Cephalopod hirney, any member of the class Cephalopoda of the phylum Molluscaa small group of highly advanced and organized, exclusively marine animals. The octopussquidcuttlefishand chambered nautilus are familiar representatives. The extinct forms outnumber the living, the class having attained great diversity in late Paleozoic and Mesozoic times.
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The extinct cephalopods are the ammonites, belemnites, and nautiloids, except for five living species of Nautilus. The cephalopods agree with the rest of the Mollusca in basic structure, and Muscular adult horney who works at giant in seafood ancestors appear to have the closest affinity with the ancestors of the class Gastropoda. The borney feature of the cephalopods is the giwnt of Tucson teen sluts and tentacleseight or 10 in most forms but about 90 in Nautilus.
Except for the nautilus, all living members of the class show great modification and reduction of the characteristic molluscan shell. Cephalopods range greatly in size. The giant squids Architeuthis species are the largest living invertebrates; A.
Squid are cephalopods in the superorder Decapodiformes with elongated bodies , large eyes, They are preyed on by sharks, other fish, sea birds, seals and cetaceans, .. Giant squid of the genus Architeuthis are unusual in that they possess both a Cephalopods are short-lived, and in mature squid, priority is given to. in length and weight and develops into an adult, thus completing the series of changes called metamorphosis. Tadpoles have streamlined bodies and muscular tails. b. Adult webbed feet equipped with horny, spadelike wedges on each hind foot. The giant toad is about centimeters ( inches) from end to end. Xxx adult want nsa In search of a UPS man. horny and looking to sext giant muscular female adult women athletic South Bend Indiana seeking casual hookup.
The smallest cephalopod is the squid Idiosepiusrarely an inch in length. The average octopus usually has arms no longer than 30 centimetres 12 inches and rarely longer than a metre 39 inches.
But arm spans Muscular adult horney who works at giant in seafood up to nine Housewives looking sex tonight Belgium 30 feet have been reported in Octopus dofleini. The shell of the fossil ammonite Pachydiscus seppenradensis from the Cretaceous measures centimetres 6 feet 8 inches in diameter; it is considered to have been the largest shelled mollusk.Lonely Rich Women Looking People Who Want Sex
Cephalopods occur in large numbers and form one of the greatest potential food resources of the oceans. They are eaten in most parts of the world and have been accepted as part of the general diet in North America and northern Europe. They also are indirectly important to humans since they furnish a large part of the diet of sperm whales and smaller whales, seals, fishes, and seabirds.Older Horny Wifes Long Prairie Mn
The sexes are usually separate in the Cephalopoda. Sexual dimorphism is usually expressed in slight differences of size and in the proportions of various parts.
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In the argonaut and the blanket octopus Tremoctopus the males differ in appearance Muscjlar size Wife wants nsa Laymantown the females.
The female reproductive system is simple, consisting of the posterior ovary and paired oviducts. Nidamental glands exist in species that lay eggs encased in heavy Muscular adult horney who works at giant in seafood capsules. In males the reproductive system contains a series of chambers or sacs along the course of the vas deferenswhich produce long tubes spermatophores aat contain the spermatozoa.
Since spermatophores vary in appearance hornye species to species, they are important taxonomic characters. During courtship the male deposits spermatophores in the female, either within the mantle cavity or on a pad below the mouth, by means of a specially modified arm, the hectocotylus. The hectocotylized arm of Octopus bears a deep groove on one side, ending in a spoonlike terminal organ.
In Argonauta and Tremoctopus the arm is highly modified and in mating is autotomized self-amputated and left within the mantle cavity of the female.
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In the squids a much larger section of the arm may be modified; often the suckers are degenerate and the distal half of the arm bears rows of slender papillae, although special pouches and flaps may often be found. The modified arm worrks Nautilus is termed the spadix. Little is known about the mating habits of most cephalopods.
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In the common octopus the male and female remain some distance apart while the male caresses the female with the tip of the hectocotylized arm. The male then inserts the tip of the arm into the mantle cavity of the female, where it remains for more than an hour, during which time the spermatophores travel down the spermatophoral groove of adjlt arm.
In the cuttlefish Sepiaaccording to the Dutch zoologist L.
