Cephalopods are the most developed class of molluscs (Mollusca).
Cephalopod molluscs, such as squid, cuttlefishand octopus, are among the most neurologically advanced of all invertebrates—and either the giant squid or the colossal squid is the largest known invertebrate species ever.
Their body is two-sided symmetrically and clearly divided into the head and body. At the front of the head is the mouth, around which there are 8 (Octopoda), 10 (Decapoda) or an indefinite number of attachment arms. two extended arms.
The skin contains pigment cells or chromatofors, in which the pigment grains are black, red, yellow or gray. By spreading and smoothing chromatofors, the cranks can change color quickly. The change is adjusted to the color of the bottom, depending on the excitement in the central nervous system and related to the visual impressions of the animal. The vivid headache system reaches the high complexity of the material and is above the other molluscs (snails, bivalves, etc.) and all other invertebrates.
Cephalopods are the most intelligent, most mobile, and the largest of all molluscs. Squid, octopuses, cuttlefish, the chambered nautilus, and their relatives display remarkable diversity in size and lifestyle with adaptations for predation, locomotion, disguise, and communication. These "brainy" invertebrates have evolved suckered tentacles, camera-like eyes, color-changing skin, and complex learning behavior. Their lengthy evolutionary history spans an impressive 500 million years and the abundant fossils they've left behind (mostly shelled nautiloids and ammonoids) record repeated speciation and extinction events. From myths about their enigmatic fossilized remains to fantastic accounts of tentacled sea monsters, cephalopods also figure prominently in the literature and folklore of human societies around the world.
Cephalopods are the favorite food and hunt for many. As well as their meat, especially cuttlefish and squid, contain a variety of macro and micro nutrients, vitamins. So 100 grams of cuttlefish black ink contains 16.78 grams of protein, 0.79 fat, 0.93 grams of carbohydrates and has an energy value of 79 kcal. In the black ink are also proteins, lipids, minerals, especially iron, that is why the largest request of black ink in gastronomy, especially in Japan and the Mediterranean. First of all, as a natural color of food and seasoning that gives the dish an unbelievable black color and a unique flavor of the sea. It is used to prepare risoto, paella, spaghetti, sauce, black bread, even ice cream!