Eurytoma, Illiger, 1807

Gómez, José Francisco, Nieves-Aldrey, José Luis, Nieves, María Hernández & Stone, Graham Nicholas, 2011, Comparative morphology and biology of terminalinstar larvae of some Eurytoma (Hymenoptera, Eurytomidae) species parasitoids of gall wasps (Hymenoptera, Cynipidae) in western Europe, Zoosystema 33 (3), pp. 287-323 : 310

Eurytoma sp. cf. jaceae

MATERIAL EXAMINED. — Ex Iraella luteipes : Spain. Madrid, Soto de Oreja, 3. VI.2006, J. L. Nieves leg (n = 2). — Madrid, Valdemorillo, 13. VI.2003, J. L. Nieves (n = 1).

DESCRIPTION

n = 3; Body length 1.5 mm; body width 0.65 mm (range 0.6-0.7) ( Figs 6C ; 8C ); ratio L/W = 2.57; ventral margin of body segments straight; anterodorsal protuberances present from second thoracic segment to the seventh abdominal, protruding beyond the dorsal margin of body segments ( Fig. 8C ).

Antero-medial setae of the antennal area situated slightly below the antennae; antero-medial setae of vertex situated relatively high on the upper face, much closer to the anterior margin of vertex than to the antennae ( Fig. 10D ); ratios SA/LAA = 0.66 and SA/DAV = 1.02; dorsal-labral setae longer than clypeal setae; ventral margin of clypeus with a distinct suture; labrum with deep divisions reaching the level of labral setae; lobes clearly differentiated; maxillary palps inconspicuous ( Fig. 12E ).

Mandibles with two teeth and exposed in part, with the tip of the first tooth visible ( Fig. 12E ); ratio L/W 1T = 1.67; outer margin of first tooth strongly convex, with the tip moderately recurved; apex of the second tooth straight, directed upwards in the same direction as the first tooth and more or less acute; inner margin of mandible from the base of second tooth more or less straight with the margin not interrupted ( Fig. 13K ).

BIOLOGY

This species is only known as a monophagous primary ectoparasitoid in the stem galls of Iraella luteipes (Thomson, 1877) on opium poppy ( Papaver somniferum L. [ Papaveraceae ]). It is univoltine and the fully-grown larvae overwinter inside the old galls, with adults emerging in the spring in synchrony with the development of new host galls.

REMARKS

The identification of material for this species as E. jaceae is doubtful, and it may represent an undescribed species. The adults of this material and typical E. jaceae differ in several morphological traits (Askew, pers.comm.).

Figures

FIG. 6.— Ventralviews of terminal-instar eurytomid larvae:A, Eurytoma rufipes Walker, 1832; B, E. sp. nr. aspila; C, E. sp. nr. jaceae; D, E. strigifrons Thomson, 1876; E, E. timaspidis (Mayr, 1904). Scale bars: 1 mm.

FIG. 8.— Lateral views of terminal-instar eurytomid larvae:A, Eurytoma rufipes Walker,1832; B, E. sp. cf. aspila; C, E. sp. cf. jaceae; D, E. strigifrons Thomson, 1876; E, E. timaspidis (Mayr, 1904). Scale bars: 1 mm.

FIG. 10. — Anterior views of the head of terminal-instar eurytomid larvae:A, Eurytoma rosae Nees,1834 ex Diplolepis rosae; B, E. rufipes Walker, 1832; C, E. sp. cf. aspila; D, E. sp. cf. jaceae; E, E. strigifrons Thomson, 1876; F, E. timaspidis (Mayr, 1904). Scale bars: A-C, 300 μm; D, 200 μm; E, F, 400 μm.

FIG. 12. — Anterior views of mouthparts of terminal-instar eurytomidae larvae:A, Eurytoma robusta Mayr,1878; B, E. rosae Nees,1834 ex Diplolepis rosae; C, E. rufipes Walker,1832;D, E.sp.cf.aspila; E, E. sp. cf. jaceae; F, E.strigifrons Thomson,1876; G, E.timaspidis (Mayr, 1904). Scale bars: A-E, 100 μm; F, G: 200 μm.

FIG. 13.— Anterior views of the right mandible of terminal-instar eurytomid larvae:A, Eurytoma aspila (Walker,1836) ex Phanacis caulicola; B, E. brunniventris Ratzeburg, 1852 ex Cynips quercus (A); C, E. cynipsea Boheman, 1836 ex Phanacis hypochoeridis; D, E. infracta Mayr, 1904; E, E. mayri Ashmead, 1887; F, E. pediaspisi Pujade i Villar, 1994; G, E. robusta Mayr, 1878; H, E. rosae Nees, 1834 ex Diplolepis rosae; I, E. rufipes Walker, 1832; J, E. sp. cf. aspila; K, E. sp. cf. jaceae; L, E. strigifrons Thomson, 1876 (right mandible); M, E. strigifrons (left mandible); N, E. timaspidis (Mayr, 1904). Scales bars: A, D-G, I-N, 50 μm; B, 20 μm; C, H, 100 μm.