Eurytoma gatesi, 2014

Delvare, Gérard, Gebiola, Marco, Zeiri, Asma & Garonna, A. P., 2014, Revision and phylogeny of the European species of the Eurytoma morio species group (Hymenoptera: Eurytomidae), parasitoids of bark and wood boring beetles, Zoological Journal of the Linnean Society 171 (2), pp. 370-421 : 392-394

EURYTOMA GATESI DELVARE SP. NOV.

( FIGS 16A–K , 17A–C )

Type material

Holotype ♀. Canada: British Colombia, Saanich- Victoria, 60 m a.s.l., 48°35′55″N, 123°26′37″W, ex seeds of Pseudotsuga menziesii , 30.vii.2002 (A. Roques) (in USNM) . Paratypes. Same data as holotype (33 ♀, 1 ♂ in USNM, MNHN, CBGP, GDPC) . USA: New Mexico, Ruidoso , ex seeds of Pseudotsuga menziesii , 22.v.2006 (A. Roques) (3 ♀, 4 ♂, in USNM, GDPC) . France: Lot, Lavercantière , 44°36′57″N, 01°20′46″E, ex seeds of Pseudotsuga menziesii , 26.vi.2007 (A. Roques) (7 ♀, 10 ♂, in MNHN, GDPC, RAPC) ; Lot, Sousceyrac , 560 m a.s.l., 44°51′20″N, 02°06′37″E, ex seeds of Pseudotsuga menziesii , 26.vi.2007 (A. Roques) (2 ♀, 1 ♂, in GDPC) .

Diagnosis

Head transverse in dorsal view, 1.90 times as wide as long. OOL greater than lateral ocelli diameter. Head subtrapezoidal in frontal view, outline of gena straight. Setation of head sparse and thin. Clypeus weakly emarginate. Lower face punctured with short radiating ridges and median subantennal smooth stripe. Anterior outline of mesepisternum straight. Metacoxa bare dorsally at base. Setation of lower surface of costal cell as usual, not especially dense and leaving posterior bare stripe. Marginal vein not thickened, 7.0 times as long as wide. Gaster short and not laterally compressed, as long as mesosoma (ovipositor exclud- ed). Syntergum much shorter than GT6 on median line. Ovipositor horizontal.

Female

Body length 3.15 mm. Body, coxae, apices of mandibles, and most of ovipositor black. Trochanters, femora, and tibiae dark brown to black but diffuse apicoventral spot on profemur and inner stripe on protibia, reddish testaceous. Tarsi pale testaceous. Rest of mandibles, scape basally, and apex of ovipositor reddish. Apex of scape, pedicel, and flagellum dark brown. Veins brown. Setation on body silvery, dark brown on forewing.

Head. Punctured but lower face smooth on a medial stripe and with radiating crests on either side of that stripe. Setation sparse and thin. Head relatively transverse both in frontal and dorsal view, about 1.40 times as broad as high and 1.90 times as broad as long. OOL larger than diameter of lateral ocellus (1.20×). Temples merging to occiput without angle. Outline of gena straight. Clypeus weakly emarginate on ventral margin. Gena entirely but superficially punctured. Malar space 0.74 times as long as height of eyes and 0.83 times width of oral fossa. Eyes separated by about 1.50 times their own height.

Antenna. Scape linear, pedicel without basal constriction, funicular segments fusiform, slightly decreasing in length from base to apex. Clava moderately rounded at apex.

Mesosoma 1.73 times as long as wide. Pro- and mesonotum uniformly and densely punctured. Mesoscutum about 1.20 times as long as pronotum. Notauli shallow and crenulate, partly obliterated by sculpture of mesoscutum. Scutellum as long as broad. Lateral panel of prepectus superficially crenulate and separated from sublateral panel by step-like ridge. Anterior outline of mesepisternum straight. Propodeum with median channel not well delimited, areolate rugose.

Appendices. Metacoxa bare dorsally at base. Setation of lower surface of costal cell as usual, not especially dense and leaving posterior bare stripe. Costal cell 0.40 times as length of wing. Marginal vein not thickened, 7.0 times as long as wide. Marginal and postmarginal veins, respectively, twice and 1.24 times as long as stigmal.

Metasoma. Petiole short, bearing sharp median and anterolateral teeth. Gaster evidently short, not laterally compressed, as long as mesosoma. GT4 broadly overlapping the following tergite. Syntergum much shorter than GT6 on median line. Ovipositor horizontal.

Male

Body length 2.8 mm. Scape completely black, with large and protruding ventral swelling, progressively narrowing to apex. All funicular segments strongly asym- metric, nodiform, and with an apical peduncle. Propodeum with deep and crenulate median channel, the median crest short and irregular. Pilosity of forewing dark.

Etymology

The species is dedicated to Dr Michael Gates (USMN) for his contribution to our knowledge of the family Eurytomidae .

Remarks

None of the described species from North America has been reported as having similar biology. Furthermore, numerous type species from the Nearctic region were examined by G.D. Moreover, Michael Gates, from USNM, provided us with images of most of the types. None of them agrees with the morphological characters of the species.

Biology. The larvae are phytophagous, developing within seeds of the Douglas fir, Pseudotsuga menziesii (Mirb.) Franco, 1950 (Pinaceae) .

Distribution

Samples were collected in British Colombia, California, and New Mexico, and the same Eurytoma was found in Lot, France, in two nurseries of the Office National des Forêts. The species is probably native of western North America , as for the Douglas fir, and was introduced to Europe along with the plant (see Fig. S 10 in Appendix S8).

Figures

Figure 10. A–D, Eurytoma afra: A–C, female; D, male. A, head in frontal view; B, head and pronotum in lateral view; C, head and mesosoma in dorsal view; D, antenna.

Figure 16. A–J, Eurytoma gatesi sp. nov. (♀): A, head in frontal view; B, head in dorsal view; C, lower face; D, antenna; E, mesopleuron; F, mesosoma in dorsal view; G, propodeum; H, forewing; I, apical venation; J, petiole in lateral view; K, gaster in lateral view.

Figure 17. A, B, Eurytoma gatesi (♂): A, antenna; B, scape; C, propodeum.