An aquatic animal is an animal Animals are a major group of mostly multicellular, eukaryotic organisms of the kingdom Animalia or Metazoa. Their body plan eventually becomes fixed as they develop, although some undergo a process of metamorphosis later on in their life. Most animals are motile, meaning they can move spontaneously and independently. All animals are also, either vertebrate Vertebrates are members of the subphylum Vertebrata, chordates with backbones or spinal columns. About 58,000 species of vertebrates have been described. Vertebrata is the largest subphylum of chordates, and contains many familiar groups of large land animals. Vertebrates comprise cyclostomes, bony fish, sharks and rays, amphibians, reptiles, or invertebrate An invertebrate is an animal without a skeletal structure. The group includes 95% of all animal species — all animals except those in the Chordate subphylum Vertebrata, which lives in water for most or all of its life. It may breathe air or extract its oxygen from that dissolved in water through specialised organs called gills A gill is an anatomical structure found in many aquatic organisms. It is a respiration organ whose function is the extraction of oxygen from water and the excretion of carbon dioxide. The microscopic structure of a gill is such that it presents a very large surface area to the external environment, or directly through its skin. Natural environments The natural environment, commonly referred to simply as the environment, is a term that encompasses all living and non-living things occurring naturally on Earth or some region thereof and the animals that live in them can be categorized as aquatic (water) or terrestrial An ecoregion , sometimes called a bioregion, is an ecologically and geographically defined area smaller than a "realm" or "ecozone". Ecoregions cover relatively large areas of land or water, and contain characteristic, geographically distinct assemblages of natural communities and species. The biodiversity of flora, fauna and (land). Animals that move readily from water to land and vice versa are often referred to as amphibious.
The term aquatic can in theory be applied to animals that live in either freshwater Freshwater is naturally occurring water on the Earth's surface in bogs, ponds, lakes, rivers and streams, and underground as groundwater in aquifers and underground streams. Freshwater is characterized by having low concentrations of dissolved salts and other total dissolved solids. The term specifically excludes seawater and brackish water or saltwater Seawater is water from a sea or ocean. On average, seawater in the world's oceans has a salinity of about 3.5%. This means that every 1 kilogram of seawater has approximately 35 grams (1.2 oz) of dissolved salts (mostly, but not entirely, the ions of sodium chloride: Na+, Cl−). The average density of seawater at the ocean surface is 1.025 g/ml;. However, the adjective marine An ocean (from Greek Ωκεανός, Okeanos ) is a large body of saline water, and a principal component of the hydrosphere. Approximately 71% of the Earth's surface (~3.61 X 1014 m2) is covered by ocean, a continuous body of water that is customarily divided into several principal oceans and smaller seas is most commonly used for animals that live in saltwater, i.e. in oceans, seas, etc.
Aquatic animals (especially freshwater animals) are often of special concern to conservationists Conservation is an ethic of resource use, allocation, and protection. Its primary focus is upon maintaining the health of the natural world: its forests, fisheries, habitats, and biological diversity. Secondary focus is on materials conservation and energy conservation, which are seen as important to protect the natural world. Those who follow the because of the fragility of their environments.
Air breathing aquatic animals
In addition to water breathing animals,e.g., fishes, mollusks etc., the term "aquatic animal" can be applied to air-breathing aquatic or sea mammals Aquatic and semi-aquatic mammals are a diverse group of mammals that dwell partly or entirely in bodies of water. They include the various marine mammals, who dwell in oceans, as well as various freshwater species, such as the Platypus, the European Otter. The classification all species of manatee save the West Indian manatee and the Amazon River such as those in the order Cetacea The order Cetacea (pronounced /sɨˈteɪʃə/, L. cetus, whale, from Greek) includes whales, dolphins, and porpoises. Cetus is Latin and is used in biological names to mean "whale"; its original meaning, "large sea animal", was more general. It comes from Ancient Greek κῆτος (kētos), meaning "whale" or " (whales Whale is the common name for marine mammals of the order Cetacea. The term whale is sometimes used to refer to all cetaceans, but in more common English usage it generally excludes the members of the Delphinoidea superfamily, such as dolphins and porpoises. These smaller species belong to the suborder Odontoceti , which also includes the sperm), which cannot survive on land, as well as four-footed mammals Mammals are a class of vertebrate animals whose females are characterized by the possession of mammary glands while both males and females are characterized by sweat glands, hair, three middle ear bones used in hearing, and a neocortex region in the brain like the river otter Otters are semi-aquatic fish-eating mammals. The otter subfamily Lutrinae forms part of the family Mustelidae, which also includes weasels, polecats, badgers, as well as others. With thirteen species in seven genera, otters have an almost worldwide distribution. They mainly eat aquatic animals, predominantly fish and shellfish, but also other (Lutra canadensis) and beavers (family Castoridae The family Castoridae contains the two living species of beaver and their fossil relatives. This was once a highly diverse group of rodents, but is now restricted to a single genus, Castor).
