What is this shrimp?

This was sold to me as an amano shrimp. When I first got a closer look at it I thought it was a low grade neocaridina as it had a few patches of darker pigment, but now it is pretty much all darker cryptic colored. I noticed these vibrating things next to its face while it's eating that my other shrimp don't have - is this some other kind of caridina shrimp maybe? Or is it a parasite at work?