Amazon Doesn't Want You to Know About This Plugin. The Mollusca class as a whole is known to contain at least 55,400 individual species, but the cephalopod is a minority in this group, with squid species only numbering 650 and total cephalopod species totaling 800. Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free! Nautilus, plural nautiluses, or nautili, either of two genera of cephalopod mollusks: the pearly, or chambered, nautilus (Nautilus), to which the name properly applies; and the paper nautilus (Argonauta), a cosmopolitan genus related to the octopus. Cephalopod literally means “head foot” in Greek, a reference to the way the cephalopod’s head connects to its many arms. The octopus, squid, cuttlefish, and chambered nautilus are familiar representatives. They are a phylum within that class that involves animals with distinctive features such as noticeable heads, some sort of arms or tentacles for grasping and eating, and bodies that can be divided down the middle and show symmetry on both sides. Learn about a little known plugin that tells you if you're getting the best price on Amazon. They are known to exist in every ocean regardless of whether it is warm and tropical or a freezing polar region. All are venomous but only the blue-ringed octopus is deadly to humans. Unlike its color-changing cousins, though, the soft-bodied nautilus lives inside its hard external Hello 2021. Blue-ringed octopus Squid A cephalopod is part of the family of animals called mollusks, which includes everything from snails to scallops. Most have a very short life span and only live a few weeks to months after reproduction. cephalopodとは。意味や和訳。[名]《動物》頭足類（ イカ・タコなど） [形]《動物》頭足類の - 80万項目以上収録、例文・コロケーションが豊富な無料英和和英辞典。 They are often labeled as inkfish by local fishermen who reside in coastal regions that they inhabit, as they have the ability to expel a cloud of inky material as a distraction and cover to escape predators. Imagine if you could hear three heartbeats at once? Learn more. The strong beak is at the entrance to the buccal cavity , on the floor of which lies the radula. The class Cephalopoda means "head foot", meaning their arms and tentacles come from the head. EnchantedLearning.com is a user-supported site. These are ancient species that are found in all of the world's oceans, and are thought to have originated about 500 million years ago. Squid, octopuses, cuttlefish, the chambered nautilus, and their relatives display remarkable diversity in size and lifestyle with adaptations for predation, locomotion, disguise, and communication. Cephalopods have the most highly developed nervous system of all invertebrates. Press your ear against someone's chest. However one species, the Atlantic brief squid, can tolerate brackish water. They are a phylum within that class that involves animals with distinctive features such as noticeable heads, some sort of arms or tentacles for grasping and eating, and bodies that can be divided down the middle and show symmetry on both sides. Test your knowledge - and maybe learn something along the way. cephalopod any member of the class Cephalopoda containing molluscs such as squids (10 arms) and octopuses (8 arms). 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