These are passed by the host animal and the cycle begins again. It feeds off the host animal and also lays its eggs in the host’s body. When the smaller host animal is eaten by a larger animal, the flatworm sets up a permanent home in its new host. Often the eggs of parasitic flatworms are eaten by a small animal, in whose body the flatworm undergoes the first stage of its development. This can be harmful and even deadly to the host animal. They make their way into a host organism and feed on its body from the inside. Flatworms have existed for hundreds of millions of years and were the first carnivorous hunters. They are the simplest animals to exhibit ‘ bilateral symmetry’ (i.e. These invertebrate animals range in size from microscopic species to tapeworms that can be up to 25m (82 ft.) in length.įlatworms lack a body cavity, and have neither a circulatory nor a respiratory system. One of the first scientists to realize that sponges were animals rather than plants was Aristotle.įlatworms Flatworm of genus Pseudobicerosįlatworms make up the the phylum Platyhelminthes. The sponge feeds on microorganisms contained within the water. The movement of the flagella causes water to move through the sponge. Inside a sponge’s body are cells with whip-like projections called flagella. Nearly all sponges are found in marine habitats, although there are a small number of freshwater sponges. (A phylum is a particular type of animal group you can find out more about the different types of animal groups further down the page.) Together, they make up the phylum Porifera. There are between 6,000 and 9,000 known species of sponge. They lack a nervous system and a stomach, and most species are capable of movement only in their juvenile form. Looking like bulbous, hollow plants, sponges are among the most basic of all animals. You can see more invertebrates on this page: Invertebrates Examples. Whereas vertebrates make up a single group of related animals (the subphylum Vertebrata), there are many different types of invertebrates some of which are more closely-related to vertebrates than they are to other invertebrates!īelow is a selection of the major invertebrate groups. The very first animals were invertebrates, and in the hundreds of millions of years since their appearance, invertebrates have diversified into a multitude of different types. Invertebrates are animals without a backbone. This page is an overview of the main types of animals there are many other animal groups, both living and extinct! If you want information on individual animal species, then check out this page: A To Z Animals With Pictures & Facts, where you’ll find pictures and facts on hundreds of amazing animals.Īt the bottom of the page you’ll find important information on the animal kingdom and how scientists group animals into different types. In each section, you’ll meet examples of different types of animals within these larger groups. The page is divided into two main sections: types of invertebrates and types of vertebrates. tiger and blue whale), the list below features examples of the major groups of animals – groups such as mammals, insects, and reptiles. Instead of containing examples of individual species (e.g. On this page is a list of the main types of animals. If the question sheet opens in your browser rather than downloading, right-click on the question sheet and select ‘download’. The Two “Main” Types of Animals: Invertebrates and Vertebratesįree Animals Question Sheet For Use With This Page Click image to download a free printable question sheet to test your animal knowledge!Ĭlick here or on the image above to view / download a free printable question sheet for use with this page.Different Types of Animals: Introduction.FREE question sheet (no sign-up required).Use the links below to find the information you need (or continue reading for a complete overview of the animal kingdom). ![]() You’ll learn the differences between these animal groups, and improve your understanding of the entire animal kingdom!ĭownload the FREE accompanying question sheet to test your animal knowledge! On this page is a list of the major animal types, with pictures and facts on each. Different types of animals include invertebrates such as sponges, flatworms, roundworms, cnidarians (jellyfish, anemones, etc.), mollusks (squid, octopuses, snails, clams, etc.), crustaceans, arachnids and insects and vertebrates such as fish, amphibians, reptiles, mammals and birds.
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