1. Put the horseshoe crab in clean water, wash it with warm water, then put it in boiling water until the body becomes hard, then take it out and let it cool;

2. Put the horseshoe crab into clear water, add appropriate amount of salt, gently stir until the horseshoe crab's body hardens, then take it out and let it cool;

Animal form:

The carapace of the head and chest is horseshoe-shaped, with three longitudinal ridges on the back, with/kloc-0 in the center and/kloc-0 in the front, and/kloc-0 in the two longitudinal ridges. There is a mouth on the ventral surface, and there are 6 pairs of appendages on the edge of the mouth. Except that 1 pair of stinging limbs is composed of 3 segments, the other limbs are all 6 segments. The second pair is the foot whiskers, the larvae and females are chelates, and the males are hooked at the end of 1.

The other four pairs are walking feet, located on both sides of the mouth, with barbs on the basal ganglia, and the distal ganglia of the first three pairs are chelates. The abdominal nail is hexagonal, with notches and short spines on both sides, and six pairs of plate-like appendages on the ventral surface. The appendages are bipedal animals with slender inner limbs and wide outer limbs.

1 The left and right appendages are combined into a cover plate, and there are 1 pairs of reproductive holes under it; The other five pairs have 1 pair of phyllodes behind the outer limbs. There is 1 stiff sword below the abdomen, which is called the tail of the sword.

Horseshoe crabs are distributed in the coastal waters of Taiwan Province Province, China, as well as in Vietnam, Indonesia, Malaysia, the Philippines, Singapore, Thailand, Canada, the United States and Mexico. Inhabits in muddy beaches and shallow water in harbors and estuaries. Horseshoe crabs are generally carnivorous scavengers, and their prey includes clams and worms.

In some seasons of the year, male and female horseshoe crabs gather in the intertidal zone to breed, and the female horseshoe crabs lay 200 or 300 eggs in the sunken part of the beach, which are fertilized by the male horseshoe crabs present. Horseshoe crabs have a long life span and can live to be over 50 years old.

Horseshoe crab is an ancient marine arthropod, which has lived in the ocean for more than 400 million years and still retains its original and ancient appearance, and is known as a "living fossil". Horseshoe crab fossils first appeared in Ordovician, while horseshoe crab fossils similar to modern horseshoe crab fossils appeared in Jurassic. The horseshoe crab has no tail sword, and its body is vertically divided into three parts: the central part and the two sides, much like the larvae of trilobites, which also shows that horseshoe crabs are related to trilobites and are valuable materials for studying the evolutionary history of animals.