (G) and (H); 0.20 mm for (B9 and (I); 0.50 mm for (E), (F) and (J); 1.00 mm for (A)).