Plot of the first two Canonical Variates resulting from CVA of 24 landmark coordinates of the occlusal enamel pattern of the upper premolars (P3/P4).

<p>Shown on the margins of the graph is the change in tooth shape along each corresponding axis. The groups included in the analysis are: 1) large specimens from Cedral, Mexico (Cl); 2) medium specimens from Cedral (Cm) as well as all teeth from San Josecito Cave (J), Mexico; 3) small specimens from Cedral, Mexico (Cs); 4) large specimens from different localities of the American Southwest (identified by a lower case “l” beside the specimen symbol; refer to <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0183045#pone.0183045.g001" target="_blank">Fig 1</a> for locality names); 5) medium specimens from different localities of the American Southwest (identified by a lower case “m” beside the specimen symbol; refer to <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0183045#pone.0183045.g001" target="_blank">Fig 1</a> for locality names); 6) medium specimens from Natural Trap Cave, Wyoming (N); 7) large specimens from Natural Trap Cave, Wyoming (Nl); 8) large specimens from the Edmonton area gravel pits (E) and Wally’s Beach (W), Alberta; and 9) all of the specimens digitized from Bluefish Caves, Yukon (B). A lower case “a” beside the specimen symbol indicates a tooth that yielded aDNA (these include EQ38 and EQ45 from Bluefish Caves). An asterisk (*) beside the specimen symbol denotes a tooth associated (i.e., it belongs to the same individual) with a specimen from which aDNA was obtained (including teeth associated with EQ3 from Dry Cave, New Mexico, EQ9 from Natural Trap Cave, EQ43 from Wally’s Beach, and EQ44 as well as EQ47 from Bluefish Caves). Table A in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0183045#pone.0183045.s002" target="_blank">S2 File</a> lists all of the specimens included in this analysis.</p>