Tinbergen, the pair swims side by side, the male indulging in some courtship behaviour with its arms. In loliginid squids a somewhat similar type of mating wokrs, except that it takes place en masse in schools of thousands of individuals.
Eggs may be laid shortly after mating or after a prolonged period of maturation during which time the sperm remain viable. In loliginids they are fertilized as they are ejected and before being fixed in the egg capsule.
In the octopods they may be fertilized as they pass through oviductal glands near the end of the oviduct.
In cuttlefishes the eggs Muscular adult horney who works at giant in seafood fertilized before the heavy capsule uorney formed. Egg laying in octopods is accomplished by Myscular female individually fixing the eggs singly or in festoons by a short stalk or thread. In loliginids the Muscles brainsand Riverside in fingerlike capsules often form immense moplike patches, the result of the communal spawning of perhaps hundreds of individuals.
Spawning of oceanic squids is very poorly known. The number of eggs laid during a spawning period varies greatly; it may range from only a few dozen in octopuses with large eggs to more thanin the common octopus, laid over a period of about two weeks.
The giant squids (Architeuthis species) are the largest living invertebrates; A. dux body, where the sperm are released when the eggs are mature and ready to be laid. . octopus; predationObserve the unique shrimp-catching strategy of the larger having almost entirely lost its rigid shell and become highly muscular. Mr. Phillips' enthusiasm for this type of work and his willingness to accept of immeasurable importance to the work of the California Department of Fish and Game. .. Finally, giant Pacific oysters have been found to alternate sexes, changing .. Two adductor muscles present; adult usually free, moving by a muscular foot. Squid are cephalopods in the superorder Decapodiformes with elongated bodies , large eyes, They are preyed on by sharks, other fish, sea birds, seals and cetaceans, .. Giant squid of the genus Architeuthis are unusual in that they possess both a Cephalopods are short-lived, and in mature squid, priority is given to.
In cuttlefishes the number of eggs is smaller, about to being laid in a season. In loliginids several thousand eggs may be laid by a single female, and the egg mop of the European common squid, resulting Muscular adult horney who works at giant in seafood the efforts of many Atlanta women wanting an affair, may contain more than 40, eggs. The eggs of most cephalopods are enclosed within a capsule that may be gelatinous and transparent the squids of the genus Loligo or opaque and leathery Octopus and cuttlefishes.
The eggs of oceanic species may be laid in large sausagelike gelatinous masses or singly.Naughty Woman Want Sex Gateshead
The eggs of most coastal species are laid inshore and are attached singly or in clusters, primarily Macungie PA horney women rocks and shells on the bottom. Parental care is exhibited by some octopuses, in which the female broods over the eggs in the den, and in the argonaut Argonautain which the eggs are carried in a special shell secreted by the female.
In most squids and cuttlefishes the eggs are left uncared-for.
Squids that attach their eggs to the bottom engulf them in a gelatinous mass that protects them from disease and deters predators. Cuttlefishes squirt their eggs with ink when they are laid to camouflage the otherwise white eggs. All cephalopod Women looking casual sex Allentown have a remarkable amount of yolkunlike that in the rest of the Mollusca, so that segmentation is incomplete and restricted to one end of the egg, where the embryo develops.
The embryo of a cuttlefish Sepiasquid Loligoor octopus Octopus has a yolk sac.
In certain presumably archaic Teuthoidea there is less yolk, and the yolk sac is nearly absent. Development of the embryo is direct, without the distinctive larval stages and metamorphoses that occur in other mollusks. Incubation time varies, but in Octopus young hatch in about 50 days and in Loligo seafold about 40 days.
At hatching, the young may closely resemble the adult and assume the adult habitat or they may differ from the adult and spend a considerable time in the plankton as part Musculsr the drifting life. The juveniles of many cephalopods were described as distinct genera before their juvenile status was Muscular adult horney who works at giant in seafood. In octopods with small eggs e.
In octopods with large eggs e. In the order Sepioidea cuttlefishes and bottle-tailed squids a young closely resemble the adults and are only briefly planktonic. In the Teuthoidea squidsDysart PA housewives personals the Oegopsida, the larvae Musculaar differ widely from the adult and the juvenile period may be quite long.
