is the octopus an arthropod?
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Spiders are in the arthropod phylum. Octopuses are in the mollusk phylum of animals. The arthropods and the mollusks branched off from the same ancestor at least 700 MYA.
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Technically, they're not that closely linked, although crabs and spiders are both members of the arthropod family, as are other insects, and lobsters. Basically, they're classed together because they all have exoskeletons and jointed legs.
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They differ from other arthropods by the organization of their body into two main parts, the prosoma (equivalent to the head and thorax of insects ) and the opisthosoma (or the abdomen). There are six pairs of appendages associated with the prosoma.
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Octopuses can sometimes suffer from autophagy, or self-cannibalism. That is what is described as "eating its own arms." This is caused by stress. A stressed animal is not a healthy animal and is open to infection.
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Like other animals in the Mollusca phylum squid are invertebrates. Along with octopi and cuttlefish, squid are in the class Cephalopoda, but because of their three body sections they belong to their own order Teuthida, which at about 300 species is the largest group of Cephalopods.
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Both arthropods and vertebrates have articulated skeletons. ... Basically, the vertebrate skeleton is internal (an endoskeleton) while the arthropod skeleton is external (an exoskeleton). Here, both kinds will be referred to as skeletons.
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Crabs. Crabs belong to the subphylum Crustacean, the largest group of marine arthropods, which also includes lobster, shrimp, and krill, a shrimp-like crustacean. Crabs move sideways, walking on four pairs of legs, and holding their two legs with claws away from their body.
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Insects are in the kingdom Animalia. ... Insects are Arthropods (meaning jointed foot), in the phylum Arthropoda. This phylum also includes millipedes, scorpions, spiders and crabs.
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Arthropods is a phylum of animals that includes insects and spiders. They are invertebrates, which means they do not have an internal skeleton and backbone. Instead, they have a hard exoskeleton on the outside, the top layer of which is known as the cuticle.
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The members are known as molluscs or mollusks (/ˈmɒləsk/). ... Cephalopod molluscs, such as squid, cuttlefish, and octopuses, are among the most neurologically advanced of all invertebrates—and either the giant squid or the colossal squid is the largest known invertebrate species.
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Are Turtles Anthropods? Arthropods are invertebrate animals that have an exoskeleton, segmented body, and paired jointed appendages. Since turtles are vertebrates, they cannot be arthropods.
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Claire Little, a marine expert from the Weymouth Sea Life Centre in Dorset, said: "We've found that octopuses effectively have six arms and two legs. "Observations showed that they use the rearmost two to get around over rocks and the seabed.
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The ink of the octopus, or any cephalopod, is composed of highly concentrated melanin. ... It is a natural dye that cephalopods manufacture in an ink sac. Most, but not all octopuses have an ink sac and produce ink, but a few, such as the deep-sea octopuses, have lost this ability.
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That's because they are aggressive, some species are poisonous, and many of them are large in size. But there are some octopus species that are small, and can make good pets. They can be accommodated in a tank or aquarium, and aren't very difficult to handle or care for.
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Three defensive mechanisms are typical of octopuses: ink sacs, camouflage, and autotomising limbs. Most octopuses can eject a thick blackish ink in a large cloud to aid in escaping from predators. ... A few species, such as the Mimic Octopus, have a fourth defense mechanism.
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Like all other cephalopods, squid have a distinct head, bilateral symmetry, and a mantle. They are mainly soft-bodied, like octopuses, but have a small internal skeleton in the form of a rod-like gladius or pen, made of chitin.
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Octopuses are sea animals famous for their rounded bodies, bulging eyes, and eight long arms. They live in all the world's oceans but are especially abundant in warm, tropical waters.