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  7. Merostomata  7 Sites
The Merostomata includes two distinct groups of marine organisms, the eurypterids (an extinct group that lived 200 to 500 million years ago) and the horseshoe crabs. The horseshoe crabs are also an ancient group; only 4 or 5 species (depending on who is counting) exist today.
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The Horseshoe Crab - Limulus polyphemus - Promotes public awareness of the four remaining species. Natural history, conservation, medical uses, education, sightings, stories, images, glossary, and bibliography. The Horseshoe Crab - Limulus polyphemus - Brief profile of species biology and ongoing research, with a photo. Horseshoe Crabs: The Ancient Mariner - Information on these crabs, which have evolved little in the last 250 million years, their behavior and mating ritual. The Amazing Horseshoe - Information on these crabs, family Limulidae, their anatomy, life cycle, ecological niche, spawning and medical uses. It's all about the Horseshoe Crab - Videos, pictures and informative articles for the preservation and understanding of the American horseshoe crab. Horseshoe Crab: Limulus polyphemus - Photographs and information from ARKive including classification, status, description, range, habitat, biology, threats and conservation. Merostomata - Brief description of the class, from the Animal Diversity Web.
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