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A cephalopod / ˈ s ɛ f ə l ə p ɒ d / is any member of the molluscan class Cephalopoda / s ɛ f ə ˈ l ɒ p ə d ə / (Greek plural κεφαλόποδες, kephalópodes; "head-feet") such as a squid, octopus, cuttlefish, or nautilus.These exclusively marine animals are characterized by bilateral body symmetry, a prominent head, and a set of arms or tentacles (muscular hydrostats) modified from the primitive molluscan foot.Fishers sometimes call cephalopods "inkfish", referring to their ...
Jul 5, 2024 · cephalopod, any member of the class Cephalopoda of the phylum Mollusca, a small group of highly advanced and organized, exclusively marine animals.The octopus, squid, cuttlefish, and chambered nautilus are familiar representatives. The extinct forms outnumber the living, the class having attained great diversity in late Paleozoic and Mesozoic times. The extinct cephalopods are the ammonites, belemnites, and nautiloids, except for five living species of Nautilus.. General features and ...
Cephalopod literally means “head foot” in Greek, a reference to the way the cephalopod’s head connects to its many arms. The basic cephalopod body plan includes two eyes, a mantle, a funnel (also called a siphon), and at least eight arms. Some have hard, internal structures, like the cuttlebone in the cuttlefish and the pen in the squid, that evolved from the hard, outer shells of their ancestors, but in many octopuses the hard structure is completely lost. ...
cephalopod , Any marine mollusk of the class Cephalopoda (e.g., cuttlefish, nautilus, octopus, and squid), which includes the most active and largest living invertebrates. Cephalopods are bilaterally symmetrical and typically have a highly developed centralized nervous system. Their image-forming eyes are similar in structure to vertebrate eyes, and their heads are armed with tentacles that have rows of round suction disks. Most cephalopods can change skin colour to blend in with their ...
Oct 13, 2021 · The word cephalopod means "head foot" in Greek, referring to the fact that these two body parts are merged in these animals, according to the New World Encyclopedia.There is a wide variety of body ...
Dec 13, 2019 · Nautiluses have a coiled shell, are slow-moving, and are only found in deep water; they have more than 90 arms.; Squids are by and large torpedo-shaped, fast-moving, and have a thin, flexible internal shell called a pen. The pupils of their eyes are circular. Cuttlefish look and behave like squid but they have stouter bodies and a broad internal shell called a "cuttlebone." They navigate by undulating their body fins and live in the water column or on the sea floor.
The Cephalopoda (Greek meaning "head-foot") is an important mollusc class.They have bilateral symmetry, a head, and arms or tentacles. Teuthology, a branch of malacology, is the study of cephalopods.. The class has two living subclasses.In the Coleoidea, the mollusc shell has become smaller, or is not there at all; this subclass has the octopus, squid, and cuttlefish.The Nautiloidea have a shell; Nautilus is its only living genus.. There are at least 800 different living species of ...
Cephalopods are an exclusively marine group comprising octopuses, cuttlefish, squids and nautiluses says Stuart Blackman
Jul 5, 2024 · Cephalopod - Tentacles, Jet Propulsion, Camouflage: Cephalopods vary from elongate, streamlined oceanic organisms to saccular, slow-moving bottom and drifting forms. In general, the viscera are covered by the mantle, and the central nervous system is highly developed. The sense organs are eyes, rhinophores, statocysts, and tactile organs. The first cephalopods probably had a simple, caplike shell.
The name cephalopod ("head-foot") refers to the large, well-developed head and the prominent foot of tentacles. Octopuses have eight arms, squids and the squid-like cuttlefish have eight arms and two tentacles, and nautiluses have up to 90 tentacles. These typically have suckers or hooks, with the exception of Nautilus. Teuthology is the study of cephalopods. Anatomy.
