They are called cephalopods to the class of invertebrate animals , that is, those that lack a backbone and articulated internal skeleton, which are known to have an organ called foot and that is located next to their head with tentacles of windy type. This class is very curious as it has various cells whose function is to help them change color in order to camouflage themselves, and these cells are called chromatophores.
The most outstanding features are the following:
- They subsist on a diet of meat.
- They have 2 salivary glands and one of them can be poisonous.
- They move from one place to another by means of a jet propulsion mechanism.
- The most important sense is that of sight to be able to hunt their prey in this way.
The octopus is known to be a marine animal of the cephalopod mollusk family that has no internal or external skeleton. It is said to be the most intelligent of invertebrates and feeds on fish, small crustaceans and even algae as it lives in tropical waters and temperate oceans.
Behind its strange appearance we can mention that it has 3 hearts and 8 tentacles, in which it has powerful suction cups.
The giant squid is considered the largest mollusk in the world, reaching 240 cm and weighing 275 kg, belonging to the genus Architeuthis of the Teuthida order .
It has 8 arms, but only the 2 longest tentacles are used to catch prey when they reach 12 meters in length. In turn, each arm has suction cups, which have rings with teeth to suck and stick them into the victim for greater safety.
The nautilus is a genus of cephalopod molluscs of which only 3 species currently exist . It is characterized by having a brown or reddish shell, although there are exceptions as there are some white. It is normally found in the Indian Ocean and the Pacific Ocean, especially in coral reefs.
The cuttlefish, also known as cuttlefish or cuttlefish, is an animal that belongs to the order of Sepiida . It has a tiny shell that is hidden by being covered by the lateral folds of the mantle, and with tentacles distributed in 4 pairs around the mouth.
Its ink, instead of being black like that of the squid, is sepia, which is why it is called that. In addition, this cephalopod adapts very well to swimming in different waters, so it practices continuously in a horizontal position.
The vampire squid has a reddish or brownish color that blends perfectly with its red eyes.
It differs from the others by having a cape, which is really a thin and flexible skin that is linked with the arms. It lives in tropical and subtropical areas and has the ability to reach depths of 900 meters to hide from the sun.