Cephalopod

Cephalopoda (scientific name: Cephalopoda): There are about 700 species in existence. Including nautilus, squid, soft fish, octopus, etc. The body is symmetrical. The head is well developed with well-developed eyes on both sides. Part of the foot becomes a mollusc around the mouth of the head. The mantle is muscular and heals on the left and right to form a sac-shaped coat cavity. The internal organs are contained in it. The skin on both sides or back of the coat extends into fins, which can swim with the waves of the fins. Shells are generally encased in the mantle and degenerate to form a horny or calcareous inner bone, called a salamander, which can be used as medicine. The nervous system is relatively concentrated. The brain ganglion, foot ganglion and visceral ganglion are synthesized well, surrounded by cartilage. The heart is very developed. Dioecious.

All marine organisms have many types of fossils, which flourished in the Mesozoic era. They are divided into Nautiloiea and Coleoidea based on the number of gills and wrists. Most of them are edible. Nautilus, squid, octopus, etc. can be eaten fresh or dried.