"Squid Squid are cephalopods in the order Teuthida with elongated bodies, large eyes, eight arms and two tentacles. 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. Squid can change colour for camouflage and signalling. Some species are bioluminescent, using their light for counter-illumination camouflage. Squid are members of the class Cephalopoda, subclass Coleoidea. The squid orders Myopsida and Oegopsida are in the superorder Decapodiformes (from the Greek for ""ten-legged""). Two"
"females are 12–18 cm in mantle length. The mantle of ""D. opalescens"" is not fused to the head and its body is 4 to 5 times longer than it is wide, with fins equal in both length and width. This squid has 8 arms with 2 longer tentacles ending in tentacular clubs equipped with suckers at their ends. The tentacular clubs are narrow with 4 rows of suckers and 2 large rows in the center of the tentacular club bordered by outer rows of smaller suckers. The 8 arms have only 2 rows of alternating suckers running down their length."
"the squid has a siphon, a muscle which takes in water from one side, and pushes it out the other side: jet propulsion. The squid has eight arms and two tentacles with suction cups along the backs. In between the arms sits the mouth, or beak. Inside the mouth is a tooth-tongue-like appendage called the radula. Squid have ink sacs, which they use as a defense mechanism against possible predators. Squid also have three hearts. The age of a squid can be determined on the basis of its growth rings, or statoliths, when additions are appended daily to the balance"
"Cephalopod limb All cephalopods possess flexible limbs extending from their heads and surrounding their beaks. These appendages, which function as muscular hydrostats, have been variously termed arms, legs or tentacles. In the scientific literature, a cephalopod ""arm"" is often treated as distinct from a ""tentacle"", though the terms are sometimes used interchangeably. Generally, arms have suckers along most of their length, as opposed to tentacles, which have suckers only near their ends. Barring a few exceptions, octopuses have eight arms and no tentacles, while squid and cuttlefish have eight arms (or two ""legs"" and six ""arms"") and two tentacles. The"
"a pair of tentacles. The third and fourth pairs of arms are longer than the others, and in males, the left fourth arm is heterodactylised near its tip. The tentacles are long and slender, each terminated by a club-shaped ""manus"" with small, narrow suckers at the edge and slightly larger ones at the centre. This squid occurs in the southeastern Pacific Ocean and the southwestern Atlantic Ocean. In the Pacific its range extends along the coast from southern Peru to southern Chile, and in the Atlantic, from the San Matías Gulf in Argentina southwards to Tierra del Fuego, including the"
"the fourth arm on the left modified into a hectocotylus. This is used to store spermatophores and transfer them into the mantle of the female during mating. The underside of the squid bears about 550 light-producing organs called photophores. These are arranged in transverse rows each consisting of 4 to 6 large ones with many small ones in between. There are two large and three medium-sized photophores below each of the large eyes. This species was first described from the Mediterranean Sea but is also found across much of the tropical and subtropical Atlantic Ocean. The range extends from France"
"or more have not been scientifically documented. The number of different giant squid species has been debated, but recent genetic research suggests that only one species exists. In 2004, Japanese researchers took the first images of a live giant squid in its natural habitat, and in July 2012, a live adult was first filmed in its natural habitat off Chichijima. Like all squid, a giant squid has a mantle (torso), eight arms, and two longer tentacles (the longest known tentacles of any cephalopod). The arms and tentacles account for much of the squid's great length, making it much lighter than"
"1984) with imprints showing it had 10 arms and a distantly related ""Treptoceas"" (""Orthonybyoceras"") from the Upper Ordovician near Cincinnati, Ohio were found with indications it, too, had 10 arms (Flower 1955). The 10 arms of squid (8 arms and 2 tentacles) are well known. Boletzkyida brings the origin of the [Neo?]Coleoidea near simultaneous with that of the Ammonoidea and may put their ancestry directly in the nautiloid Orthocerida. On another view... the group's taxonomic position is uncertain, with a possible affinity with the Dibranchiata [=Coleoidea], conceivably at a stem-group level, which would place its divergence as before the ammonoids"
