90 



of its different construction - comes up to values which would have been expected for 

 Choewnisciis. Tliis manifests itself by intrageneric allometrical calculation of a common 

 random sample comprising C. mexicana and C. hatrisoni (fig.69): they significantly differ 

 from Choeroniscus both in tlie gradient and in tlie distribution ellipse (p<0.05). 

 Length of mandible (UKL): Allometric regression of this measure to the reference 

 quantity SIZE results m similar groupings: once more, Brachyphylla and Phyllonycteris 

 approach the allometric line (reduced major axis) of the outgroup (Carollia and 

 Phyllostomus). In this parameter, the mean values of Erophylla differ from Phyllonycteris 

 by a mandible length with proportions resembling those of the remaining basic 

 glossophagines and lonchophyllines. 



Furthemiore, the integration constants of Choeroniscus, Hylonycteris and Choeronycteris 

 are more distant from the outgroup. In this parameter even Platcilina matches distances to 

 the outgroup usually applying to extremely long-skulled bats (fig. 70, tab.8), subsequently 

 following the allometries calculated for the genus Lonchophylla. 



284. 067 511.084 919.527 1654.385 2976.51 



Fig.70: Relation SIZE to mandible length: comparison between Clioeroniscus (+) and Lonchophylla 

 + Platalina (□) 



Once more, Musonycteris sticks out witliin this comparison. Though it is about the size of 

 Platalina, it shows a distictly more elongate mandible, in this respect even exceeding 

 Choeronycteris mexicana by far. 



Coronoid height (CH): In the double logaritlmiic representation of regression of coronoid 

 height to SIZE, the situation is reversed: the Ramus mandibularis is strongest within the 

 outgroup members and in the individuals with tlie relativly longest rostra, the rami of the 

 mandible are more flattened. Thus, the reduced major axis of the outgroup runs above, 

 and deviations of individual genera are represented by positive values in tlie table (fig.54). 



