The smallest species of squid, the sepiolid, is under 2.5 cm (1 inch) long. The majority of squid are no more than 60 cm (2 feet) long, although the giant squid may reach 13 m (43 feet) in length. Additionally, a squid has two head fins, while the octopus has no fins at all - except for some deep-water species like the Dumbo octopus. The squid has a triangular head, eight arms in the rear and two extra long tentacles, which are equipped with hooks and suckers or sucker rings. An octopus has a round head, a bilaterally symmetric body, a mantle and eight long arms with one or two rows of suckers that help it taste its food.Ī squid has a soft body like that of an octopus, but a robust and pliable structure, known as a pen, which acts like a flexible backbone that runs the length of the animal’s body and stabilizes it whilst it’s swimming. The only hard part on an octopus’ body is its beak, which is made of chitin. AnatomyĪn octopus is a soft-bodied creature, as it does not possess a skeleton. So what exactly separates octopuses and squid? Let’s find out. However, if you dig deeper into their anatomy and how they function, you’ll see that they differ in their physical characteristics, habitat, and behavior. Both these creatures live in salt water, their blood is blue due to the presence of copper in it, they have three hearts each, and, quite frankly, look a lot alike. O ctopuses and Squid are both head-footed aquatic animals that fall under the molluscan class Cephalopoda.
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