46 



10 mm 



Fig. 25: Lionycteris spurelli, skull a: lateral view, b: basal view, c: dorsal view, d: frontal view 

 Skiill descriptions of the single genera 



Lionycteris (fig. 25) 



L spurrelli: Skull: rostnmi relatively short, approximately limited to one third of total 

 length; distally flat and tapering. In lateral view, tlie upper incisivi continue tlie outline 

 straightly. 



In basal view the palate is pomtedly trapezoid, width over the last molars considerably 

 exceeds the distance of the canmi to each other. Choanae situated quite anterior with the 

 palate reachmg only half the basal length. Praesphenoid outlined but without ridge, 

 basisphenoid witli strong convexities (basisphenoid pits). Pterygoids witli hamuli ending 

 shortly and pointedly, no pterygoid wings. No zygomatic arches. 

 Teeth: dental formula - 2 3 1 - - 3 4 5 6 7 



12-1-234567 



Incisivi present m the upper and lower jaw; the upper ones being orientated anteriorly, 

 iimer incisivi considerably larger than outer ones, long and spatular, with smooth edge, the 

 outer ones only one tliird the size, pointedly trapezoid ("tomahawk"), producing an oblique 

 edge which complements with those of the hmer incisivi to an edge formed like a 

 horseshoe. 



Canmi strong, with cingulimi. Premolars canmifomi, anterior premolar separated from 

 canine tooth by distmct diastema. Molar teeth quite strong with broad crowns and 

 dilambdodont ectoloph; anterior molar larger than the middle one, tlie posterior one being 

 the smallest. Lower incisivi of same size, forming a closed row between the canini. 



Lonchophylla (figs. 26-28) 



Skull: similar to Lionycteris; in smaller forms the rostrum is distinctly less than half of the 

 total skull length, in larger species ahnost half of it. Skull laterally stretched, only weak 