"The modern convention however, is to speak of appendages as ""tentacles"" when they have relatively thin ""peduncles"" or ""stalks"" with ""clubs"" at their tips. In contrast the convention refers to the relatively shorter appendages as ""arms"". By this definition the eight appendages of octopuses, though quite long, count as arms. The tentacles of the giant squid and colossal squid have powerful suckers and pointed teeth at the ends. The teeth of the giant squid resemble bottle caps and function like tiny hole saws, while the tentacles of the colossal squid wield two long rows of swiveling, tri-pointed hooks. Cnidarians, such"
"attacked giant squid. Each tentacular club is divided into three regions—the carpus (""wrist""), manus (""hand"") and dactylus (""finger""). The carpus has a dense cluster of cups, in six or seven irregular, transverse rows. The manus is broader, closer to the end of the club, and has enlarged suckers in two medial rows. The dactylus is the tip. The bases of all the arms and tentacles are arranged in a circle surrounding the animal's single, parrot-like beak, as in other cephalopods. Giant squid have small fins at the rear of their mantles used for locomotion. Like other cephalopods, they are propelled"
"its arms. The suckers are absent from its manus and the squid's dactylus is reduced. Photophores occur throughout its body. Large photophores are present on its head, funnel, base of arms, and tentacular stalk. Other photophores are present on the ventral surface of its mantle (usually 22), with numerous very small photophores on its head, funnel, base of arms II and tentacular stalk. Mature males have large photophores on tips of arms IV opposite the mouth. Mature females have photophores on tips of their dorsal six arms. The number of large photopores on the squid's mantle increases as it matures."
"the tentacles remain, but pieces of them were found strewn for some distance on the beach, showing that the animal had a fierce battle with its foes before it was disabled and beached by the surf. Grant describes the animal as having seven ""tentacles"" and a ""tail"". If the ""tail"" is interpreted as another tentacle, giving a total of eight, this would suggest an octopus as opposed to a decapod, such as the squid or cuttlefish. Furthermore, nothing in the description indicates the presence of the long feeding tentacles found in squid, as the ""tentacles"" are said to be of"
"purple pigmentation with purple chromatophores overlaid with greyish tubercles, or having thickly crowded deep brownish chromatophores. In life, these animals appear dark red or purple Like all squids, it has eight arms. Like other species in this family, it also has two long, whip-like tentacles. The tentacles of this species are unique in this family in that they contain some large suckers, while other mastigoteuthids have small to microscopic suckers. The largest tentacle suckers of ""I. cordiformis"" are nearly the same size as the arm suckers, but the size diminishes towards the very ends of the tentacles and the suckers"
"Japanese flying squid. It also has relatively small fins which only have a length equivalent to 25 to 31% of the mantle length (35-40% in the Japanese flying squid). It has a cylindrical, muscular body, typical of related species, which tapers to a short, pointed tail. Its fourth right arm bears a hectocotylus on the distal half and has 11-13 normal suckers on its basal portion, ventral trabeculae which are broadened and joined forming low serrated fan with approximately 20 pairs of trabeculae. The second and third arms on each side are longer than the first and fourth arms being"
"having distinct spectral sensitivities. The firefly squid measures about long at maturity and dies after one year of life. It has the standard eight arms and two tentacles, with one pair each having three, bright light-emitting organs at the tips. The squid spends the day at depths of several hundred metres, returning to the surface when night falls. It uses its abilities to sense and to produce light for counter-illumination camouflage: it matches the brightness and colour of its underside to the light coming from the surface, making it difficult for predators to detect it from below. The firefly squid"
"Cephalopod attack Various accounts of cephalopod attacks on humans have been reported since the 13th century. Cephalopods are members of the class Cephalopoda, which include all squid, octopuses, cuttlefish, and nautiluses. Some members of the group are capable of causing injury or even death to humans. Tentacles are the major organs used by squid for defending and hunting. They are often confused with arms—octopuses have eight arms, while squid and cuttlefish have eight arms and two tentacles. These tentacles are generally longer than arms and typically have suckers only on their ends instead of along the entire length. The giant"
"If a predator were to bite off an arm tip, the vampire squid can regenerate it. They have eight arms but lack feeding tentacles, and instead use two retractile filaments in order to capture food. They combine the waste with mucus secreted from suckers to form balls of food. They feed on detritus, including the remains of gelatinous zooplankton (such as salps, larvaceans, and medusae jellies) and complete copepods, ostracods, amphipods, and isopods. Vampire squids have been found among the stomach contents of large, deepwater fish, including giant grenadiers, and deep-diving mammals, such as whales and sea lions. The Vampyromorphida"
