Squids and octopuses are types of sea creatures known as cephalopods.They can be found inhabiting the deep water and open ocean ranging from the tropics to temperate zones. Though similar in nature, there are a few ways we can tell these two creatures apart.Both varieties of sea creatures have eight arms (which they are known for), however, squids have two long tentacles as well. They have different body shapes too, which can help to tell them apart at a glance. To learn more about octopus vs squid, octopus vs squid fight and octopus vs squid intelligence, keep reading!If you enjoyed this article, feel free to check out our other pages on difference between donkey and mule and difference between leopard and jaguar.What is the difference in size between an octopus and squid?Though it is widely believed that out of the two squids are smaller in size, it is actually the opposite! Different species of octopus range in length between 0.03-29.5 ft (0.1-9 m), however squids can grow much larger, with an average range being between 2-65.6 ft (0.6-20 m). There are 298 known species of squids, with the count for octopuses being around 300. The largest squid species is the giant squid, with the smallest being the pygmy squid. The largest octopus is the Pacific octopus, and smallest is the Octopus wolfi.Among octopuses, there are a few varieties to stay wary of. The deadly blue ringed octopus is one such example, which can be found near Australia and is far more deadly than any species of squid. Some squid species have a toxic bite, however squid are at their most terrifying when in groups. These social animals can live in groups of up to 1200 members, which can be very aggressive!Squid meat is also very popular among seafood lovers, with a dish made by frying battered squid rings, called Calamari, being known to be very tasty. Octopus is more popular in Japan, Korea, and the Mediterranean where is it considered a delicacy.How do they both reproduce?Both octopuses and squids reproduce sexually, though they can only mate with members of their own species. Squids and octopuses cannot mate with each other.Octopuses of both male and female varieties exist, and they mate over a week. They are not monogamous, with different males copulating with different females over a period of time. After male octopuses use a specialized arm for transferring their sperm to the mantle cavity of a female, fertilization will occur over time. When a female octopus is ready to lay eggs, it will seek an isolated place such as a crevice, hole or corner of a reef. The female lays around 100,000-500,000 and protects its territory with shells, garbage, and rocks. The eggs are sticky and will attach themselves to the sandy substrate with strings. They are taken care of by their mother until they hatch, after which the mother will die.Squids mate in almost the same way, with the male depositing its sperm into the females mantle cavity, which then fertilizes the eggs stored in its body, in the ovary. The incubation time for squid is lower than that of octopuses, around four to eight weeks.The lifespan of squids lasts for around nine months to five years, whereas octopuses have a lifespan of between one to three years. Growing juveniles feed on plankton, with the prey of fully grown individuals consisting of mainly fish and shrimp.How do they camouflage?Octopuses and squids are a part of the class cephalopoda and are excellent at camouflaging themselves.They both camouflage in the same way, by controlling the size of papillae (raised bumps) on their skin, creating textures ranging from small bumps to tall spikes and rings. They can change their color and pattern as well, helping them to hide themselves along the ocean floor, in order to escape predators and catch prey. They also use swimming as a defence mechanism.What is the difference in their body structure?Octopuses and squids are both cephalopods, meaning ‘head footed’. They have been classified this due to their lack of proper legs, with their large heads being their main feature. They are both also invertebrates as they do not possess any bones or a spinal cord. They are included in the group of mollusks as well, though they do not possess a hard outer covering or shell like other mollusks do.Octopuses are known for being almost liquid like in nature. They can squeeze through the tightest spots by compressing their bodies, as they do not possess even a single bone and lack a shell. In comparison, squids have a flexible backbone-like structure in their bodies, like an inner shell. This is called a pen or cuttlebone. Both of them have a hole called a mantle cavity in the center, where their legs join. This contains their gills, anus, and reproductive organs.When it comes to limbs, squids actually have more limbs out of the two! Both creatures have eight arms each. Arms are limbs that have rows of suckers along their full length. However, squids have an extra two limbs known as tentacles, limbs that only have suckers at the end. The eight arms and two tentacles make for a total of 10 limbs.Octopuses usually only have one or two rows of suckers lined across their arms, which they use to latch onto surfaces in order to move their bodies, catch prey, and stabilize themselves while moving along the ocean floor and swimming. Squids however have extra hooks and rings as well as suckers. These are used to get a better grip on their prey than suckers.Squids have a longer, cylindrical body. Their triangular head has two fins on the side, with two long tentacles that are longer than their arms. However, an octopus has a round head, from which its arms fan out, and no tentacles.Squids can use their fins to propel themselves, however, both squids and octopuses are also known to travel by the means of jet propulsion. They suck water into their mantle cavities and release it through a narrow siphon. They can use this to move in any direction quite easily, without the use of their arms.Here at Kidadl, we have carefully created lots of interesting family-friendly facts for everyone to enjoy! If you liked our suggestions for difference between octopus and squid then why not take a look at difference between ox and bull, or dumbo octopus facts.
Squids and octopuses are types of sea creatures known as cephalopods.
