420 CLASSIFICATION OF THE CETACEA 



d Dolphins in the stricter sense {Delphinidae sensu stricto) Miocene- 

 Recent. Generally clear dorsal fin. Some cervical vertebrae 

 generally fused. Conical teeth. Beak often present. 



1 Kentriodon, Delphinodon. Miocene types clearly distinct from 

 present types. Pliocene types resemble recent types more 

 strongly. 



2 Killer Whale [^Orcinus orca (L.) ], 30 ft. Universal. 



3 False Killer [Pseiidorca crassidens (Owen) ], 16 ft. Universal. 



4 Irawadi Dolphin [Orcaella brevirostris (Owen)], 7 ft. S.E. Asia. 



5 Pilot Whale [Globicephala melaena (Traill) ], 26 ft. Universal, but 

 represented by different species in different areas. Gl. melaena in 

 N. Atlantic and Mediterranean probably identical with Gl. 

 leucosagmophora from all waters south of 30° S. and Pacific coast 

 of S. America; Gl. macrorhyncha Gray from Virginia to West 

 Indies; Gl. scammoni Cope in N. Pacific. 



6 Risso' s Dolphin [Grampus griseus C>\xv.^, 10 ft. Universal. 



7 Bottlenose Dolphin (U.S.A.: Common Porpoise) [Tursiops 

 truncatus (Mont.) ], 12 ft. Probably universal; different strains 

 and species; T. aduncus Ehrenberg in Red Sea and east Indian 

 waters. 



8 Common Dolphin [Delphinus delphis L.], 7 ft. Universal but not in 

 very cold waters. 



9 White-Sided Dolphin [Lagen or hynchus] 5 ft.- 10 ft. L. acutus (Gray) 

 (White-sided Dolphin) and L. albirostris Gray (White-beaked 

 Dolphin) in N. Atlantic; L. obliqiddens Gill in N. Pacific; L. 

 electra Gray in the tropics; L. cruciger (Quoy and Gaim) with a 

 number of strains, in southern waters. 



10 Stetiella {Prodelphinus) . A number of species between 50° N. and 

 40° S. Mostly tropical. 3^-8 ft. 



11 Rough Toothed Dolphin [Steno bredanensis (Lesson) ], 8 ft. Warmer 

 waters. 



12 Cephalorhynchus. 3^ ft. -6 ft. Southern w^aters. Various species. 



13 Right Whale Dolphins [Lissodelphis], 5 1 ft. -8 ft. Two species 

 respectively N. Pacific and Southern seas. 



14 Sotalia. 3-8 ft. Tropics and sub-tropics; generally in rivers and 

 estuaries. 



15 Slender Blackfish [Feresa^^ , 8 ft. Pacific and S. Atlantic (Australia ?) . 



