Photo credits: Octopus – NURC/UNCW and NOAA/FGBNMS. Octopus – NOAA OKEANOS explorer Program 2013 Northeast U. S. Canyons Expedition.

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You wouldn’t be alone if you believed the octopus and squid to be the very same animals. They room cousins—both part of the team cephalopoda—a group of marine mollusks that incorporate squid, octopus, nautilus, and also snails. The largest cephalopod is the large squid and the smallest being the pygmy squid. These animals are all identified by symmetry bodies, no vertebrae, influential heads, and arms or tentacles that expand from your bodies. Unequal nautilus and snails, the octopus and squid advanced to have bodies the don’t call for use that a tough shell for protection, which is because of other adaptations the they occurred like the ability to camouflage, heightened intelligence, and strong, functional arms.

There are nearly 300 varieties of squids and 300 species of octopus in the global ocean. So, what room the differences in between the two?

Where castle live: Squids typically live in the open ocean while octopuses contact the seafloor home, generally in dark crevices; both live in saltwater from the tropics to an ext temperate zones.

What castle eat: Octopuses usually eat crustaceans indigenous the ocean floor while squids normally feed on shrimp and little fish in the water column.

How castle eat: Octopuses grab your prey with their arms, pierce v their shells or skin to inject paralyzing venom, and crushes the body in their mouth. Squids usage their two lengthy tentacles to catch prey and eat it in chunks.

How they look: Octopuses have a mantle, rounded head, rectangle-shaped pupils top top their two eyes, eight arms, and come in a wide variety of colors if squids have two fins at the optimal of your mantle, a triangular head, circular pupils on your eyes, a strictly backbone-like structure referred to as a pen, and also a combination of arms and also tentacles, which have hooks and also suckers.

Their appendages: Octopuses have actually eight arms spanned in suckers while squids have actually eight arms and also two much longer tentacles supplied to catch fish and also shrimp in open-ocean waters. Octopus eight are much more flexible 보다 those that a squid, permitting them come walk, handle objects, and also manipulate their environment.

Defenses: Some types of squids can expel clouds that ink into the water because that a fast escape once they feel intimidated while one octopus can adjust colors come hide or squeeze your bodies into the tiniest that crevices or objects choose shells.

Reproduction: masculine octopuses usage a specialized arm (the hectocotylus) to transport sperm come a female, who then lays teams of egg in strings that could resemble decorate strings of vacation lights in she den. Females will certainly guard the eggs till they hatch, which can be all over from 30 days to one year later depending on the species. Squids at the same time mate in huge groups, attaching your eggs to solved structures prefer rocks or coral. Ink parents don’t invest in your young, they simply let them flower and try to make it in the world.

Lifespan: Octopuses room generally much shorter lived through a expectancy of one to 3 years, while squids deserve to live ripe months to 5 years. Masculine octopuses and also squids usually die quickly after mating.

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Social structures: Octopuses room solitary animals (except for mating periods) when squids can live separately or in schools.