Coleopterist
/ˌkəʊliˈɑːptərɪst/
Definition 1 of 1
Pro Tip 1/3Subject Specific
Used mainly in scientific contexts or when talking about insect studies. 
She presented her findings at the coleopterist conference.
Pro Tip 2/3Not a Hobbyist
Implies extensive knowledge in beetles, more than just a hobby. 
He's a renowned coleopterist with several species discoveries.
Pro Tip 3/3Academic Pursuit
Often associated with formal education or academic research. 
After her PhD, she became a professional coleopterist.