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Oeyen, Jan Philip; Baa-Puyoulet, Patrice; Benoit, Joshua B.; Beukeboom, Leo W.; Bornberg-Bauer, Erich; Buttstedt, Anja; Calevro, Federica; Cash, Elizabeth; Chao, Hsu; Charles, Hubert; Chen, Mei-Ju May; Childers, Christopher; Cridge, Andrew G.; Dearden, Peter; Huyen, Dinh; Doddapaneni, Harsha Vardhan; Dolan, Amanda; Donath, Alexander; Dowling, Daniel; Dugan, Shannon; Duncan, Elizabeth; Elpidina, Elena N.; Friedrich, Markus; Geuverink, Elzemiek; Gibson, Joshua D.; Grath, Sonja; Grimmelikhuijzen, Cornelis J. P.; Grosse-Wilde, Ewald; Gudobba, Cameron; Han, Yi; Hansson, Bill S.; Hauser, Frank; Hughes, Daniel S. T.; Ioannidis, Panagiotis; Jacquin-Joly, Emmanuelle; Jennings, Emily C.; Jones, Jeffery W.; Klasberg, Steffen; Lee, Sandra L.; Lesny, Peter; Lovegrove, Mackenzie; Martin, Sebastian; Martynov, Alexander G.; Mayer, Christoph; Montagne, Nicolas; Moris, Victoria C.; Munoz-Torres, Monica; Murali, Shwetha Canchi; Muzny, Donna M.; Oppert, Brenda; Parisot, Nicolas; Pauli, Thomas; Peters, Ralph S.; Petersen, Malte; Pick, Christian; Persyn, Emma; Podsiadlowski, Lars; Poelchau, Monica F.; Provataris, Panagiotis; Qu, Jiaxin; Reijnders, Maarten J. M. F.; von Reumont, Björn Marcus; Rosendale, Andrew J.; Simao, Felipe A.; Skelly, John; Sotiropoulos, Alexandros G.; Stahl, Aaron L.; Sumitani, Megumi; Szuter, Elise M.; Tidswell, Olivia; Tsitlakidis, Evangelos; Vedder, Lucia; Waterhouse, Robert M.; Werren, John H.; Wilbrandt, Jeanne; Worley, Kim C.; Yamamoto, Daisuke S.; Zande, Louis van de; Zdobnov, Evgeny M.; Ziesmann, Tanja; Gibbs, Richard A.; Richards, Stephen; Hatakeyama, Masatsugu; Misof, Bernhard and Niehuis, Oliver (2020): Sawfly Genomes Reveal Evolutionary Acquisitions That Fostered the Mega-Radiation of Parasitoid and Eusocial Hymenoptera. In: Genome Biology and Evolution, Vol. 12, No. 7: pp. 1099-1118

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The tremendous diversity of Hymenoptera is commonly attributed to the evolution of parasitoidism in the last common ancestor of parasitoid sawflies (Orussidae) and wasp-waisted Hymenoptera (Apocrita). However, Apocrita and Orussidae differ dramatically in their species richness, indicating that the diversification of Apocrita was promoted by additional traits. These traits have remained elusive due to a paucity of sawfly genome sequences, in particular those of parasitoid sawflies. Here, we present comparative analyses of draft genomes of the primarily phytophagous sawfly Athalia rosae and the parasitoid sawfly Orussus abietinus. Our analyses revealed that the ancestral hymenopteran genome exhibited traits that were previously considered unique to eusocial Apocrita (e.g., low transposable element content and activity) and a wider gene repertoire than previously thought (e.g., genes for CO2 detection). Moreover, we discovered that Apocrita evolved a significantly larger array of odorant receptors than sawflies, which could be relevant to the remarkable diversification of Apocrita by enabling efficient detection and reliable identification of hosts.

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