Omphale isander (Walker)

Hansson, Christer & Shevtsova, Ekaterina, 2012, Revision of the European species of Omphale Haliday (Hymenoptera, Chalcidoidea, Eulophidae), ZooKeys 232, pp. 1-157 : 112-114

Omphale isander (Walker) Figures 438-452500535

Cirrospilus isander Walker, 1839:326. Lectotype female in NMID, not examined.

Tetrastichus isander (Walker) Walker (1846).

Asecodes fimbriatus Jansson, 1955:87. Holotype female in LUZM, examined. Synonymized by Bouček and Askew 1968.

Eugerium isander (Walker) Graham (1959).

Omphale isander (Walker) Hansson (1996b).

Material.

Type material.Holotype female of Asecodes fimbriatus , type no. 131:1 in LUZM. Additional material. 51♀ 19♂: Finland 2♀ 2♂ (CH), Hungary 4♀ 5♂ (BMNH, CH), Norway 1♀ (BMNH), Russia 3♀ 2♂ (BMNH), Sweden 29♀ 10♂ (BMNH, CH, LUZM, NHRS), United Kingdom 12♀ (BMNH).

Diagnosis.

Small species (0.7-1.1 mm); body dark brown with metallic tinges (Fig. 438); midlobe of mesoscutum with one pair of setae (posterior pair) (Figs 445, 449); forewing with long marginal fringe, e.g. setae along outer margin are 0.3 × as long as width of wing, and a very short postmarginal vein (Fig. 443); head smooth (Figs 447, 448, 451, 452); vertex with distinct sulci between ocelli and eyes (Figs 448, 452); clypeus with median part of ventral margin drawn out into a rounded point (Figs 447, 451); male antenna with scape with basal 2/3 gradually expanding towards apical part and then abruptly narrowing off (Fig. 450).

Description.

Female. Length of body 0.7-1.1 mm. Antenna with scape and pedicel yellowish white; flagellum pale brown with metallic tinges; flagellum long and slender, pedicel + flagellum 2.6 × as long as distance between eyes; first flagellomere 0.9 × as long and about 1.2 × as wide as second flagellomere (Fig. 446); flagellomeres with few long and scattered setae; longitudinal sensilla very long and setae-like but thicker and paler than setae; clava 1-segmented. Face dark brown with metallic tinges (Fig. 441), smooth (Fig. 447); clypeus dark brown with metallic tinges, smooth, rectangular but with lower margin protruding and with median part more or less pointed; 2.0 × as wide as high; gena dark brown with metallic tinges; frontal cross-ridge absent; lower frons dark brown with metallic tinges, smooth, subtorular area smooth; interscrobal area smooth; antennal scrobes join frontal suture separately; frontal suture V-shaped; upper frons and vertex dark brown with metallic tinges, smooth (Fig. 448). Occipital margin with a carina (Fig. 448).

Mesoscutum dark brown with metallic tinges (Fig. 439) and engraved reticulation (Fig. 445), midlobe with one pair of setae (posterior pair); notauli as indistinct impressions in posterior ½. Scutellum dark brown with metallic tinges (Fig. 439), with engraved reticulation (Fig. 445); 1.2 × as long as wide, with anterior margin smoothly curved forwards. Axillae dark brown with metallic tinges (Fig. 439). Dorsellum dark brown with metallic tinges (Fig. 439), smooth and convex (Fig. 445), 0.4 × as long as wide, and 0.4 × as long as length of median propodeum. Lateral mesosoma dark brown with metallic tinges (Fig. 438); transepimeral sulcus straight. Propodeum dark brown with metallic tinges (Fig. 439), smooth (Fig. 445); propodeal callus with two setae. Fore- and midlegs with coxae dark brown with metallic tinges (Fig. 438), femora pale brown in basal ⅔ and yellowish white in apical ⅓, tibiae and tarsi yellowish white; midleg with first tarsomere 0.3 × as long as length of tarsus; hind leg with coxa white with base dark brown, femur dark brown with metallic tinges, tibia and tarsus yellowish white. Forewing transparent, veins yellowish white and setae dark brown (Fig. 443); speculum closed; admarginal setae 9-11, arising from marginal vein; radial cell bare; postmarginal vein rudimentary; stigmal vein long and narrow; marginal fringe with long setae, e.g. setae along outer margin are 0.3 × as long as width of wing. Hind wing transparent, apex pointed (Fig. 443). Forewing WIP (Fig. 444) unicoloured in blue.

Petiole white. Gaster dark brown with metallic tinges, ovate and 1.2 –1.3× as long as length of mesosoma; 7th tergite very short and usually hidden under 6th tergite.

Male. Length of body 0.9-1.1 mm. Features as in female except as follows. Antenna with scape with basal ⅔ gradually expanding towards apical part then abruptly narrowing off (Fig. 450); pedicel + flagellum 3.0 × as long as distance between eyes; first flagellomere 1.0 × as long as second flagellomere; flagellomeres 1-4 with setae confined to a basal whorl; clava 1-segmented.

Scutellum 1.3 –1.4× as long as wide. Dorsellum 0.5 × as long as wide, and 0.6 × as long as length of median propodeum. Legs yellowish brown to yellowish white, except pale brown hind femur and base of all coxae. Forewing admarginal setae 5-7.

Petiole white. Gaster dark brown with metallic tinges, posteromedian part of first tergite and anteromedian part of second with a small white spot, 1.1 –1.3× as long as length of mesosoma. Phallobase and aedeagus as in Fig. 500.

Host.

From Mycodiplosis sp. ( Diptera : Cecidomyiidae ) feeding on leaf rust on Populus ( Kamijo 1986).

Distribution.

Czech Republic ( Peck et al. 1964), Finland (new record), France ( Erdös 1958), Hungary ( Jansson 1955), Ireland ( Walker 1839), Moldova ( Bouček 1965), Norway (new record), Russia (new record), Sweden ( Jansson 1955), United Kingdom ( Walker 1839); Japan ( Kamijo 1986) (Fig. 535).

Remarks.

The lectotype of Cirrospilus isander in NMID has not been available for examination, and the interpretation of this species is based on the information in Graham (1959) and the type of Asecodes fimbriatus . Omphale isander is a very characteristic species unlike any other species in the genus and therefore difficult to assign to a specific group. In connection with the synonymization of Eugerium Graham with Omphale , Hansson (1996b) discussed Omphale isander in detail.