Morphological and molecular variation reveal cryptic diversity in the racer Philodryas patagoniensis (Girard, 1858) (Squamata: Colubridae)

Osteological characters of the A-morphotype (right side drawings: B, D, F, H) and B-morphotype (left side drawings: A, C, E, G): (A, B) ventral view of the premaxilla; (C, D) dorsal view of nasals; (E, F) ventral view of the parabasisphenoid; and (G, H) dorsal view of the left palatine. Arrows highlight character states (see File S2). Scale bars = 1 mm.