Pleistocene Mammals Central Florida 75 



Order Cetacea 



Family Delphinidae 



cf. Tursiops 



Material— Vertebra (UF 48976). 



Remarks. — The specimen is a complete centrum (diameter = ca. 38 

 mm) with one complete transverse process (length = ca. 75 mm). The 

 paired portion of the neural arch ventral to its fusion into the spine is 

 present. Comparison with modern small odontocetes from Florida sug- 

 gests Tursiops. The relatively intact nature of this specimen, and the 

 lack of water-wear, suggests in situ deposition and comprises further 

 evidence of marine transgression above the Rock Springs elevation. 



Order Carnivora 



Family Canidae 



Urocyon cinereoargenteus (Schreber) 1775 



Material.— Distal humerus (UF 49000). 



Remarks. — This specimen resembles humeri of modern individuals 

 of the gray fox from central Florida. 



cf. Canis dirus Leidy 1858 



Material. — Canine fragment (V-4397). 



Remarks. — This identification follows Webb (1974). 



Family Ursidae 



Tremarctos floridanus (Gidley) 1928 



Material— Molar fragment (UF 8946); 2 upper M3's (UF 8947- 

 8948). 



Remarks. — The genus is extinct in North America, with the sole 

 living species restricted to the South American Andes. Tremarctos flori- 

 danus, the Florida spectacled bear, was a common member of many of 

 Florida's Pleistocene faunas; Ursus and Tremarctos remains are often 

 found in the same deposits. Ecological differences of the two species 

 apparently allowed coexistence (Kurten 1966). Adaptation of T. florida- 

 nus to a highly herbivorous lifestyle is evident from its relatively broad 

 molars, which allowed for increased occlusal surface areas. The rela- 

 tively narrow and elongate molars of U. americanus indicate more 

 omnivorous adaptation. 



