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29 cze 2022 · The five main groups of vertebrates are fish, amphibians, reptiles, birds, and mammals. There are actually more categories, since bony fish are separate from jawless fish (lampreys and hagfish), cartilaginous fish (sharks and rays), and lobe-fin fish (lungfish and coelacanths).
Fishes are a paraphyletic group, since any clade containing all fish, such as the Gnathostomata or (for bony fish) Osteichthyes, also contains the clade of tetrapods (four-limbed vertebrates, mostly terrestrial), which are usually not considered fish.
Fish are cold-blooded animals that live exclusively in water, while mammals are warm-blooded and can live in various habitats, including land and water. Fish have gills to extract oxygen from water, while mammals have lungs to breathe air.
6 Basic Animal Classes. The 6 Types of Animals: Mammals, Reptiles, Amphibians, and More. ThoughtCo. By. Bob Strauss. Updated on June 01, 2024. Animals are complex, multicellular organisms equipped with nervous systems and the ability to pursue or capture their food, and they can be divided into six broad categories.
21 maj 2024 · Fish are aquatic vertebrates that typically have gills, fins, and a streamlined body. They inhabit diverse environments, from freshwater rivers and lakes to salty oceans and deep seas.
29 wrz 2024 · Fish, any of approximately 34,000 species of vertebrate animals (phylum Chordata) found in the fresh and salt waters of the world. Living species range from the primitive jawless lampreys and hagfishes through the cartilaginous sharks, skates, and rays to the abundant and diverse bony fishes.
In fact, there are about as many species of fishes than there are of all other vertebrates combined (Fig. 4.4). Of the nearly 50,000 species of animals with backbones, approximately 4,500 are mammals, 9,700 are birds, 6,500 are reptiles, 4,000 are amphibians, and 25,000 are fishes.
