22 facts about Horseshoe crab

Horseshoe crab
11.Horseshoe crab has 10 eyes, including a pair of multi-lens eyes.
There are 1000 lenses in multi-lens eyes. In addition to the eyes, horseshoe crabs also have photoreceptors on the telson. They can see perfectly in very dark conditions because their cones and rods in the eyes are the largest of all animals, 100 times larger than in humans.
12.They feed on clams, polychaetes, small fish and decayed organic debris.
The mouth opening is located on the underside of the body between the legs. They move the food into the mouth with chelicerae—a pair of small appendages.
13.Like many crustaceans, the blood of the horseshoe crab is blue.
Hemocyanin is responsible for the transport of oxygen in these animals.
14.Horseshoe crabs breathe using book gills.
This organ is made of gills covered with large surface area for absorbing oxygen. It's located in the rear part of the animal body between the legs and the telson.
15.The blood of the horseshoe crab shows a very interesting feature that is used in the biomedical industry.
Due to the environment in which these animals live, which is full of Gram-negative bacteria, their immune system is sensitive to the endotoxins of these microbes. When exposed to endotoxins, horseshoe crab blood coagulates, leading to the formation of a clot. That is why their blood is harvested for microorganism detection tests production. Those tests allow even small amounts of bacteria to be detected in a short time.
16.Blood is being extracted from living animals.
It is estimated that between 10% and 30% of the animals do not survive the process. Approximately 500,000 horseshoe crabs are harvested for blood annually.
17.They are caught and used as bait to catch eels.
Scientists have been able to isolate a substance from the horseshoe crabs organism that is responsible for attracting eels, but it has not been synthesised yet.
18.The female is able to lay 60 to 120 thousand eggs at a time.
Spawning takes place in late spring and early summer. In addition to the male attached to the female, there may be other males around the copulating pair who are also involved in egg fertilization.
19.Horseshoe crabs are animals that are most active at night.
20.The blood of these arthropod is sterile, which means it has no microorganisms in it.
Horseshoe crab
22 facts about Horseshoe crab

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