"25 simple or pinnate oral tentacles. Aspidochirotida are the most common sea cucumbers encountered, with a strong body and 10–30 leaf like or shield like oral tentacles. Dendrochirotida are filter-feeders, with plump bodies and 8–30 branched oral tentacles (which can be extremely long and complex). Sea cucumbers are typically in length, although the smallest known species are just long, and the largest can reach . The body ranges from almost spherical to worm-like, and lacks the arms found in many other echinoderms, such as starfish. The anterior end of the animal, containing the mouth, corresponds to the oral pole of"
"Bobtail squid Bobtail squid (order Sepiolida) are a group of cephalopods closely related to cuttlefish. Bobtail squid tend to have a rounder mantle than cuttlefish and have no cuttlebone. They have eight suckered arms and two tentacles and are generally quite small (typical male mantle length being between 1 and 8 cm). Sepiolids live in shallow coastal waters of the Pacific Ocean and some parts of the Indian Ocean and Atlantic Ocean as well as in shallow waters on the west coast of the Cape Peninsula off South Africa. Like cuttlefish, they can swim by either using the fins on"
"ridge. The squid are a reddish orange colour with a large complement of chromatophores. The suckers of the arms possess blunt teeth. On the meaty ends (""clubs"") of the tentacles, there are four rows of suckers; the inner two (""mesial"") rows are three times as large as the outer two (""marginal"") rows. The larger suckers have horny rings with up to 45 teeth. These squid reach a maximum mantle length of 33 centimetres in males and 22 centimetres in females. Sexual dimorphism is apparent, with the left ventral arm in males modified into a hectocotylus; this is used to facilitate"
"rest of the family (and from most squid) by their lack of tentacles as adults. Only one species, the fiery armhook squid (""Gonatus pyros""), possesses photophores; these are located on the ventral periphery of the eyes. Gonatids typically have muscular, cylindrical bodies with very soft, reddish to purplish-brown skin. The arms are thick and capable; the fins vary in shape and size, from sagittate and about 50% of the mantle length, to reniform and about 30% of the mantle length. Of moderate size, these squid range in size from 11 to 40 cm—most species are 25 cm or less. Females"
"incorporated 10 anterior appendages that are approximately the size of its body. Two of these tentacles are used for food collection while the other 8 of them are part of its respiratory and sensory system. Moreover, it possesses two feather-like structures on its head, called nuchal organs which analyze chemical signals in the sea. Their organs are organized in a horseshoe-shaped appearance from the head to the back. Its mouth is located in the anterior front part of its body and it has no barrier protecting its pharynx. The squidworm has four pairs of branchiae (gills) positioned in two rows"
"a man-eating squid species ""Haploteuthis ferox"". Prototype chromatophores that mimic the squid's adaptive camouflage, have been made by Bristol University researchers using an electroactive dielectric elastomer, a flexible ""smart"" material that changes its colour and texture in response to electrical signals. The researchers state that their goal is to create an artificial skin that provides rapid active camouflage. Squid Squid are cephalopods in the order Teuthida with elongated bodies, large eyes, eight arms and two tentacles. 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"
"tentacles. Olivier de Kersauson (captain of the yacht) then stopped the boat, causing the squid to lose interest. ""We didn't have anything to scare off this beast, so I don't know what we would have done if it hadn't let go,"" Kersauson said. Cephalopod attack Various accounts of cephalopod attacks on humans have been reported since the 13th century. Cephalopods are members of the class Cephalopoda, which include all squid, octopuses, cuttlefish, and nautiluses. Some members of the group are capable of causing injury or even death to humans. Tentacles are the major organs used by squid for defending and"
"fished commercially, predominantly in Mexico and Peru. Some squid may grow to in mantle length and weigh up to . Generally, the mantle (or body) constitutes about 40% of the animal's mass, the fins (or wings) about 12%, the arms and tentacles about 14%, the outer skin about 3%, the head (including eyes and beak) about 5%, with the balance (26%) made up of the inner organs. Humboldt squid are carnivorous marine invertebrates that move in shoals of up to 1,200 individuals. They swim at speeds up to propelled by water ejected through a hyponome (siphon) and by two triangular"
