FIGURE 2. ETMNH 3852, Ambystoma sp. atlas in (1) dorsal, (2) ventral, (3) left lateral, and (4) anterior views. Osteological abbreviations: AtC, atlantal cotyle; Hyp, hyperapophysis; NC, neural canal; NR, neural ridge; OP, odontoid process; Pozyg, postzygapophysis.