What is the internal anatomy of an anglerfish?
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adaptation in anglerfish is their sexual dimorphism. The males are very small in comparison with the females, and live as permanent parasites on the female. The male attaches himself, by biting, to the body of the female. His mouth fuses with her skin, and the bloodstreams of the two fishes become connected. The male is now totally dependent on the female for nourishment. In fact, the male begins to degenerate. His eyes grow smaller and he eventually loses them. His internal organs disappear.The male becomes simply a source of sperm.\n\npl look at the sites they may be of help.
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spiral valve (shaped like a spiral staircase) fills the cylindrical intestines and allows absorption of the food in a short span of intestine.\nA spiral valve is the lower portion of the intestine of some sharks, rays and skates. A modification of the ileum, the spiral valve is internally twisted or coiled to increase the surface area of the intestine, to increase nutrient absorption\n\nThe intestine of a shark, in comparison to that of mammals, is much shorter. Sharks have compensated for this problem by having a spiral valve, or a scroll valve, inside the intestine to increase the absorptive surface of the intestine.
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to DIssect a bony fish you must pin it on your dissection tray ventral side up (belly up), and then cut with your scalpel carefully a small cut (0.5inch) at the cloaca (anus). Then insert dissection scissors, pointed end in the fish's cloaca, and cut to the head until you reach its mouth.\n\nHave fun.
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Most arthropods: insects, lobsters, shrimp, crabs, etc. all have a tubular heart on the dorsal area just under the thorax, cephalothorax. Your vertebrates begin the two chamber linage.
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Fishes have well-developed nervous systems that organize around a central brain, that is divided into different parts. The most anterior, or front, end of the brain are the olfactory bulbs, which are involved in the fish's sense of smell. Unlike most vertebrates, the cerebrum of the fish is primarily processes the sense of smell rather than being responsible for all voluntary actions. The optic lobes process information from the eyes. The cerebellum coordinates body movements while the medulla oblongata controls the functions of internal organs. Most fishes possess highly developed sense organs. Nearly all daylight fish have well-developed eyes that have color vision that is at least good as a human's. Many fish also have specialized cells known as chemoreceptors that are responsible for extraordinary senses of taste and smell. Although they have ears in their heads, many fish may not hear sounds very well. However, most fishes have sensitive receptors that form the lateral line system. The lateral line system allows for many fish to detect gentle currents and vibrations, as well as to sense the motion of other nearby fish and prey. Some fishes, such as catfish and sharks, have organs that detect low levels electric current. Other fishes, like the electric eel, can produce their own electricity.
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hey! read a fish book. they always how a diagram of disecting parts or body anatomys. hint: for more info... go to this website:
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Isn't this something they're trying to teach you at school? Think of the origins and insertions of these muscles, and of the movements achieved when each muscle layer contracts. Look at the pictures in any good Comparative Anatomy book and check the difference between the muscles of fishes and tetrapods (hint: new feature- lungs).
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Yes, male fishes have paired testicles inside their bodies. Fish sperm looks like a viscous fluid; fish spermatozoids don't look much different from our own (I'd say more like a tadpole than a fish).\nHere's a photograph of a spermatozoid from a fish:\nhttp://cmif.osu.edu/images/department/transmission_3.jpg
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Hi, those measurements will vary according to the species and individuals, and there are many!!\nI suggest two possible sources of measurements: \n1) Papers about morphometry of any stingray (they all belong to the family Myliobatidae - may be considered subfamily Myliobatinae). See below for a good search engine for papers.\n2) Fishbase (link at the bottom), a good reliable source. They have measurement data for some species.\n\nStingrays, in contrast to "real" rays, are not so flat, their heads (especially eyes and spiracles) are raised above the disk, so the thickness will vary according to the place where the measurement is taken, but usually this measurement reflects the maximum thickness. Consider this when you calculate the volume!\nThe shape of the disk also varies according to the genera, so be sure to check it. In particular, the freshwater stingrays (genus Potamotrygon) are almost perfectly circular.\n\nBut well, to make it simpler, Myliobatis are fairly common in the South Atlantic. Here's a paper with measurements for two species:\nhttp://www2.uerj.br/~dbav/equipe/gallo/myliobatis.pdf
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go to this link, you will find out where it is in the pic:\n\nhttp://www.coolnurse.com/anatomy.htm
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morpho anatomy is the anatomy of a creature that can change. such as a worm, changing into a buttefly.
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cephalochordates should be examined vis a vis Hemichordates and urochordates. According to older classification these are the the three sub phyla of the phylum chordata.\nThe salient features of cephalochordates is the notochord that extends up to the head region.In chordates the notochord gives rise to the vertebral column and hence it should not extend up to the head region as the first neck vertebra starts from the posterior part of the skull.\nOther important features of cephalochordates include the presence of circulatory system, excretory system formed by flame cells(protonephridia), presence of wheel organ, Hatschek' pits, ciliary mode of feeding, presence of atrial apertures, segmental musculature, presence of epipharyngeal groove and endostyle, ciliated pharynx. Ductless gonads.Two dorsal aortae.
