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Key terms: eyes horseshoe crab blood legs pairs limulus species mouth female tail eggs gills population shells lal carapace oxygen bait contains underside remaining marine delaware atlantic whelk conch animals spring arthropods visual red knot bacterial prosoma extinct five pairs harvesting simple eye modified ommatidia migration creatures compound eyes hemocyanin endangered blood cell limulus polyphemus crab population conservation million years ago pairs of appendages Search external links cited by footnotes on Wikipedia page Horseshoe crab: |
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