Symmorphus yamanei Kim, 2017

Kim, Jeong-Kyu, 2017, Descriptions of three new species of the genus Symmorphus Wesmael, 1836 (Hymenoptera: Vespidae: Eumeninae) from South Korea, with an updated revised key to Far Eastern species, Zootaxa 4350 (2) : -

Symmorphus yamanei Kim sp. nov.

Type specimen. Holotype. ♂, pinned. Original label: “Mt. Seolaksan, Yangyang-gun, Gangwon-do, Korea, 24.v.1982, JN Kim” [white printed label]. “Holotype / Symmorphus / yamanei / Kim / sp. n. / 2017” [red handwritten label].

Diagnosis (male only). Apical emargination of clypeus deep, nearly semi-circular ( Figs. 4C and 12B ); tyloides not keeled, lower faces of flagellomeres 8–11 broadly and weakly raised, and raised areas on flagellomere 7 narrow and short (somewhat evanescent); mesosoma only with dense short setae of almost uniform length; mesepimeron areolate; propodeal submedian carina well-developed, though irregularly doubled dorsally on posterior face of propodeum and not completely closed; metasomal tergum 1 with basal transverse carina weakly developed dorsally, and obsoletely dull laterally; postcarinal area of metasomal tergum 1 medially neither impressed nor furrowed, only with weak median longitudinal sulcus in apical half of postcarinal area; lateral extensions of basal carina of sternum 1 low, short (not reaching end of basal stalk) and narrow (for more detail, refer to Remarks below); dorsomedian portion of postcarinal area of tergum 1 faintly foveate-reticulate ( Fig. 10F ).

Description. Male. Structure. Body length ca. 10.5 mm, forewing length ca. 7.3 mm. Inter-antennal area dully tuberculate, but not forming a longitudinal carina. Clypeus almost as long as broad, ca. 1.1 × as broad as long, with semi-elliptic apicomedian margin (tooth interval ca. 3.6 as long as depth of emargination) and apical teeth spaced by almost inter-antennal distance ( Fig. 12B ). Tyloides not keeled, lower faces of flagellomeres 8–11 broadly and weakly raised, but flagellomere 7 narrowly and shortly raised (almost evanescent); apical flagellomere short and small, ca. 0.8 × as long as broad at base, almost three quarters of preceding segment in ventral length ( Fig. 4B ). Occipital carina well developed, complete, and more strongly raised in lateral side. Pronotal carina well developed except for dorsomedian interruption. Humeral angle produced, acutely angled in dorsal view. Notaulices well developed without interruption. Epicnemial carina faint, at most border between epicnemium and ventral mesepisternum discerned with marginal puncture row in the latter. Propodeal superior shelf broad, ca. 2.2 × transscutal sulcus length. Median propodeal pit round in shape, with low, very short, basal ridge at bottom. Propodeal submedian carina well developed, but irregular and doubled dorsally, not completely closed as single continuous carina. Propodeal valvula completely merging distally into submarginal carina, not produced posteriorly. Metasomal tergum 1 with transverse carina weakly raised throughout, very obsolete laterally; postcarinal area ca. 0.61 × as long as broad at apex; lateral margins somewhat divergent posteriad in dorsal, width at transverse carina ca. 0.73 apical width; postcarinal area medially hardly impressed, with a median longitudinal sulcus in its apical half. Basal carina of metasomal sternum 1 well developed, broadly V-shaped, its lateral extensions low and narrow (weaker than lateral oblique ridges); median longitudinal and lateral oblique ridges well developed, and area between them with short carinate longitudinal ridges ( Fig. 4D ).

Sculpture. Frons largely punctuate-reticulate. Inter-ocellar area and median portion of vertex punctatepunctulate with major punctures sparse, but lateral portion of vertex densely punctate. Gena punctate-puncticulate, with major punctures moderate to dense. Clypeus densely punctate, but smooth in its apical one-fourth. Upper marginal portion of anterior vertical face of pronotum obscurely imbricate; pronotal dorsum anteriorly densely punctate and weakly reticulate, punctate-puncticulate posteriorly, with major punctures various in size and irregular in distribution; lateral side striate to carinate. Mesoscutum coarsely punctate-punctulate, with major punctures various in size and irregular in distribution. Epicnemium puncticulate; both dorsal and ventral mesepisterna punctate-puncticulate, with major punctures irregular in distribution (moderate to dense); mesepimeron areolate to punctuate-reticulate (especially in posterior portion). Mesoscutellum punctatepuncticulate, with major punctures sparse; medially weakly impressed and filled with punctures almost as large as nearby punctures. Entire dorsum and upper half of posterior sloping face of metanotum foveate-reticulate; lower half of posterior sloping face puncticulate. Metapleuron striate. Dorsum of propodeum and upper half of propodeal side foveate-reticulate, foveae in the latter somewhat flattened; lower half of propodeal side rugose; posterior face shiny, puncticulate. Precarinal area of metasomal tergum 1 imbricate; dorsum of postcarinal area foveate-reticulate to areolate partially, but fovea very shallow and reticulae faint; lateral side foveate-reticulate.

Coloration. Body largely black, following parts/markings yellow: clypeus except for basal and lateral margins, mandible except for apical one-third and lower basal portion, small postocular dot, small spot on dorsal mesepisternum, outer faces of fore and mid tibiae, hind tibia basally, all tarsomeres, apical bands on metasomal terga 1–2, tergum 4 and sternum 2. Almost entire apical flagellomere and lower faces of flagellomeres 8–10 yellowish brown.

Etymology. Named in honor of Dr Yamane Seiki (emeritus professor of Kagoshima University, Kagoshima, Japan).

Figures

FIGURE 4. Symmorphus yamanei Kim sp. nov. A, Habitus in dorsal view, holotype male. B, apical four segments of antennal flagellum, holotype male. C, Head in frontal view, holotype male. D, Metasomal sternum 1, holotype male.

FIGURE 10. Metasomal tergum 1 in dorsal view. A, Symmorphus lucens (Kostylev). B, S. carinatus Yamane, showing a median longitudinal ridge on precarinal area. C, S. apiciornatus (Cameron). D, S. bifasciatus (Linnaeus). E, S. cliens Giordani Soika. F, S. yamanei Kim sp. nov.

FIGURE 12. Metasomal tergum 1 in dorsal view. A, Symmorphus fuscipes (Herrich-Schaeffer). B, S. kurzenkoi Kim sp. nov.