Unnamed rock-eating arthropod.

Once more, we have an unnamed zoological sample from the Professor.  This arrived to the offices a few days ago in a brown paper-bag...

On my desk... 

With a moldy tuna sandwich...

The Professor wrote on the bag: "A curious species of arthropod that feeds on minerals and sediment.  Commonly found on the underside of bridges and sometimes in caves.  Have you ever seen the stalactites on the underside of a man-made bridge?  Occasionally, these are among those, hiding in plain sight!  Marvelous adaptation."

"Notice the large tongue and lamprey-like mouth.  The tongue's rough texture and a rather potent enzyme secreted by self-same tongue are what allow it to slurp up a mineral rich soup.  The body is covered in minuscule holes (in pattersn of three, no less, most curious!) that secrete the waste from this process.  The waste is, of course, undigested minerals.  This acts as a protective shell and camouflage.  Brilliant."

Hopefully the next sample he sends won't by in a sandwich bag...