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Lithobates Rexroadensis
''Lithobates'', commonly known as the bullfrogs, is a genus of true frogs, of the family Ranidae. The name is derived from ''wikt:lith-, litho-'' (stone) and the Greek ' (, one that treads), meaning one that treads on rock, or rock climber. As presently defined, it includes many of eastern North America's most familiar aquatic frog species, including the American bullfrog, Lithobates clamitans, green frog, and the Leopard frog, leopard frogs. Systematics The name was defined by Hillis and Wilcox (2005) for a subgenus of four Central America, Central and South American frogs within the genus ''Rana (genus), Rana''. The subgenus was subsequently expanded to seven species in Central and South America in a systematic revision of the genus ''Rana''. The name was previously used by Frost ''et al.'' as a separate genus of ranid frogs that included most of the North American frogs traditionally included in the genus ''Rana'',Frost, Darrel R. (2006): Amphibian Species of the World Versio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Early Miocene
The Early Miocene (also known as Lower Miocene) is a sub-epoch of the Miocene epoch (geology), Epoch made up of two faunal stage, stages: the Aquitanian age, Aquitanian and Burdigalian stages. The sub-epoch lasted from 23.03 ± 0.05 annum, Ma to 15.97 ± 0.05 Ma (million years ago). It was preceded by the Oligocene epoch. As the climate started to get cooler, the landscape started to change. New mammals evolved to replace the extinct animals of the Oligocene epoch. The first members of the hyena and weasel family started to evolve to replace the extinct ''Hyaenodon'', entelodonts and bear-dogs. The chalicotheres survived the Oligocene epoch. A new genus of entelodont called ''Daeodon'' evolved in order to adapt to the new habitats and hunt the new prey animals of the Early Miocene epoch; it quickly became the top predator of North America. But it became extinct due to competition from ''Amphicyon'', a newcomer from Eurasia. ''Amphicyon'' bested ''Daeodon'' because the bear-dog's la ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |