Table 1. Summary information of symphytan mitochondrial genomes used in phylogenetic analyses.

	Species	Family	Accesion number	References
Ingroup	Analcellicampa xanthosoma	Tenthredinidae		This study
	Chinolyda flagellicornis	Pamphiliidae	MH577057	Niu et al. (2019)
	Megalodontes cephalotes	Megalodontesidae	MH577058	Niu et al. (2019)
	Megalodontes spiraeae	Megalodontesidae	MH577059	Niu et al. (2019)
	Allantus luctifer	Tenthredinidae	KJ713152	Wei, Niu & Du (2014)
	Arge bella	Argidae	MF287761	Du et al. (2018)
	Asiemphytus rufocephalus	Tenthredinidae	KR703582	Song et al. (2016)
	Calameuta filiformis	Cephidae	KT260167	Korkmaz et al. (2016)
	Calameuta idolon	Cephidae	KT260168	Korkmaz et al. (2016)
	Cephus cinctus	Cephidae	FJ478173	Dowton et al. (2009)
	Cephus pygmeus	Cephidae	KM377623	Korkmaz et al. (2015)
	Cephus sareptanus	Cephidae	KM377624	Korkmaz et al. (2015)
	Characopygus scythicus	Cephidae	KX907848	Korkmaz et al. (2018)
	Labriocimbex sinicus	Cimbicidae		YC Yan, 2019, unpublished data
	Corynis lateralis	Cimbicidae	KY063728	Doğan & Korkmaz (2017)
	Hartigia linearis	Cephidae	KX907843	Korkmaz et al. (2018)
	Janus compressus	Cephidae	KX907844	Korkmaz et al. (2018)
	Monocellicampa pruni	Tenthredinidae	JX566509	Wei, Wu & Liu (2015)
	Birmella discoidalisa	Tenthredinidae	MF197548	GY Niu, 2017, unpublished data
	Orussus occidentalis	Orussidae	FJ478174	Dowton et al. (2009)
	Pachycephus cruentatus	Cephidae	KX907845	Korkmaz et al. (2018)
	Pachycephus smyrnensis	Cephidae	KX907846	Korkmaz et al. (2018)
	Perga condei	Pergidae	AY787816	Castro & Dowton (2005)
	Syrista parreyssi	Cephidae	KX907847	Korkmaz et al. (2018)
	Tenthredo tienmushana	Tenthredinidae	KR703581	Song et al. (2015)
	Trachelus iudaicus	Cephidae	KX257357	Korkmaz et al. (2017)
	Trachelus tabidus	Cephidae	KX257358	Korkmaz et al. (2017)
	Trichiosoma anthracinum	Cimbicidae	KT921411	Song et al. (2016)
	Taeniogonalos taihorina	Trigonalidae	NC027830	Wu et al. (2014)
	Parapolybia crocea	Vespidae	KY679828	Peng, Chen & LI (2017)
Outgroup	Paroster microsturtensis	Dytiscidae	MG912997	Hyde et al. (2018)
	Neopanorpa phlchra	Panorpidae	FJ169955	J Hua, 2016, unpublished data
	Neochauliodes parasparsus	Corydalidae	KX821680	Zhao, Zhang & Zhang (2017)
	Anopheles gambiae	Culicidae	L20934	Beard, Hamm & Collins (1993)