OK, so we are at the dreaded letter "Q". Did you have as difficult of time as I did with this letter? No matter what theme I thought about, the Q was always my problem letter. It was a stretch but here we go for today.
A Quinticlave is in the Ophicleide family, conical bored, brass keyed bugles. The Ophicleide was invented in 1817 and was later succeeded by the tuba and euphonium. The word Ophicleidi is Greek for "serpant" and "keys".
I couldn't find any videos and this is the only picture I could find that might be what it looks like. This has been a learning experience for me too. Have you ever heard of a quinticlave???