Omphale erginnus (Walker)

Hansson, Christer & Shevtsova, Ekaterina, 2012, Revision of the European species of Omphale Haliday (Hymenoptera, Chalcidoidea, Eulophidae), ZooKeys 232, pp. 1-157 : 109-112

Omphale erginnus (Walker) Figures 423-437499534

Entedon erginnus Walker, 1839:124. Lectotype male in BMNH, examined.

Omphale erginnus (Walker), Graham (1959).

Omphale erginnus (Walker), Graham (1963).

Omphale erginnus (Walker), Hansson (1996b).

Omphale erginnus (Walker), Hansson (1997).

Omphale erginnus (Walker), Hansson (2004).

Material.

Type material. Lectotype male, type no. 5.2038 in BMNH. Additional material. 9♀ 5♂: Netherlands 1♀ (RMNH), Sweden 5♀ 2♂ (LUZM, NHRS), Uni-ted Kingdom 3♀ 3♂ (BMNH).

Diagnosis.

Female flagellum with 1-segmented clava (Fig. 431); male scape with a sharp dent ventroapically (Fig. 435); clypeus poorly delimited with (short) grooves laterally only (Figs 432, 436); head without frontal cross-ridge (Figs 432, 436); setae on vertex and thoracic dorsum long (e.g. vertexal seta situated in middle of ocellar triangle as long as distance between posterior ocelli (Figs 433, 437)); transepimeral sulcus straight; male gaster dark brown with a median white spot across tergites 1-3.

Description.

Female. Length of body 1.4-1.9 mm. Antenna with scape yellowish brown with dorsal margin dark brown; pedicel and flagellum dark brown and shiny; pedicel + flagellum 2.2 × as long as distance between eyes; first flagellomere 1.0 × as long and 1.0 × as wide as second flagellomere (Fig. 431); flagellomeres 1-4 with scattered short setae; longitudinal sensilla on flagellomeres as long as flagellomere attached to; clava 1-segmented. Face purple or green metallic (Fig. 426), smooth (Fig. 432); clypeus purple or green metallic, smooth, poorly delimited with grooves laterally only; gena purple or green metallic; frontal cross-ridge absent; lower frons purple or green metallic, with raised reticulation, smooth close to frontal suture; interscrobal area smooth; antennal scrobes join frontal suture separately; frontal suture V-shaped; upper frons purple or green metallic with very weak reticulation, shiny; vertex golden with green tinges or green metallic, smooth or with weak reticulation (Fig. 433). Occipital margin with a sharp carina (Fig. 433).

Mesoscutum golden with green tinges (Fig. 424), with engraved reticulation (Fig. 430), midlobe with two pairs of setae; notauli as indistinct impressions in posterior ½. Scutellum golden (Fig. 424), with engraved reticulation (Fig. 430); 1.2 × as long as wide, with anterior margin straight. Axillae purple metallic (Fig. 424). Dorsellum purple metallic to golden (Fig. 424), smooth and convex (Fig. 430), with or without a weak median carina, 0.5 × as long as wide, and 0.7 × as long as length of median propodeum. Lateral pronotum golden (Fig. 423); propleuron dark brown with metallic tinges; prepectus golden; acropleuron dark brown and mes-episternum dark brown with metallic tinges; upper mesepimeron dark brown with metallic tinges; lower mesepimeron dark brown with metallic tinges; transepimeral sulcus straight. Propodeum golden with green tinges (Fig. 424), smooth (Fig. 430); propodeal callus with two setae. Foreleg with coxa yellowish brown with base pale brown (Fig. 423), femur, tibia and tarsus yellow; mid- and hind legs yellow; midleg with first tarsomere 0.3 × as long as length of tarsus. Forewing transparent, veins yellowish white and setae dark brown (Fig. 428); speculum closed; admarginal setae 10-13, arising from marginal vein and from membrane just below vein; radial cell setose; postmarginal vein 0.8 × as long as stigmal vein; stigmal vein long and slender. Hind wing transparent, apex rounded (Fig. 428). Forewing WIP (Fig. 429) with apical ½ yellow and basal ½ blue, separated by a band of magenta, apical ½ also with a narrow blue band along upper margin.

Petiole yellow to yellowish brown. Gaster dark brown with golden, purple and green metallic tinges, smooth, elongate and 1.5 –1.7× as long as length of mesosoma; 7th tergite 0.1 × as long as length of gaster.

Male. Length of body 1.2-1.6 mm. Features as in female except as follows. Antenna with scape yellowish brown with dorsal edge dark brown, to predominantly dark brown, pedicel pale brown, flagellum dark brown; pedicel + flagellum 2.5 × as long as distance between eyes; flagellomeres 1-4 with scattered setae (Fig. 435); clava 1-segmented. Face purple metallic (Fig. 427); clypeus golden with green tinges; gena purple metallic; lower frons golden with purple tinges, with very weak reticulation; antennal scrobes parallel and join frontal suture separately; upper frons golden, with very weak reticulation; vertex purple metallic.

Mesoscutum black or golden with green tinges (Fig. 425). Scutellum 1.1 × as long as wide. Dorsellum purple metallic (Fig. 425), 0.4 × as long as wide (Fig. 434), and 0.5 × as long as length of median propodeum. Propodeum golden (Fig. 425), smooth with some parts with very weak reticulation (Fig. 434). Legs with coxae dark brown; femora yellowish brown; tibiae and tarsi yellow. Forewing veins dark brown; admarginal setae 11-12, arising mainly from marginal vein; postmarginal vein 0.9 × as long as stigmal vein.

Petiole dark brown. Gaster dark brown with a median white spot across tergites 1-3, smooth, 1.2 × as long as length of mesosoma. Phallobase and aedeagus as in Fig. 499.

Hosts.

Associatedwith bracket fungi, possibly a Cecidomyiidae ( Diptera ) ( Hansson 1996b).

Distribution.

Hungary ( Graham 1963), Netherlands (new record), Sweden (new record), United Kingdom ( Walker 1839); Canada ( Hansson 1996b), USA ( Hansson 1996b), Mexico ( Hansson 1997), Costa Rica ( Hansson 2004), Guatemala ( Hansson 2004), Honduras ( Hansson 2004) (Fig. 534).

Remarks.

The character-set present in this species (see diagnosis above) is unlike any other species in the genus, and the appearance of the male phallobase is also unique. These features makes it difficult to assess Omphale erginnus to any of the species-groups.