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These relics from a bygone era, whose arrival preceded the dinosaurs, have been dwelling in the deep for 450 million years.
Although deceptively named a horseshoe crab, it is in fact an arthropod, as community science manager at Delaware Center for the Inland Bays, Nivette Perez-Perez, outlines.
Beginning in the 1970s, the biomedical industry's found a special component limulus amebocyte lysate, extracted from their blood, invaluable.
Vital for detecting bacterial endotoxins, which can contaminate medications, needles, joint replacements and vaccines, demand for horseshoe crab blood has surged in recent years.
Horseshoe crab advocate Glenn Gauvry's president of the Ecological Research and Development Group.
With somewhere in the region of half a million horseshoe crabs being harvested and bled for this chemical a year, challenges arise.
In addition to the 15 percent of these which never recover, wider threats to their existence reinforce the necessity for an effective horseshoe crab blood substitute to be developed.
Although Swiss biotech company Lonza's synthesised an effective alternative, recombinant factor C, this compound is yet to receive regulatory approval.
Until then, the horseshoe crab's Delaware spawning grounds will remain under close scrutiny by passionate local volunteers.
Delaware Department of Natural Resources education coordinator Laurel Sullivan describes the scene.
