World Cynipoidea (Hymenoptera): A Key to Higher- Level Groups Author Buffington, Matthew L. Systematic EntomologyLaboratory, ARS-USDAc / oNational Museumof NaturalHistory, SmithsonianInstitution, 10 th & Constitution Ave NW, Washington, DC 20013, USA, matt.buffington@usda.gov Author Forshage, Mattias Department of Zoology, Naturhistoriska Riksmuseet, Box 50007, SE- 104 05 Stockholm, Sweden, Author Liljeblad, Johan Swedish Species Information Centre, PO Box 7007, SE- 750 07 Uppsala, Sweden, Author Tang, Chang-Ti Department of Biological Sciences, The George Washington University, SEH, Suite 6300, 800 22 nd Street, NW, Washington, DC 20052, USA, Author Noort, Simon van Research and Exhibitions Department, South African Museum, Iziko Museums of South Africa, P. O. Box 61, Cape Town 8000, South Africa, text Insect Systematics and Diversity 2020 2020-07-01 4 2020 1 1 69 http://dx.doi.org/10.1093/isd/ixaa003 journal article 10.1093/isd/ixaa003 2399-3421 4552110 Diplolepidini Figs. 208–210 Members of this tribe are all gallers of Rosa in the Holarctic Region. The wide variety of galls produced by these species, and the relative ease of locating them in the field, has led to a rather extensive literature on the biology and ecology of these wasps. A very thorough review by Shorthouse (1993) describes in detail the research on the diplolepidine wasps, including gall induction, larval feeding, life cycle aspects, and parasitoids. As hybridzation among rose species can be common, confusing the taxonomy of the group, rose gallers seem to have adapted to intermediate species, much in the same way oak gallers in the Cynipini seem to have ‘specialized’ on intermediate oak species. Morphologically, these wasps all share a rather unique hypopygium that extends ventrally, and has been described as ‘plough-share shaped’ in literature. Phylogenetically, Liljeblad and Ronquist (1998) recovered this group as sister to Eschatocerus , with Plate9. Diplolepidini .Fig.208, Diplolepis sp.,USNMENT01231850.Fig.209, Diplolepis rosae ,USNMENT 00655959.Fig.210, Diplolepis bicolor ,USNMENT 01231831. low support. More recently, Ronquist et al. (2015) found the group sister to Pediaspini and Eschatocerini . Biology. Gall inducers on Rosa (Rosaceae) . Distribution. Holarctic. Could be moved into non-native areas with horticultural products. Relevant literature. Shorthouse (1993 , 2001 ) are the most comprehensive reviews to date; Ronquist (1994 , 1999 ), Liljeblad and Ronquist (1998), and Ronquist et al. (2015) investigated the phylogenetics of the group. Classification. Diplolepidini Latreille, 1802 Diplolepis Geoffroy, 1762 ; 52 species but taxonomy is uncertain and far from stable with many more or less dubious taxa; NA, PA Liebelia Kieffer, 1903 ; 9 species PA