Pediobius sasae, Hansson, Christer, 2006

Hansson, Christer, 2006, Pediobius sasae (Hymenoptera: Eulophidae), a new species from galls on dwarf bamboo (Sasa nipponica) in Japan, Zootaxa 1249, pp. 37-45 : 38-45

publication ID

https://doi.org/ 10.5281/zenodo.172985

DOI

https://doi.org/10.5281/zenodo.6494784

persistent identifier

https://treatment.plazi.org/id/038B87FF-B465-0133-FEEF-78E5FD1CBE43

treatment provided by

Plazi

scientific name

Pediobius sasae
status

sp. nov.

Pediobius sasae sp. nov.

Figs 1–15 View FIGURES 1 – 2 View FIGURE 3 View FIGURES 4 – 10 View FIGURES 11 – 13 View FIGURES 14 – 15

Diagnosis

Upper half of occiput strongly concave ( Fig. 6 View FIGURES 4 – 10 ); occipital margin strongly carinate, especially strong in the dorsolateral corners of the occiput ( Fig. 7 View FIGURES 4 – 10 ); transverse pronotal carina weakly developed or absent ( Fig. 11 View FIGURES 11 – 13 ).

Description

Length of body female 2.5–3.4 mm, male 2.0– 2.7 mm.

Female ( Figs 1–2 View FIGURES 1 – 2 ), colour: Scape golden­green, pedicel and flagellomeres 1–3 dark brown with a metallic tinge, flagellomeres 4–5 pale brown, or all flagellomeres dark brown with a metallic tinge. Frons golden­red with golden­green spots, to entirely goldengreen; lower face and malar space metallic purple. Vertex dark golden­purple. Mesoscutum golden­green, sometimes with a metallic blue tinge. Scutellum and axillae dark golden­purple. Dorsellum and propodeum golden­green, sometimes with a metallic blue tinge. Coxae, femora and tibiae golden­green with a metallic blue tinge; tarsal segments 1–3 yellowish­white, segment 4 dark brown. Wings hyaline. Petiole dark golden­purple. Gaster with first tergite golden­green, remaining tergites dark goldenpurple.

Antenna as in Fig. 15 View FIGURES 14 – 15 , i.e. with ratios of the length of scape/pedicel/flagellomeres 1 to 5: 3.9:1.0:1.8:1.6:1.4:1.1:1.2. Frons with weak reticulation, shiny; frontal suture V­shaped; antennal scrobes as distinct narrow grooves, joining frontal suture separately. Vertex with strong reticulation. Malar sulcus absent or indicated by fine and small meshed reticulation. Occipital margin with a strong carina. Eyes with scattered short hairs. Ratios of height of head/width of head 0.71:1; length of head/width of head 0.52:1; height of eye/malar space/ width of mouth opening 6.9:1.0:4.3; distances between posterior ocelli/between posterior ocelli and eye/between posterior ocelli and occipital margin 8.0:4.0:1.0; width of head/ width of thorax across shoulders 1.3:1.

Thoracic dorsum strongly convex. Pronotum well developed, with a weakly developed transverse carina close to posterior margin, carina absent in some specimens. Mesoscutum with strong reticulation; notaular depressions indistinct, entirely reticulate. With a short but wide hole between midlobe of mesoscutum and scutellum. Scutellum strongly convex with strong reticulation throughout. Dorsellum flat and smooth, with two shallow foveae anterolaterally. Propodeum smooth and shiny; submedian carinae closest medially, diverging posteriorly and anteriorly from this point; propodeal callus with two setae. Fore wing speculum closed below. Ratios of length of fore wing/length of marginal vein/height of fore wing 1.9:1.3:1.0; length of postmarginal vein/length of stigmal vein 1.5:1.

Petiole 0.83X as long as wide, with strong small meshed reticulation. Gaster elongate with posterior part pointed; first tergite smooth and shiny, remaining tergites with fine reticulation and with posterior margin smooth and shiny. Ratio of length of mesosoma/ length of gaster 0.58–0.61:1.

Male ( Fig. 3 View FIGURE 3 ), colour: Scape metallic bluish­green; flagellum with flagellomere 5 slightly paler than 1–4, all flagellomeres with metallic tinges. Frons golden­green with metallic blue tinges. Scutellum entirely dark golden­purple as in female, or with median part dark golden­purple and with sides and posterior part metallic bluish­green. Mesoscutum, dorsellum and propodeum metallic bluish­green. Gaster with first tergite metallic bluish­green with purple tinges. Colour otherwise as in female.

Antenna as in Fig. 14 View FIGURES 14 – 15 , i.e. with ratios of the length of scape/pedicel/flagellomeres 1 to 5: 3.5:1.0:2.6:2.5:2.6:2.5:3.0. Ratios of height of head/width of head 0.70:1; length of head/width of head 0.43:1; height of eye/malar space/width of mouth opening 2.6:1.0:1.8; distances between posterior ocelli/between posterior ocelli and eye/between posterior ocelli and occipital margin 9.0:5.0:1.0; width of head/width of thorax across shoulders 1.3:1. Head otherwise as in female.

Ratios of length of fore wing/length of marginal vein/height of fore wing 1.8:1.1:1.0; length of postmarginal vein/length of stigmal vein 1.5:1. Mesosoma otherwise as in female.

Petiole 1.3–1.7X as long as wide. Genitalia as in most species of subfamily Entedoninae ( Hansson 1996) ( Fig. 10 View FIGURES 4 – 10 ), i.e. with digitus as long as wide, two equally large digital spines, volsellar setae short and relatively slender, and parameres only slightly protruding. Ratio of length of mesosoma/length of gaster 1.2–1.5:1. Petiole and gaster otherwise as in female.

