The first shot is likely the last thing a lot of small marine planktonic copepods see before the Arrow worm grabs it with those bristles on either side of the head, and then its down the gaping mouth. I posted a few shots of another arrow worm couple weeks ago, but did not get any shots of the ominous looking grasping spines. Netted a few more, so I was able to get some more images... and a cute little bristle worm as a bonus.
(First three) Olympus BHS, 40/0.95 S Plan Apo, DIC, recorded at 88X on Canon T3i sensor.
Olympus BHS, 10/0.40 S Plan Apo, darkfield, recorded at 22X on Canon T3i sensor.
Olympus BHS, 10/0.40 S Plan Apo, "strong" oblique brightfield, recorded at 22X on Canon T3i sensor.
Images made through a microscope. All subject types.