The species M. lahayishupup of North America was also quite large; fossil humerus bones measuring attributed to the species suggest that this cat was far larger than a modern lion, which has a humerus. It is estimated to have weighed between 241 and 348 kg, with a mean weight of 277 kg; one particularly large specimen was estimated to weigh 410 kg. Until its discovery, no true species representative of the genus Machairodus had been described from North America, as they had been reassigned to other genera, such as Nimravides and Amphimachairodus. Its presence in North America suggests that either there was a widespread population of this genus of cat throughout Africa, Eurasia and North America or simultaneous instances of independent evolution in machairodonts on multiple continents during the Miocene.
The species M lahayishupup of North America was also quite large; fossil humerus bones measuring attributed to the species suggest that this cat was far larger than a modern lion which has a humerus It is estimated to have weighed between 241 and 348 kg with a mean weight of 277 kg; one particularly large specimen was estimated to weigh 410 kg Until its discovery no true species representative of the genus Machairodus had been described from North America as they had been reassigned to other genera such as Nimravides and Amphimachairodus Its presence in North America suggests that either there was a widespread population of this genus of cat throughout Africa Eurasia and North America or simultaneous instances of independent evolution in machairodonts on multiple continents during the Miocene