Warrior Cast Earth Reptiles (the ones in Hungry Earth) have the added biology of a venom sacks and flexible tongues to deliver said venom. Thus they have an In built weapon so whilst their foes have no weapons they thus end up far more deadly than the rest.

Silurians have their long poisonous tongues

Does a Myrka count as weapons or equipment?

Yeah, it wouldn't be used here.

Why would they be fighting? Aren't they all on the same side?

@Kevin 'Chalky' Kaiba why do Humans fight? The Earth Reptiles have never been unified and have over their history suffered many of the same strifes and conflicts humanity has. They are not all on the same side in much the same way that not all humans are on the same side,