Fig. 1 in Phylogenetic Analyses Of Postcranial Skeletal Morphology In Didelphid Marsupials

Fig. 1. Didelphis marsupialis (AMNH 21439) and Metachirus nudicaudatus (AMNH 244617), axis in lateral view. The spinous process (Sp) in Metachirus is posteriorly extended (ch. 10[1]), whereas in Didelphis it is not extended beyond the neural arches (Na) (ch. 10[0]). In Didelphis, the anterior extension of the dens (de) is barely anterior to the anterior tip of the spinous process (ch. 11[0]), whereas in Metachirus the dens is cranialy extended (ch. 11[2]). The ventral tubercle (Vt) is a uniform crest in Didelphis (ch. 14[0]), whereas in Metachirus it forms two protruding lobes (ch. 14[1]). Other abbreviations: As, articular surface; Tc, transverse canal; Tp, transverse process. Scale bars: 10 mm.