Horseshoe crab
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Horseshoe crabs are arthropods of the family Limulidae and the only surviving xiphosurans. Despite their name, they are not crabs or even crustaceans; they are chelicerates, more closely related to ar
Limulus polyphemus horseshoe crab on coast
Tachypleus gigas
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Horseshoe crabs have two primary compound eyes and seven secondary simple eyes. Two of the secondary eyes are on the underside.
Atlantic horseshoe crab
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The Atlantic horseshoe crab, also known as the American horseshoe crab, is a species of horseshoe crab, a kind of marine and brackish chelicerate arthropod. It is found in the Gulf of Mexico and along
Horseshoe crab
…similar-looking fossil xiphosurans extend back to the Ordovician around 445 million years ago. Only four species of horseshoe crab are extant today, the Atlantic horseshoe crab (Limulus polyphemus), native to the eastern coasts of Mexico and the United States, as well as the mangrove horseshoe crab (Carcinoscorpius rotundicauda…
Limulus polyphemus
Atlantic horseshoe crab on the shore at Brighton Beach, New York City
Atlantic horseshoe crab with attached Crepidula shells on the Delaware Bay beach in Villas, New Jersey.