Aquatic animals include for example the seabirds, such as gulls (family Laridae Gulls are birds in the family Laridae. They are most closely related to the terns (family Sternidae) and only distantly related to auks, skimmers, and more distantly to the waders. Until recently, most gulls were placed in the genus Larus, but this arrangement is now known to be polyphyletic, leading to the resurrection of several genera), pelicans (family Pelecanidae A pelican is a large water bird with a distinctive pouch under the beak, belonging to the bird family Pelecanidae), and albatrosses (family Diomedeidae Albatrosses, of the biological family Diomedeidae, are large seabirds allied to the procellariids, storm-petrels and diving-petrels in the order Procellariiformes . They range widely in the Southern Ocean and the North Pacific. They are absent from the North Atlantic, although fossil remains show they once occurred there too and occasional), and most of the Anseriformes The order Anseriformes contains about 150 living species of birds in three extant families: the Anhimidae , Anseranatidae (the Magpie Goose), and the Anatidae, which includes over 140 species of waterfowl, among them the ducks, geese, and swans (ducks, swans and geese).
Amphibious Amphibians , such as frogs, toads, salamanders, newts, and caecilians, are ectothermic (or cold-blooded) animals that metamorphose from a juvenile water-breathing form, to an adult air-breathing form. Though amphibians typically have four limbs, the Caecilians are notable for being limbless. Unlike other land vertebrates (amniotes), amphibians lay and amphibiotic animals, like frogs Frogs are amphibians in the order Anura , formerly referred to as Salientia (Latin salere (salio), "to jump"). Most frogs are characterized by long hind legs, a short body, webbed digits (fingers or toes), protruding eyes and the absence of a tail. Frogs are widely known as exceptional jumpers, and many of the anatomical characteristics (the order Anura Frogs are amphibians in the order Anura , formerly referred to as Salientia (Latin salere (salio), "to jump"). Most frogs are characterized by long hind legs, a short body, webbed digits (fingers or toes), protruding eyes and the absence of a tail. Frogs are widely known as exceptional jumpers, and many of the anatomical characteristics), while they do require water, are separated into their own environmental classification. The majority of amphibians (class Amphibia Amphibians , such as frogs, toads, salamanders, newts, and caecilians, are ectothermic (or cold-blooded) animals that metamorphose from a juvenile water-breathing form, to an adult air-breathing form. Though amphibians typically have four limbs, the Caecilians are notable for being limbless. Unlike other land vertebrates (amniotes), amphibians lay) have an aquatic larval A larva is a young (juvenile) form of animal with indirect development, going through or undergoing metamorphosis (for example, insects, amphibians, or cnidarians) stage, like a tadpole A tadpole, polliwog , or pollywiggle (also polliwiggle, polwiggle, or porwiggle) is the wholly aquatic larval stage in the life cycle of an amphibian, particularly of a frog or toad, but then live as terrestrial adults, and may return to the water to mate.
References
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... is expected to attend, along with scientists that study lichens and mushrooms, nematodes, butterflies, worms, aquatic invertebrates and other animals .
Scientists converge on park for research Billings Gazette
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It uses its tentacles to gather up food that drifts by in the current and then cleans its tentacles with its mouth Diagrammed below is sticky fingers mouth and stomach and intestines Here is a diagram of cellular animal evolution on Javs
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Mon, 10 Aug 2009 17:00:00 GM
Many Second World War submarines had . aquatic animal. names and a mascot to match. Staff have now been handed a copper terrapin from HMS Terrapin, and a carved wooden sunfish from the officers' mess of HMS Sunfish. ...
