Also known as horseshoe crabs. A marine arthropod of the order Merostomata (swordtails) (Xiphosura), ****4 species, found on the east coasts of Asia and North America. Although also known as horseshoe crabs, they are not crabs, but are related to scorpions, spiders, and the extinct trilobite.

Classification status Amphipoda Arthrropoda Swordtail Xiphosura Horseshoe Crab Family Limulidae Horseshoe Crab Genus Tachypleus

Chinese horseshoe crabs are scoop-shaped, composed of the cephalothorax, abdomen, and caudal sword in three parts, the entire body is covered with a hard armor, the dorsal surface is rounded, and the ventral surface is concave, which belongs to the warm-water near the sea of the valuable and rare arthropods.

The horseshoe crab originated in the Devonian Period of the Paleozoic Era, long before the dinosaurs and primitive fish. It is called "living fossil" and has academic research value.