Mega fauna and flora on a super earth

I am working on a super-earth, about 1.5 more massive than Earth. On this planet, there's a large variety of megafauna and flora across the world. The biggest trees over there can grow to be 36 meters tall. Giant long-necked herbivores that live near rivers feed off tall trees and their backs are like living ecosystems for smaller animals. Aggressive insectoid predators, about 9 meters tall, lurk in the forests (when I say insectoid, I mean that they simply look like insects, while they're actually vertebrates). Apart from that the biggest flying creature there has a wingspan of 20 meters, which is about 2 times bigger than the biggest flying animal on Earth, Quatzocoatlus. Now, the question is: How can creatures this large exist on a planet with stronger gravity? One possible solution that I thought of was if the creatures' bones were composed of carbon nanotubes, but I'm not really sure if that's biologically possible. What do you think?

Edit: Just to clarify, the gravity of this world is 1.5g

posted over 4 years ago

Johnara‭

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