Eurytoma imminuta Bugbee, 1951

Zhang, Y. Miles, Gates, Michael W. & Shorthouse, Joseph D., 2017, Revision of Canadian Eurytomidae (Hymenoptera, Chalcidoidea) associated with galls induced by cynipid wasps of the genus Diplolepis Geoffroy (Hymenoptera, Cynipidae) and description of a new species, Journal of Hymenoptera Research 61, pp. 1-29 : 12-13

Eurytoma imminuta Bugbee

Figs 10 , 36

Eurytoma imminuta Bugbee, 1951b: 259-260. Holotype female (USNM). Type data: USA, Nevada [Pyramid Lake]; associated with galls induced by Diplolepis variabilis (Bassett) on Rosa puberulenta , May 20, 1929.

Diagnosis.

Eurytoma imminuta can be distinguished from most Eurytoma species by black tegula and scape. E. imminuta differs from E. spongiosa by their small, oval metasoma that is not laterally compressed (Fig. 10 ).

Females.

Body length 1.9-4.0 mm. Color: Black except for the following yellow - basal half of scape, apical fifth of pro- and mesofemur, basal pro- and mesotibia, apex of hindlegs, tip of ovipositor sheaths, tarsomeres 1-4, wing veination (Fig. 10 ).

Head. 1.2 × as broad as high, umbilicate punctured with small tentorial pits. Genal carina present; malar space 0.8 × eye height, supraclypeal area smooth (Fig. 22 ). Toruli positioned slightly above lower ocular line. Intertorular space obtuse dorsally, with 2 rows setae. Ratio of LOL:OOL:POL is 1:1.2:2.4. Head posteriorly with postgenal lamina and postgenal grooves ridged, delimited ventrally by postgenal depression. Postgena sparsely setose. Funicular segments subequal in size, fusiform; pedicel chalice-shaped; F1 slightly narrowed basally, funicular segments with 2 rows of longitudinal sensilla and 3 whorls of setae; clava 2-segmented.

Mesosoma. Largely umbilicate, 1.5 × as long as broad; notauli complete, shallow. Epicnemium imbricate, flattened. Mesepisternum anterior to femoral depression umbilicate; mesepimeron mesepimeron reticulate ventrally, striolate or smooth dorsally, with longitudinal rugae originating from the posterior margin. Precoxal tooth formed by raised adscrobal carina present in lateral view. Lateral panel of propodeum and callus with umbilicate punctures, distinctly delimited from median area by carinae forming irregular setose cells, median furrow delimited, forming 2 rows of irregular foveae (Fig. 25 ). Procoxa imbricate, lacking setation proximally. Mesocoxal lamella absent. Metacoxa densely setose along anterior margins, glabrate with one row of setae along posterior distal margin. Forewing hyaline, marginal vein and postmarginal vein subequal in length.

Metasoma. Gaster 1.2 × as long as mesosoma in lateral view; smooth, anterior edge of gastral tergites microreticulate (Fig. 10 ). Petiole 0.5 × as long as broad in dorsal view, with projecting lateral teeth as well as mediodorsal prong. Gaster not laterally compressed, oval shaped and convex in lateral view, ovipositor parallel to horizontal axis. Gt1-3 glabrate, Gt4 with 1-4 setae lateromedially, Gt5-7 and apex of ovipositor sheath densely setose. Gt4 strongly emarginate on posterior margin dorsally.

Male.

Body length: 1.7-2.0 mm. Color: Black, yellow areas as described for female. Sculpture as described for female. Antennae with funicular segments pedunculate, F2-F5 each with 2 rows of erect setae and 1 row of longitudinal sensilla (Fig. 30 ); scape with ventral plate in apical half. Gastral petiole in lateral view cylindrical, in dorsal view length about 1.5 × as long as greatest width, 0.5 × times length of metacoxa; irregularly reticulate dorsally and ventrally, obliterated laterally.

Remarks.

