If you tame this creature, it’s more added to taming a quetzal, put it on aggressive and make it spit out the acid, ride on your argh first to give the arthropleura a chance to spit, then take out the quetzal with tranq. Vote for Dododex to see
Not exactly the best combat mount, slow, stamina isn't the best, a little squishy. But a few high levels of these on base defence are pretty good. Put a few in the inner parts of your base (along with the spiders to slow them down) and the will have your enemies armour being melted in seconds!