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Found on Acacia origena tree in Al Baha region, Saudi Arabia
Juniperus procera forest area
Hello and Welcome to Project Noah! Your longhorn beetles (like all insects) are Arthropods. I moved your spotting to that category for you. :-)
This is probably the most comprehensive site near you:
http://www.nature-of-oz.com/cerambycidae...
Cerambycidae, Longhorn Beetle. Ubnfortunately there are very few resources about Saudi Arabia.