E. imminuta in the USNM collection can be separated from E. spongiosa by the metasomal character noted. It is best to keep them as separate species based on the examination of hundreds of E. spongiosa in the collection in which there are smaller specimens resembles the E. imminuta in metasomal shape. The profemur leg coloration character is inconsistent within E. spongiosa .

Biology.

Reared from galls induced by Diplolepis ignota on R. woodsii , D. nebulosa , D. polita , D. spinosa on R. blanda , R. rugosa ; D. rosae on R. canina , D. triforma on R Rosa canina ; D. tumida on R. woodsii , and D. variabilis .

Material examined

(101 females, 50 males): CANADA: Alberta: Coaldale, 12.V.2007, J.D. & M.R. Shorthouse, ex Diplolepis ignota on Rosa woodsii (2F, CNCI); Head-Smashed-In Buffalo Jump , 10.V.2011, J.D. & M.R. Shorthouse, ex Diplolepis tumida on Rosa woodsii (3F, 2M, CNCI) . British Columbia: Kelowna , 20.V.2008, R.G. Lalonde, ex Diplolepis variabilis on Rosa woodsii (3F, 1M, CNCI) . Ontario: Cochrane, 24.IV.2010, J.D. Shorthouse & Y.M. Zhang, ex Diplolepis spinosa on Rosa blanda , (5F, CNCI); Kanata, 19.IV.2006, J.D. & M.R. Shorthouse, ex Diplolepis spinosa on Rosa rugosa (2F, 6M, CNCI); Manitoulin Island, 2.V.2009, J.D. Shorthouse & J.D. Renelli, ex Diplolepis triforma on Rosa canina (7F, 3M, CNCI); Manitoulin Island , 3.V.2009, J.D. Shorthouse & J.D. Renelli, ex Diplolepis rosae on Rosa canina (5F, 1M, CNCI); Manitoulin Island , 6.V.2010, J.D. Shorthouse & Y.M. Zhang, ex Diplolepis triforma on Rosa canina (9F, 5M, CNCI); Moose Factory Island , 23.IV.2010, J.D. Shorthouse & Y.M. Zhang, ex Diplolepis spinosa on Rosa blanda , (5F, 5M, CNCI); Picton, 28.IV.2003, J.D. Shorthouse, ex Diplolepis mayri/ D. rosae on Rosa canina (12F, 7M, CNCI) . Manitoba: Mordon , 1.IX.1986, J.D. Shorthouse, ex Diplolepis spinosa on Rosa woodsii (31F, 18M, CNCI) . Québec: Mt. Tremblant , 23.XII.2004, M.J.T. Bodnar, ex Diplolepis spinosa on Rosa rugosa (17F, 2M, CNCI) .

Distribution.

Widespread, from British Columbia, Alberta, Manitoba, Ontario, and Québec (Fig. 36 ).

Figures

Figures 6 - 11. Tenuipetiolus ruber 6 Female habitus. Eurytoma iniquus 7 Female habitus. E. longavena 8 Female habitus. E. discordans 9 Female habitus. E. imminuta 10 Female habitus (length 2.0 mm). E. spongiosa 11 Female habitus (length 3.2 mm), arrow pointing to precoxal tooth formed by the adscrobal carina.

Figure 32 - 37. 32 Known localities of Eurytoma shorthousei in Canada 33 Known localities of E. iniquus in Canada 34 Known localities of E. longavena in Canada 35 Known localities of E. discordans in Canada. 36. Known localities of E. imminuta in Canada 37 Known localities of E. spongiosa in Canada.

Figures 18 - 23. Eurytoma obtusilobae 18 Propodeum 20 Petiole, lateral view. E. shorthousei sp. n. 19 Propodeal spiracle 21 Petiole, dorsal view. E. discordans: 22 Head, anterior view 23 Head, posterior view.

Figure 24 - 28. Eurytoma shorthousei 24 Face in lateral view. E. longavena 25 Propodeum 28 Female metasoma, lateral view. E. discordans 26 Female antenna 27 Female metasoma.

Figure 29 - 31. Eurytoma discordans 29 Male antenna. E. longavena 30 Male antenna 31 Known localities of Tenuipetiolus ruber in Canada.