Asecodes lineophagum
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Ordo: Hymenoptera
Familia: Eulophidae
Genus: Asecodes
Name
Asecodes lineophagum Hansson & Hambäck, 2013 sp. n. – Wikispecies link – ZooBank link – Pensoft Profile
Diagnosis
Forewing (Fig. 2) with speculum open posteriorly (i.e. setal line absent), bare just behind marginal vein and otherwise relatively sparsely setose; propodeal callus with 3–5 setae (Fig. 22).
Description
FEMALE. Length 1.0–1.8 mm.
Antenna dark brown (Fig. 10). Frons below frontal suture metallic purple with upper-lateral corners close to eyes and frontal suture golden-green (Fig. 26), above suture golden green. Vertex metallic purple inside ocellar triangle, golden-green outside triangle. Mesoscutum black with metallic purple tinges (Fig. 16). Scutellum metallic bluish-green (Fig. 16). Axillae black with metallic purple tinges (Fig. 16). Dorsellum metallic bluish-green (Fig. 16). Propodeum metallic bluish-green (Fig. 16). Coxae, femora and tibiae dark brown to black, and shiny (as in Fig. 1); fore tarsus dark brown, mid and hind tarsi with tarsomeres 1–3 yellowish-white, tarsomere 4 dark brown. Forewing hyaline (Fig. 2), wing interference pattern as in Fig. 3. Petiole dark brown to black. Gaster with 1st tergite metallic bluish-green, remaining tergites dark brown to black with metallic purple tinges.
Antenna as in Fig. 10. Frons below frontal suture with weak reticulation, above suture smooth; antennal scrobes join on frontal suture. Vertex with very weak reticulation inside ocellar triangle, smooth outside triangle.
Mesoscutum with weak reticulation (Fig. 17). Scutellum with very weak reticulation in anterior 2/3 (Fig. 17), posterior 1/3 smooth. Axillae with weak reticulation (Fig. 17). Dorsellum slightly convex and smooth (Fig. 17). Propodeum with a wide groove along anterior margin (Fig. 17), with weak reticulation; propodeal callus with 3–5 setae. Forewing (Fig. 2) bare just behind marginal vein, speculum open, setation relatively sparse, and with 5–9 admarginal setae.
Petiole as a short, transverse, narrow stripe. Gaster circular.
Ratios. Height of eye/malar space/width of mouth = 2.6/1.0/1.8; shortest distance between posterior ocelli/posterior ocellus and eye/posterior ocellus and occipital margin = 10.4/5.4/1.0; width of head/width of mesosoma = 1.1; length of forewing/length of marginal vein/height of forewing = 2.4/1.0/1.0; length of postmarginal vein/length of stigmal vein= 0.6; length of mesosoma/length of gaster = 1.0.
MALE. Length 0.9–1.4 mm.
Very similar to female except antenna (Fig. 13) with scape wider, flagellomeres longer and more slender, and apical two flagellomeres distinctly separated.
Ratios. Height of eye/malar space/width of mouth = 2.1/1.0/1.6; length of mesosoma/length of gaster = 1.0–1.2.
Hosts and sex ratio
All Swedish specimens were reared from Galerucella lineola (Coleoptera: Chrysomelidae) on Salix spp., mainly Salix cinerea. The sex ratio of each clutch on average is closer to one than for Asecodes lucens, and the standard deviation is distinctly higher in Asecodes lineophagum. Ratio female/male (n = 48): 3.10±2.68/2.27±2.17
Material examined
HOLOTYPE female (BMNH) labelled “SWEDEN: Uppland, Ludden, 59°46'18"N, 18°40'19"E, 21.vi.2011, ex Galerucella lineola on Salix cinerea”. PARATYPES. 45♀ 49♂(BMNH, CH, LUZM, NHRS, ZSM): 25♀ 19♂with same label data as holotype; 3♀ 1♂“Sweden: Uppland, Fläktan, 59°46'54"N, 17°44'30"E, 24.vii.2011, ex Galerucella lineola on Salix cinerea.”; 3♀ 5♂“SWEDEN: Uppland, Liljekonvaljholmen, 59°48'18"N, 17°39'51"E, 18.vi.2011, ex Galerucella lineola on Salix sp.”; 6♀ 4♂“SWEDEN: Uppland, Mörtsjön, 59°38'39"N, 18°09"58"E, 5.vii.2011, ex Galerucella lineola on Salix cinerea”; 1♂“SWEDEN: Uppland, Sundängen, 59°33.954'N, 16°51.292'E, 25.vi.2011, ex Galerucella lineola on Salix cinerea”; 3♀ 6♂“SWEDEN: Uppland, Haknäs, 59°43'05"N, 17°41'57"E, 25.vi.2011, ex Galerucella lineola on Salix cinerea”; 1♀ “SWEDEN: Skåne, Skäralid, 6–17.viii.1994, M . Sporrong”; 3♀ (on two pins) labelled “Småland” [which is: SWEDEN: Småland, without further information]; 1♀ 1♂“SWEDEN: Skåne, Sövde, 5.vii.1985, C. Hansson”; 1♂“SWEDEN: Småland, Hyltebruk, 7–14.ix.1986, J. Ardö”; 1♂“NORWAY: Jostedalen, Gupne, 19.vii.1979, Hull University Expedition”.
Original Description
- Hansson, C; Hambäck, P; 2013: Three cryptic species in Asecodes (Förster) (Hymenoptera, Eulophidae) parasitizing larvae of Galerucella spp. (Coleoptera, Chrysomelidae), including a new species Journal of Hymenoptera Research, 30: 51-64. doi
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