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Limulus is a genus of chelicerates with one living species, the Atlantic horseshoe crab, and one fossil species from the Late Cretaceous. Learn about its scientific classification, synonyms, and doubtful and tentative species.
Horseshoe crabs are ancient arthropods that resemble crabs but are not true crustaceans. They have four living species, mostly marine, and are used for their blood, bait, and food.
Learn about the Atlantic horseshoe crab (Limulus polyphemus), a marine and brackish arthropod related to spiders and scorpions. Find out its anatomy, physiology, distribution, ecology, and conservation status.
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Learn about the ancient and fascinating horseshoe crab, a relative of spiders and scorpions that lives on the Atlantic coast of North America. Discover how its blue blood is used for medical testing, how it mates and spawns, and what threats it faces.
Aug 5, 2021 · A 310-million-year-old fossil from Illinois shows the internal organs of a horseshoe crab, including its brain. The brain structure of the ancient crab is nearly identical to that of living species, suggesting little evolutionary change in this aspect.
There are four living (or, extant) species of horseshoe crabs. Limulus polyphemus lives in the western Atlantic Ocean, while Tachypleus tridentatus, Tachypleus gigas, and Carcinoscorpius rotundica are Asian species.
Aug 13, 2024 · horseshoe crab, (order Xiphosura), common name of four species of marine arthropods (class Merostomata, subphylum Chelicerata) found on the east coasts of Asia and of North America. Despite their name, these animals are not crabs at all but are related to scorpions, spiders, and extinct trilobites.
