Figure 1

Digital reconstructions of Massospondylus carinatus embryonic skulls based on SRµCT data. (A) composite of Massospondylus carinatus embryonic skulls in left lateral view. (B) composite of Massospondylus carinatus embryonic skulls in ventral view. (C) composite of Massospondylus carinatus embryonic skulls in dorsal view. (D) composite of Massospondylus carinatus embryonic skulls in anterior view. (E) composite of Massospondylus carinatus embryonic skulls in posterior view. (F) Massospondylus carinatus Embryo 2 skull reconstruction as preserved in dorsal view. (G) Massospondylus carinatus Embryo 2 skull reconstruction as preserved in ventral view. (H) Massospondylus carinatus Embryo 1 skull reconstruction as preserved in lateral view. (I) Massospondylus carinatus embryonic null-generation tooth. (J) Massospondylus carinatus functional embryonic tooth. Abbreviations: a, angular; bs, basisphenoid; d, dentary; ect, ectopterygoid; fr, frontal; j, jugal; la, lacrimal; mx, maxilla; n, nasal; pa, parietal; pf, prefrontal; po, postorbital; pmx, premaxilla; pt, pterygoid; sa, surangular; sp, splenial; sq, squamosal; q, quadrate; qj, quadratojugal; v, vomer.