These creatures do not have -containing protein , which is the basis of transport in.
The horseshoe crab is not really a crab.
However, that is not to say they have not evolved at all since there is no evidence that changes may have occurred in the soft tissue and biochemical mechanisms that cannot be studied in typical fossils.
Retrieved March 28, 2010.
Females can grow up to 60 cm 24 in in length, including tail, and 4.
The pedipalps on a male change shape on their terminal molt, becoming boxing glove-like claspers that are used for grasping the female during mating.
Horseshoe crabs have been around for more than 300 million years, making them even older than dinosaurs. They look like prehistoric crabs, but are actually more closely related to scorpions and spiders. The horseshoe crab has a hard exoskeleton and 10 legs, which it uses for walking along the seafloor.
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. Natural history
Horseshoe crabs ( Limulus polyphemus) are an integral part of the marine ecosystem and significant natural resource in many coastal national park units. As a member of the benthic community, they prey on small benthic fauna, such as bivalves and worms. They are preyed upon by sharks, as well as the federally listed loggerhead sea turtle.
A Horseshoe Crab is a crab-like creature in the Limulidae family. They have rounded bodies, which have a horseshoe-like shape when viewed from their undersides. People commonly use these creatures as a food source, as fertilizer, bait, and even in scientific research. Read on to learn about the Horseshoe Crab.
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