“…α , β , γ , δ , ε , Lenti -, and Spuma -represent A lpharetrovirus , Betaretrovirus , Gammaretrovirus , Deltaretrovirus , Epsilonretrovirus , Lentivirus , and Spumaretrovirinae , respectively. The dark blue and orange circles indicate the presence of corresponding exogenous retroviruses and ERVs based on literature ( Xu et al., 2018 ; Zheng et al., 2021 ; Hayward et al., 2015 ; Han and Worobey, 2012a , 2012b , 2012c , 2014 , 2015 ; Chen et al. 2019 , 2021a , 2021b ; Wang and Han, 2021a ).…”