Imagine after downloading the shoot and have this pop up on a big monitor while editing. The small details aren't always obvious in the view finder, a surprise often shows up.

I've just been told in the Entomo-L by Ed Saugstad "that those are spiracular plates, the external portion of the larva's respiratory system. All higher diptera larvae have these to some degree they can vary greatly in appearance), and they often are used by dipterists to help identify larvae either to species or to larval stadium."
Amazing shot, congratulations.

for the info, makes sense since aquatic syrphids have breathing tubes on the posterior. The obvious seems to become obvious only after someone points it out (obviously). Still resembles someone I know, ;)>.