The Origin of the P3 Pattern of Sylvilagus, Caprolagus, Oryctolagus and Lepus

摘要: An Upper Pliocene population of Nekrolagus progressus (Hibbard) represented by 178 P3s from the Rexroad fauna has 11.8% individuals with a P3 enamel pattern that is like Ps Sylvilagus, Caprolagus, Oryctolagus and Lepus . For first time in fossil record there evidence for place variation (mutation) within produced character generic grade. It proposed this developed North America gave rise to now found Cenozoic faunas Eurasia contain remains are younger than fauna. Over 2,000 Recent Lepus, Sylvilagus dentitions were examined. Twelve specimens these three genera contained pattern. The quite recent origin. These rabbits provide an excellent group comparative study late establish rate development. A phylogenetic summary given show relationship Leporinae as based upon development P2 P3.