Description

Length of body female 2.5–3.4 mm, male 2.0– 2.7 mm.

Female ( Figs 1–2 View FIGURES 1 – 2 ), colour: Scape golden­green, pedicel and flagellomeres 1–3 dark brown with a metallic tinge, flagellomeres 4–5 pale brown, or all flagellomeres dark brown with a metallic tinge. Frons golden­red with golden­green spots, to entirely goldengreen; lower face and malar space metallic purple. Vertex dark golden­purple. Mesoscutum golden­green, sometimes with a metallic blue tinge. Scutellum and axillae dark golden­purple. Dorsellum and propodeum golden­green, sometimes with a metallic blue tinge. Coxae, femora and tibiae golden­green with a metallic blue tinge; tarsal segments 1–3 yellowish­white, segment 4 dark brown. Wings hyaline. Petiole dark golden­purple. Gaster with first tergite golden­green, remaining tergites dark goldenpurple.

Antenna as in Fig. 15 View FIGURES 14 – 15 , i.e. with ratios of the length of scape/pedicel/flagellomeres 1 to 5: 3.9:1.0:1.8:1.6:1.4:1.1:1.2. Frons with weak reticulation, shiny; frontal suture V­shaped; antennal scrobes as distinct narrow grooves, joining frontal suture separately. Vertex with strong reticulation. Malar sulcus absent or indicated by fine and small meshed reticulation. Occipital margin with a strong carina. Eyes with scattered short hairs. Ratios of height of head/width of head 0.71:1; length of head/width of head 0.52:1; height of eye/malar space/ width of mouth opening 6.9:1.0:4.3; distances between posterior ocelli/between posterior ocelli and eye/between posterior ocelli and occipital margin 8.0:4.0:1.0; width of head/ width of thorax across shoulders 1.3:1.

Thoracic dorsum strongly convex. Pronotum well developed, with a weakly developed transverse carina close to posterior margin, carina absent in some specimens. Mesoscutum with strong reticulation; notaular depressions indistinct, entirely reticulate. With a short but wide hole between midlobe of mesoscutum and scutellum. Scutellum strongly convex with strong reticulation throughout. Dorsellum flat and smooth, with two shallow foveae anterolaterally. Propodeum smooth and shiny; submedian carinae closest medially, diverging posteriorly and anteriorly from this point; propodeal callus with two setae. Fore wing speculum closed below. Ratios of length of fore wing/length of marginal vein/height of fore wing 1.9:1.3:1.0; length of postmarginal vein/length of stigmal vein 1.5:1.

Petiole 0.83X as long as wide, with strong small meshed reticulation. Gaster elongate with posterior part pointed; first tergite smooth and shiny, remaining tergites with fine reticulation and with posterior margin smooth and shiny. Ratio of length of mesosoma/ length of gaster 0.58–0.61:1.

Male ( Fig. 3 View FIGURE 3 ), colour: Scape metallic bluish­green; flagellum with flagellomere 5 slightly paler than 1–4, all flagellomeres with metallic tinges. Frons golden­green with metallic blue tinges. Scutellum entirely dark golden­purple as in female, or with median part dark golden­purple and with sides and posterior part metallic bluish­green. Mesoscutum, dorsellum and propodeum metallic bluish­green. Gaster with first tergite metallic bluish­green with purple tinges. Colour otherwise as in female.

Antenna as in Fig. 14 View FIGURES 14 – 15 , i.e. with ratios of the length of scape/pedicel/flagellomeres 1 to 5: 3.5:1.0:2.6:2.5:2.6:2.5:3.0. Ratios of height of head/width of head 0.70:1; length of head/width of head 0.43:1; height of eye/malar space/width of mouth opening 2.6:1.0:1.8; distances between posterior ocelli/between posterior ocelli and eye/between posterior ocelli and occipital margin 9.0:5.0:1.0; width of head/width of thorax across shoulders 1.3:1. Head otherwise as in female.

Ratios of length of fore wing/length of marginal vein/height of fore wing 1.8:1.1:1.0; length of postmarginal vein/length of stigmal vein 1.5:1. Mesosoma otherwise as in female.

Petiole 1.3–1.7X as long as wide. Genitalia as in most species of subfamily Entedoninae ( Hansson 1996) ( Fig. 10 View FIGURES 4 – 10 ), i.e. with digitus as long as wide, two equally large digital spines, volsellar setae short and relatively slender, and parameres only slightly protruding. Ratio of length of mesosoma/length of gaster 1.2–1.5:1. Petiole and gaster otherwise as in female.

volsellar setae.

Biology

Parasitoid of an unidentified gall midge belonging to the tribe Oligotrophini ( Diptera : Cecidomyiidae ) forming galls on dwarf bamboo ( Sasa nipponica Makino & Shibata ). Possibly also a hyperparasitoid of Torymus sp. ( Hymenoptera : Torymidae ).

Distribution

Japan (Nara Prefecture, Mt. Ôdaigahara).

Material examined

Holotype female labeled “ Japan: Nara Prefecture, Mt. Ôdaigahara, 34°11’N, 136°06’E, 1540 m, 24.iv.2003, A. Ueda” (Lund University Zoology Museum, Sweden). Paratypes: 79 females and 50 males with same label data as holotype (Australian National Insect Collection, Canberra; Canadian National Collection of Insects, Ottawa; collection of Christer Hansson; Hokkaido University Museum, Japan; Lund University Zoology Museum, Sweden; Natural History Museum, London, England; Smithsonian National Museum of Natural History, Washington, D.C., U.S.A.; Texas A&M University collection, College Station, U.S.A.; University of California, Riverside, U.S.A.).

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Hymenoptera

Family

Eulophidae

Genus

Pediobius

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