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Horseshoe crabs are arthropods of the family Limulidae and the only surviving xiphosurans. Despite their name, they are not true crabs or even crustaceans; they are chelicerates, more closely related to arachnids like spiders, ticks, and scorpions. The body of a horseshoe crab is divided into three main parts: the cephalothorax, abdomen, and ...
Atlantic horseshoe crabs in Mexico, such as this pair at Holbox Island, mostly breed in lagoons with mangrove and seagrass [4] The Atlantic horseshoe crab is the only extant (living) species of horseshoe crab native to the Americas, although there are other extinct species only known from fossil remains from this region. The other living ...
Xiphosurans move to shallow water to mate. The male climbs onto the back of the female, gripping her with his first pair of walking legs. The female digs out a depression in the sand, and lays from 200 to 300 eggs, which the male covers with sperm. The pair then separates, and the female buries the eggs. [10]
It is a distinctive feature of the subphylum Chelicerata (arachnids, horseshoe crabs and others). Although it is similar in most respects to an abdomen (and is often referred to as such), the opisthosoma is differentiated by its inclusion of the respiratory organs ( book lungs or book gills ) and the heart .
A ‘hauntingly beautiful’ image of horseshoe crab and a beached orca taking its final breaths were among the winning images of the Wildlife Photographer of the Year 2023 competition.
The tri-spine horseshoe crab is the largest of the living horseshoe crab species. [8] Like the other species, females grow larger than males. The largest females of the tri-spine horseshoe crab can be as much as 79.5 cm (31.3 in) long, including their tail. [9]
Leading scientists also have denounced the commission’s computer model, which recommends harvesting 175,000 female horseshoe crabs and 500,000 male horseshoe crabs for bait annually.
From the proximal end (where they are attached to the body) to the distal, they are: the coxa, the trochanter, the femur, the short patella, the tibia, and the tarsus. In spiders, the coxae frequently have extensions called maxillae or gnathobases, which function as mouth parts with or without some contribution from the coxae of the anterior legs.