Tenuipetiolus ruber 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 : 3

Tenuipetiolus ruber Bugbee, 1951

Figs 5 , 6 , 31

Tenuipetiolus rubra Bugbee, 1951a: 39-42. Holotype female (USNM). Type data: USA, Indiana [Bloomington]; reared from galls induced by Diplolepis rosae (L.) on species of Rosa , March 28, 1939.

Females.

Body length 2.0-3.6 mm. Color: Black except yellow to brown on basal half of scape, pedicel, and funicular segments, apices of all femora, pro-, meso- and metatibia, tip of ovipositor sheath, tegula, wing venation; all tarsomeres 1-4 white (Fig. 6 ).

Head. Head 1.2 × as broad as high, umbilicate punctured with small tentorial pits. Genal carina present. Malar space 0.8 × eye height, clypeus emarginate and supraclypeal area superficially rugose. Toruli positioned dorsad lower ocular line. Antenna with funicular segments subequal in length; pedicel chalice-shaped; funiculars fusiform with one row longitudinal sensilla and two whorls of setae; F1 slightly narrowed basally. Ratio LOL:OOL:POL as 1:1:2.5. Head posteriorly without postgenal lamina or postgenal depression. Postgena sparsely setose.

Mesosoma. About 1.2 × as long as broad; notauli incomplete, shallow. Epicnemium imbricate, flattened. Mesepisternum anterior to femoral depression umbilicate; mesepimeron reticulate ventrally, striolate or smooth dorsally, with longitudinal rugae originating from the posterior margin. Propodeum concave, superficially punctate, bordered mediolaterally by numerous carinae forming irregular setose cells, median furrow not delimited (Fig. 5 ). Procoxa imbricate, lacking setation proximally. Metacoxa asetose anteriorly and one row of setae on the posterior apical margin. Forewing hyaline, marginal vein distinctly longer than postmarginal vein.

Metasoma. Gaster 1.5 × as long as mesosoma in lateral view; smooth, anterior edge of gastral tergites microreticulate. Petiole 2 × length of metacoxa (Fig. 5 ). Gaster laterally compressed, triangular shaped and strongly convex in lateral view, ovipositor parallel to horizontal axis. Gt1 and Gt2 fused dorsally, Gt1-4 glabrate, Gt5-8 and apex of ovipositor sheaths setose.

Male.

Body length: 1.4-2.5 mm. Color 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; scape without ventral plaque. Petiole in lateral view cylindrical, in dorsal view about 3 × as long as greatest width, 2 × as long as metacoxa; strigose laterally.

Remarks.

This species is likely a generalist that is not restricted only to Diplolepis galls. Rearing records reported in the original description include cynipids of the genus Diastrophus .

Biology.

Reared from field populations of galls induced by Diplolepis bassetti on Rosa woodsii Lindl.; D. polita , D. nodulosa , and D. triforma on Rosa acicularis Lindl.

Material examined

(27 females, 12 males). CANADA: British Columbia: Osoyoos , 14.V.2003, J.D. & M.R. Shorthouse, ex Diplolepis bassetti on Rosa woodsii (3F, 3M, CNCI) . Ontario: Chelmsford, 5.V.1994, S.E. Brooks, ex Periclistus pirata -modified galls of Diplolepis nodulosa (3F, 1M, CNCI); Cochrane, 24.IV.2010, J.D. Shorthouse & Y.M. Zhang, ex Diplolepis triforma on Rosa acicularis (9F, 2M, CNCI); Manitoulin Island , 2.V.2009, J.D. Shorthouse & J.D. Renelli, ex Diplolepis triforma on Rosa acicularis (5F, 1M, CNCI) . Québec: La Sarre , 13.VII.2010, B.L. Smallwood & Y.M. Zhang, ex Diplolepis polita on Rosa acicularis (7F, 5M, CNCI) .

Distribution.

Disjunctive populations have been found in Western Canada in British Columbia and Eastern Canada in Ontario and Québec (Fig. 31 ).

Figures

Figures 1 - 5. Eurtyoma longavena 1 Female ovipositing into immature gall 2 Egg deposited on the inside surface of gall chamber 3 Mature larva inside a gall showing frass as a result of feeding on gall tissue 4 Pupa overwintering inside the gall before exiting the following year. Tenuipetiolus ruber 5 Propodeum + petiole. Photos 1 - 4 credit Brandy L. Fenwick.

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