Final answer:
The Jaguar is the largest feline species in the Amazon and is larger than the Ocelot, Puma, and Jaguarundi.
Step-by-step explanation:
The largest feline species found in the Amazon is the Jaguar (Panthera onca). The Jaguar is the third-largest cat in the world, after tigers and lions, and the largest in the Americas. On the scale of feline sizes, the Ocelot, Puma, and Jaguarundi are considerably smaller compared to the Jaguar, which is a top predator within its range, including the Amazonian rainforest ecosystem.