Perrin et al.: Geographic variation in cranial morphology of Stenella attenuata 



331 



0.00 



0.25 



 



Correlation 

 0.50 



rC 



■5 



1 Condylobasal L 

 30 L. Ramus 



3 L Rostrum(frm. Pterygoid) 



2 L Rostrum(frm.Base) 



22 I. Up. Toothrow 



27 L Low Toothrow 



28 Ht. Ramus 



4 w. Rostrum(at Base) 

 5W. Rostrum(at 1/4 L) 

 6W Rostrum(at1/2L) 



8 W. Rostrum(at 3/4 L) 

 7W. Premax(at 1/2L) 



9 Preorbital W. 

 10Postorbital W. 



1 1 Skull W.(at Zygomatic P.) 



20 L Antorbltal P. 

 15 Max. W. Premax. 

 19 Orbital L 



21 W. Internal Nares 



1 7 L. Temporal Fossa 



1 8 W. Temporal Fossa 



12 Skull W.(at Panetals) 



13 Ht. Braincase 



14 L. Braincase 



23 No. Teeth(Up.Lf) 



24 No. Teeth(Up.Rt) 



25 No Teeth(Low Lf ) 



26 No Teeth(Low Rt.) 



29 Tooth W, 



16W. External Nares 



Figure 2 



Correlations among characters based on character means for 29 latitude-longitude blocks. 

 Clustering performed using UPGMA on absolute correlations among characters (i.e. 

 negative signs removed). Cophenetic correlation coefficient is 0.87. 



1.0- 



0.5 



E 

 o 

 O 



0.0 



-0.5 



-1.0 



n 05io  



 0314 

 .0409 





 0509 



-1.5 



-1.0 



-0.5 



0.0 0.5 



Component I 



1 



1 5 



2.0 



Figure 3 



Projections of blocks onto first two principal components based on 30 char- 

 acters. Solid symbols indicate 29 latitude-longitude blocks on which analy- 

 sis was conducted. Open symbols represent blocks with only single specimens 

 projected onto axes generated from 29 blocks with two or more specimens. 