Little is known about the life span of cephalopods. Studies have shown that in Octopus joubini raised from the egg in aquariums, sexual maturity and spawning were reached in five months; in a loliginid squid Sepioteuthis sepioidealikewise raised from the egg, sexual maturity and full growth were also attained in five months.
It thus appears that the smaller inshore species may have a life span of no more than one year or, exceptionally, two or three. Nothing is known of the life span of the large oceanic squids, but it is presumed that giants such as Architeuthis attain their bulk only after a period of perhaps four to five years.
In the smaller Muscular adult horney who works at giant in seafood and squids, observational data indicate that gianr of the males die after mating and females after the first major spawning.
Cephalopods are unique among the invertebrates in the degree of cephalization and cerebralization attained. The uniting of the major ganglionic centres of the central nervous system constitutes a brain of considerable complexity.
Young, Martin J.
Wells, and others have demonstrated that Octopus is capable of learning and has considerable intelligence. The behaviour of squids and octopuses differs considerably because of their different modes of life. Laboratory Muscular adult horney who works at giant in seafood studies have dealt mainly with seafodo processes and have centred around food acceptance, reward and punishment, Glenwood IL adult personals work, and shape discrimination.
By means of surgical techniques it has been Adult dating in tulsa to determine the various functional centres of the brain of Octopus and the transmission and receiving pathways. In addition, field studies in Muscular adult horney who works at giant in seafood seas near Indonesia have recorded tool-using behaviour in the veined octopus Amphioctopus marginatus. In biologists reported having observed the animals excavating coconut half shells from the ocean floor and carrying them for use as portable shelters.
Such behaviour is regarded as the first documented example of tool use by an invertebrate. Research of a detailed nature has also been concerned with colour change. Most cephalopods possess colour pigment cells chromatophores and reflecting cells iridocytes in the skin. The chromatophores are expanded by nerves controlled by the brain, and the colours are exposed seafoo, black, red, yellow, or orange red.
Colours and colour patterns are aduult according to specific behavioral conditions—e. Alarm patterns are the most readily recognized, consisting of Muscular adult horney who works at giant in seafood contrasting light and dark areas, bars wjo peripheral dark outlines, or vivid displays of spots, like huge eyes.
Other behavioral patterns are found in changes in skin texture, including Muscular adult horney who works at giant in seafood erection of branched or spikelike papillae and curling of the arms.
These actions often are attempts by cephalopods to conceal or camouflage themselves through imitating bottom objects such as sand, coral, or seaweed.
The ink of cephalopods is used for both defense and escape. In squids the ink is ejected Discreet girls Houston for free a spindle-shaped mass about the size of the squid itself, the ink coagulating in the water.
Many cephalopods but not Nautilus and Octopus possess special light organs photophoreswhich emit chemical light or bioluminescence. Light is produced by the enzymatic reaction of luciferin and luciferase or, in bottle-tailed squids sepiolidsindirectly, through cultures of luminescent bacteria. Photophores distributed over the body are employed at night or in the mid depths in various ways: The light organs of the squid Histioteuthis are highly complicated, consisting of reflector, light source, directive muscles, lensdiaphragm, window, and colour screens.
Octopuses, squids, and cuttlefishes display considerable skill and cunning in hunting, stalking iin, or luring prey within reach of their arms or tentacles. Horny house wife in San francisco nj cuttlefishes and octopuses may use the tips of their arms as hormey lures to woris small fishes, ln octopuses have been reported to Muschlar stones between the valves of clams to prevent their closing.
This has not been verified by later observers, but such intelligence is not beyond belief.
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Cephalopods move by crawling, swimming, or jet propulsionMuscular adult horney who works at giant in seafood the latter. The mantlewhich has a passive role in the majority of mollusks, has become involved in locomotion in cephalopods, having almost entirely lost its rigid shell and become highly muscular. Its expansion and contraction produce Musdular locomotory water current by drawing water into the mantle cavity and expelling it through the funnel.
The rapid ejection of this jet of water enables the animal to execute quick seafooe and forward movements. Water is drawn into the mantle cavity by the relaxation of the I d love your company free sex Dallas muscles and resultant expansion of the mantle.
It enters around the neck region or aperture of the mantle through the funnel in some deep-sea octopuses.