The key characteristics of insects include: Insects are classified within the following taxonomic hierarchy: Animals > Invertebrates > Arthropods > Hexapods > Insects. Insects have digestive organs, including a stomach and intestines, to absorb nutrients from their food and separate waste matter. Scientists estimate there are over 1 million insect species on the planet, living in every conceivable environment from volcanoes to glaciers. Parasitic lice (Phthiraptera) - There are about 5,500 species of parasitic lice alive today. Insects are cold blooded and have six legs, three main body parts and an exoskeleton. from Insects; 750L - 890L. ), 4. Thrips (Thysanoptera) - There are more than 4,500 species of thrips alive today. A simple eye contains just a single lens. Be on the lookout for your Britannica newsletter to get trusted stories delivered right to your inbox. As adults, their bodies are segmented into three parts: head, thorax, and abdomen. Most often, insect species are classified based … It is most often divided into 29 orders. There are more than one million insect species in the world today and they are the most diverse group of creatures in the world. But none have all the same traits that insects share. As you learn more about insects, you will find there are some exceptions to these rules.
Insects usually lays eggs and sometimes give birth to live young ones. https://projects.ncsu.edu/cals/course/ent425/index.html, M.S., Applied Ecology, Indiana University Bloomington, B.S., Biology and Chemistry, University of Illinois at Urbana-Champaign. Insects that go through this change include butterflies, true flies and beetles. Some insect taxonomists organize the insects differently, using evolutionary links instead of physical traits. These include (Kristensen, 1991): lack of musculature beyond the first segment of antenna. Insects body can be divided into three main parts called the head, thorax and abdomen. Even so, they all share certain features. Insects that go through an incomplete metamorphosis look very similar to adults of the same species, only smaller.
The thorax is where the legs and wings attach. Entomologists, scientists who study insects, might also add that insects have a pair of antennae and external mouthparts.
ThoughtCo uses cookies to provide you with a great user experience and for our, Insect Classification - Subclass Pterygota and Its Subdivisions, The Insect Index - Sorted by Scientific Names, How to Distinguish Between a Dragonfly and a Damselfly, The Types and Stages of Insect Metamorphosis, The Malacostraca Family: Crabs, Lobsters, and Their Relatives. They parasitize a variety of insects including grasshoppers, leafhoppers, bees, wasps, and many others. Insects have mouthparts designed to help them feed on different things. Compound eyes are usually large with many lenses, giving the insect a complex image of its surroundings. These antennae help them locate food and sense danger from predators. Other insects have chewing mouthparts and eat leaves or other plant matter. Get exclusive access to content from our 1768 First Edition with your subscription. After pupating, adult male twisted-wing parasites leave their host. Butterflies and moths have wings made of overlapping scales, often in brilliant colors. With more than a million species, insects are almost half of all living things on this earth.
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