Horseshoe Crabs: Merostomata - Physical Characteristics, Habitat, Diet, Behavior And Reproduction, Horseshoe Crabs And People, Horseshoe Crab (limulus Polyphemus): Species Account - GEOGRAPHIC RANGE, CONSERVATION STATUS
eastern threatened world
Horseshoe crabs inhabit coastal regions of eastern North America and the Indo-Pacific. Of the four species of horseshoe crabs in the world, just one is found along the eastern and Gulf coasts of the United States.
The World Conservation Union (IUCN) lists just one species of horseshoe crab as Near Threatened, meaning that they are at risk of being threatened with extinction in the future. All horseshoe crab populations are thought to be declining worldwide owing to harvesting, or gathering by humans, and habitat destruction.
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Adults horseshoe crabs range in length from 3.5 to 33.5 inches (89 to 850 millimeters). The females are larger than the males. Horseshoe crabs have a large, arched forebody covered by a horseshoe-shaped carapace (KARE-a-pays), or upper shell, followed by a smooth abdomen with spines on the sides, and a thin tail. There are two pairs of simple eyes, or eyes with one lens, on top of the carapace and…
Horseshoe crabs live just offshore along the coast or in salty estuaries (EHS-chew-air-eez), the wide parts at the lower ends of rivers, where the river meets the sea. They prefer coves and bays, which are small inlets of the sea, or wetland, meaning land that is covered with shallow water or that has very wet soil. The crabs like clean, sandy bottoms or muddy bottoms protected from strong wave ac…
Every spring and summer adults migrate (MY-grayt), or move, from deeper waters onto nearby beaches to mate and lay eggs, or spawn. Spawning occurs at high tide on the beaches of estuaries, bays, and coves. One species swims upstream into rivers to spawn. A male grasps the edges of the female's shell with his clawed legs, while the female digs a hollow in the sand with her legs and the front…
Physical characteristics: The horseshoe crab, also known as American horseshoe crab, is greenish brown to blackish brown. Males are smaller than females. The average body length of males is 14 inches (356 millimeters) and of females is 17 inches (431 millimeters). Geographic range: The horseshoe crab inhabits the Atlantic and Gulf coasts of North America, from Long Island to the Yucatán pen…
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