An Irvingtonian species of Brachylagus (Mammalia: Lagomorpha) from Porcupine Cave, Park County, Colorado
Abstract
Abstkact. -Bracliijla^us i.s ciiircntK a inonotNiiic ^I'liu.s ol unct'itaiii oiitiiiis and known only from Iloloccne and late Raiicholabrean. A new species ot leporid is clescrii)ed from the early and middle Pleistocene (Irvinj^tonian) deposits of Poreiipine Cave, Park CountN; Colorado. Stratified deposits of the Pit and the Velvet Room, 2 localities within Porcu-I)ine Cave, have been dated hiochronologieally and paleomagnetically from the middle Irvinj^tonian and early to middle Iningtonian, respectively. Brachijla<>.u.s colorudoensis, sp. now, is characterized by its conserved p3 enamel jiatterns which are intermediate between B. idahoeusis and Hypohifius, and its size which is slightly larger than that of B. idahoeusis. This snggests a possible ancestral relationshiji between Ihjpolanus and Br(ichi/la<^iis.
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