A dark field close up of the Ragworm Nereis showing the jaws that now lay in side the body byt they can be extended. Polychaetes have all types of mouthparts. I have also seen vacuum cleaner types of extendable mouthparts
Thanks for these pictures, Wim. I had completely misinterpreted the part about jaws in your earlier posting -- I was thinking that the jaws were at the very bottom of the picture, sort of like spider fangs.