Do you know the difference between octopus, octopus, cuttlefish, squid, squid and squid? How to remember differences and recognize these underwater creatures without being mistaken? We explain everything in this article.
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- Shellfish and cephalopods
- , also known as octopus: definition Cuttlefish
- : definition Squid
- and squid: definition
- Arm or tentacle?
Plan de l'article
Shellfish and cephalopods
Shellfish and cephalopods are fairly common invertebrate families and present in many oceans and seas of the world. Octopus and octopus are the best known, with their arms. Octopus and octopus arms are covered with hundreds of suction cups that allow them to hang and move on rocks.
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Octopus is also called octopus and vice versa, depending on their size and the region in which they are found. Cuttlefish, squid, squid and squid can therefore be classified as cephalopod molluscs. These are distinguished from octopus and octopus by their morphology .
Cephalopod molluscs, whether cuttlefish, squid, squid, octopus, octopus or squid, move by propulsion through water. Octopus and octopus are exceptionally intelligent and possess 250 million neurons , in a brain distributed in 9 places: head and 8 tentacles.
Let us detail together the characteristics of these cephalopods, the smartest invertebrates of their species.
Octopus, also known as octopus: definition
This mollusk appeared during the Cambrian era, 540 million years ago. We find the octopus in its natural habitat, in coastal waters, in rocky lens, near shoreline.
The octopus is called octopus in English, which means 8 arms in Latin. This cephalopod is characterized by its very recognizable morphology: a head (cephalo-) and 8 arms or feet (-pode) . The pelagic octopus is distinguished from the benthic octopus. The pelagic octopus lives near the surface of the water while the benthic octopus (benthic cephalopods) live more in the depths of the seas.
The octopus has 8 arms but has no tentacles. A mouth opening is located in the middle of these 8 arms. The octopus feeds and breathes in this way, by oxygenation. Octopus is an invertebrate that fixes oxygen differently than vertebrates, thanks to a protein that is not transported by red blood cells. The octopus has a blood of blue color , for that reason.
If the octopus or octopus feel attacked or endangered, they project a cloud of sepia ink to disturb the water and blur the tracks of its rapid escape into the waters. Sepia is used in cooking, but also in photography.
The octopus has the fascinating ability to change color according to its environment, such as chameleon. This allows him to conceal himself and escape predators, or, on the contrary, to hunt incognito without being spotted by its prey. Octopus or octopus are molluscs that can solve pragmatic problems, such as unscrewing the lid of a jar, in order to access food.
Cuttlefish is a cephalopod mollusk that lives near the bottom (benthic cephalopods). It is more particularly a decapode and not an octopod. As the squid, cuttlefish has a dorsal shell . To remind yourself of this specificity, you can associate the first letter of squid with the first letter of shell or shell.
Cuttlefish are extremely intelligent shellfish, just like octopuses. If you take a walk on the beach, it is likely that you will find cuttlefish bones , which can be carved, due to their chalky consistency.
Squid and squid: definition
Squid and squid are two variants of cephalopod molluscs. The squid has 8 arms and 2 tentacles , so it is a decapode, which has suction cups on all or part of its arms.
Some squid are of normal size, others of giant size . Giant squid is found off Japan, Canada, but also north of Europe. Large squid usually live in the depths, up to 2,000 m below the surface of the water.
Colossal squid can be 10-13 metres long and live in the Southern Ocean, north of Antarctica. Generally speaking, squid whose size is normal (less than 60 cm, also calledsquid or chipiron, especially in the Basque Country) is a squid, while the giant species are called squid. Squid or squid are consumed in their ink, cooked in tapas or frying, in pan-fried.
Arm or tentacle?
Arm and tentacle are distinguished in cephalopod molluscs. The tentacles of a cephalopod mollusk have some suction cups at the end. The armsare covered along their entire length and on one side with suction cups. There is often confusion between arms and tentacles. As you know now, octopus and octopus do have arms and not tentacles .
Now you know the difference between these animals and some of theirspecifics.