David;-
    On S. Car. beaches, I have found several horseshoe crab carapaces with
Euplura on them. On removing them, I have not found holes or other damage. Maybe
they just go for the ride.
        Art

David Kirsh wrote:

> A couple of days ago at the boat ramp for Cocoa Beach, I spotted a
> copulating couple of horseshoe crabs skittering in the shallows. I looked
> closely and found that there were four sharp-ribbed drills (Eupleura
> caudata) perched on the female's dorsum.
>
> What were those drills up to?
>
> This question has me alternately searching for a serious answer or a perfect
> punchline.
>
> David Kirsh
> Durham, NC