Van Waerebeek: Variation in skull morphology of Lagenorhynchus obscurus 



763 



CH NZ PE 5m 

 Condylobaeal length 



CH N2 PE SA 

 Rostrum length 



CH NZ PE SA 



Rostrum width at baa 



CH NZ PE SA CH NZ PE SA 



Roatrum tip to external nares Rostrum tip to internal nares 



CH NZ PE SA 



Praorbital width 



CH NZ PE SA 



Poatorbital width 



CH NZ PE SA 

 Zygomatic width 



CH NZ PE SA 

 Pariatal width 



CH NZ PE SA 



Grsataet width premaxillary 



CH NZ PE SA 

 External nares width 



CH NZ PE SA 



Temporal fona width 



Figure 2 



Comparison of means in cranial measurements (in mm) and meristics for adult Lagenorhynchus obscurus 

 from Chile (CHl. New Zealand (NZl, Peru (PEi and southwestern Africa (SA). Error bars are 95 1 * 

 confidence intervals for means. 



frequencies of NMC character states in skulls from 

 Peru (iV=221), Chile (iV=40), New Zealand (iV=69), and 

 southwestern Africa (Af=65). Surprisingly, only three 

 characters out of 22 ( 14% ) were found to demonstrate 



significant differences between geographic groups (chi- 

 square contingency analysis; see Table 10). These are 

 relative position of the foramen in the right premaxil- 

 lary at the base of the prenarial triangle (variable 1R, 



