horseshoe crab

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horseshoe crab

(hŏrs′shoo″, hŏrsh′oo krăb)
Limulus polyphemus, a species of saltwater arthropod that is a member of the Chelicerates, the subphylum containing scorpions and spiders, rather than the Crustaceans, the subphylum containing true crabs. The Limulus body structure has remained nearly unchanged for 450 million years, longer than almost any other living animal. Its blood is blue rather than red because oxygen is carried by a copper-based compound rather than hemoglobin, which is an iron-based compound; Limulus blood is used in testing drugs for bacterial contamination.
References in periodicals archive ?
Old English Mulled Punch (Serves 8) 2 sweet apples, cored and coarsley chopped 2/3 cup pineapple tidbits, packed in unsweetened pineapple juice 1-1/2 cups unsweetened pineapple juice 2 cups unsweetened apple juice teaspoon cardamon seeds, lightly crushed 2 cinnamon sticks 8 whole cloves 4 cups strong mint herb tea 3 tablespoons unfiltered honey Combine first 8 ingredients in sauce-pan.