A, Shamosuchus ulanicus (= Paralligator gradilifrons) (PIN 3140-502), dorsal view; B, PIN 3140-502, ventral view; C, line drawing of PIN 3140-502, dorsal view; D, line drawing of PIN 3140-502, ventral view; E, S. tersus (= Paralligator gradilifrons) (PIN 3141-501), dorsal view; F, line drawing of PIN 554-1, dorsal view; G, S. ancestralis (= Paralligator gradilifrons) (PIN 551-29/1), dorsal view; H, line drawing of PIN 551-29/1, dorsal view. Abbreviations: bo, basioccipital; bs, basisphenoid; d, dentary; f, frontal; j, jugal; la, lacrimal; m, maxilla; n, nasal; ot, otoccipital; pa, parietal; pf, prefrontal; pl, palatine; pm, premaxilla; po, postorbital; pt, pterygoid; q, quadrate; qj, quadratojugal; sq, squamosal.