English: X-ray tomography of fossils. a Host fly puparium (NRM-PZ Ar65720). b Volume rendering of a. c Longitudinal section of b. d Parasitoid wasp inside host (perspective view; Supplementary Movie 1). e Xenomorphia resurrecta, male (NRM-PZ Ar65720) in symmetric posture with folded wings. f X. resurrecta, female (NMB F2875) in asymmetric posture with unfolded wings. g–i Transverse sections of tomogram as indicated in b. j Host fly puparium (NRM-PZ Ar65810). k Volume rendering of j. l Longitudinal section of k. m Volume rendering of host fly (perspective view). n–o Transverse sections of tomogram as indicated in k. Scale bars: a–c, e, f, j–l = 1 mm; g–i, n, o = 250 µm; Quercy Phosphorites Formation, France