"length in some species. It is from these 'whip-like' tentacles that their common name derives. Unlike most other squid, the club of the mastigoteuthid tentacle is not significantly (usually not at all) broader than the rest of the tentacle and is covered in very small suckers—in some species, invisible to the naked eye—which impart an extremely sticky property to the clubs, themselves answering for 70% or more of the tentacle's length in some species. Many species also possess photophores (bioluminescent organs) which may be located on either the skin, the surface of the eyeball, or the eyelid. These photophores have"
"on this squid with four immature males that were relatively different in size. They are found in tropical waters but little about what they consume is known. They are equipped with small sharp beaks so it is thought they prey on small fish and marine organisms. Their arms vary in length and arms II and III are greatly elongated and have filamentous suckerless tips. However arms III are longer and more robust than arms II. There does not seem to be an abundance of these squids; they are scarcely seen or consumed by humans. During the day they take refuge"
"the coleoid cephalopods is currently controversial, thus their position is subject to future change. Bobtail squid Bobtail squid (order Sepiolida) are a group of cephalopods closely related to cuttlefish. Bobtail squid tend to have a rounder mantle than cuttlefish and have no cuttlebone. They have eight suckered arms and two tentacles and are generally quite small (typical male mantle length being between 1 and 8 cm). Sepiolids live in shallow coastal waters of the Pacific Ocean and some parts of the Indian Ocean and Atlantic Ocean as well as in shallow waters on the west coast of the Cape Peninsula"
"of tentacles on the head: when extended the upper pair have eyes at their tips; the lower pair are chemoreceptors. Both pairs are fully retractable muscular hydrostats, but they are not used for manipulation or prey capture. Some marine snails such as abalone and top snails, Trochidae, have numerous small tentacles around the edge of the mantle. These are known as ""pallial tentacles"". Among cephalopods, squid have spectacular tentacles. They take the form of highly mobile muscular hydrostats with various appendages such as suction disks and sometimes thorny hooks. Up to the early twentieth century ""tentacles"" were interchangeably called ""arms""."
"by greatly stretching the two tentacles like elastic bands. Based on the examination of 130 specimens and of beaks found inside sperm whales, giant squids' mantles are not known to exceed . Including the head and arms, but excluding the tentacles, the length very rarely exceeds . Maximum total length, when measured relaxed ""post mortem"", is estimated at for females and for males from the posterior fins to the tip of the two long tentacles. Giant squid exhibit sexual dimorphism. Maximum weight is estimated at for females and for males. Little is known about the reproductive cycle of giant squid."
"set of tentacles and highly developed sense organs, including advanced eyes similar to those of vertebrates. The ancestral shell has been lost, with only an internal gladius, or pen, remaining. The pen, made of a chitin-like material, is a feather-shaped internal structure that supports the squid's mantle and serves as a site for muscle attachment. The cuttlebone or sepion of the Sepiidae is calcareous and appears to have evolved afresh in the Tertiary. The head and foot of the squid are at one end of a long body, and this end is functionally anterior, leading the animal as it moves"
"fins. Their tentacles bear 100–200 suckers, each lined with razor-sharp teeth, with which they grasp prey and drag it towards a large, sharp beak. Although Humboldt squid have a reputation of being aggressive towards humans, some disagreement exists on this subject. Research suggests these squid are only aggressive while feeding; at other times, they are quite passive. Their behavior while feeding often extends to cannibalism and they have been seen to readily attack injured or vulnerable squid of their own shoal. A quarter of squid stomachs analyzed contained remains of other squid. This behavior may account for a large proportion"
"Octopus The octopus is a soft-bodied, eight-limbed mollusc of the order Octopoda. Around 300 species are recognised, and the order is grouped within the class Cephalopoda with squids, cuttlefish, and nautiloids. Like other cephalopods, the octopus is bilaterally symmetric with two eyes and a beak, with its mouth at the center point of the eight limbs (traditionally called ""arms"", sometimes mistakenly called ""tentacles""). The soft body can rapidly alter its shape, enabling octopuses to squeeze through small gaps. They trail their eight appendages behind them as they swim. The siphon is used both for respiration and for locomotion, by expelling"