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Fish ... as a surrealist would say .... :)
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Any of numerous cold-blooded aquatic vertebrates of the superclass Pisces, characteristically having fins, gills, and a streamlined body
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Digestive system\nThe advent of jaws allowed fish eat a much wider variety of food, including plants and other organisms. In fish, food is ingested through the mouth and then broken down in the esophagus. When it enters the stomach, the food is further broken down and, in many fish, further processed in fingerlike pouches called pyloric ceca. The pyloric ceca secrete digestive enzymes and absorb nutrients from the digested food. Organs such as the liver and pancreas add enzymes and various digestive chemicals as the food moves through the digestive tract. The intestine completes the process of digestion and nutrient absorption.\n\n[edit]\nRespiratory system\nMost fish exchange gases by using gills that are located on either side of the pharynx. Gills are made up of threadlike structures called filaments. Each filament contains a network of capillaries that allow a large surface area for the exchange of oxygen and carbon dioxide. Fish exchange gases by pulling oxygen-rich water through their mouths and pumping it over their gill filaments. The blood in the capilaries flows in the opposite direction to the water, causing counter current exchange. They then push the oxygen-poor water out through openings in the sides of the pharynx. Some fishes, like sharks and lampreys, possess multiple gill openings. However, most fishes have a single gill opening on each side of the body. This opening is hidden beneath a protective bony cover called an operculum. Some fishes, such as lungfish, have developed an adaptation that allows them to survive in oxygen-poor areas or places where bodies of water constantly dry up. These species of fish possess specialized organs that serve as lungs. A tube brings air containing oxygen to this organ by way of the fish's mouth. Some kinds of lungfish are so dependant on receiving oxygen from the air that they will suffocate if not allowed to reach the surface of the water.\n\n[edit]\nCirculatory system\nFishes have a closed circulatory system with a heart that pumps the blood in a single loop throughout the body. The blood goes from the heart to gills, from the gills to the rest of the body, and then back to the heart. In most fishes, the heart consists of four parts: the sinus venosus, the atrium, the ventricle, and the bulbus arteriosus. Despite consisting of four parts, the fish heart is still a two-chambered heart. The sinus venosus is a thin-walled sac that collect blood from the fish's veins before allowing it to flow to the atrium, which is a large muscular chamber. The atrium serves as a one-way compartment for blood to flow into the ventricle. The ventricle is a thick-walled, muscular chamber and it does the actual pumping for the heart. It pumps blood to a large tube called the bulbus arteriosus. At the front end, the bulbus arteriosus connects to a large blood vessel called the aorta, through which blood flows to the fish's gills.\n\n[edit]\nExcretory system\nAs with many aquatic animals, most fishes release their nitrogenous wastes as ammonia. Some of the wastes diffuse through the gills into the surrounding water. Others are removed by the kidneys, excretory organs that filter wastes from the blood. Kidneys help fishes control the amount of ammonia in their bodies. Saltwater fish tend to lose water because of osmosis. In saltwater fish, the kidneys concentrate wastes and return as much water as possible back to the body. The reverse happens in freshwater fish, they tend to gain water continuously. The kidneys of freshwater fish are specially adapted to pump out large amounts of dilute urine. Some fishes have specially adapted kidneys that change their function, allowing them to move from freshwater to saltwater.\n\n[edit]\nSensory and nervous system\nFishes have well-developed nervous systems that organize around a central brain, that is divided into different parts. The most anterior, or front, end of the brain are the olfactory bulbs, which are involved in the fish's sense of
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It is a mollusk that can partly come out of its body. It has mouth and other feeding organs with the help of which it can feed.
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Mollusks are triploblastic protostomes. The principal body cavity is a blood-filled hemocoel. It is unknown whether they have a true coelom (eucoelom); any coelomic cavities have been reduced to vestiges around the hearts, gonads, and metanephridia (kidney-like organs). The body is often divided into a head, with eyes or tentacles, a muscular foot and a visceral mass housing the organs.\n\nMollusks have a mantle, which is a fold of the outer skin lining the shell, and a muscular foot that is used for motion. Many mollusks have their mantle produce a calcium carbonate external shell and their gill extracts oxygen from the water and disposes waste. All species of the phylum Mollusca have a complete digestive tract that starts from the mouth to the anus. Many have a feeding structure, the radula, mostly composed of chitin. Radulae are diverse within the Mollusca, ranging from structures used to scrape algae off rocks, to the harpoon-like structures of cone snails. Cephalopods (squid, octopuses, cuttlefish) also possess a chitinous beak. Unlike the closely related annelids, mollusks lack body segmentation.\n\nDevelopment passes through one or two trochophore stages, one of which (the veliger) is unique to the group. These suggest a close relationship between the mollusks and various other protostomes, notably the Annelids.\n\nMollusk fossils are some of the best known and are found from the Cambrian onwards.