Classification of insects royal entomological society. Distinguish insecta, arachnida and crustacea anstree. Insects have a large number of unique, derived characteristics, although none of these are externally obvious in most species. The structure and classification of the arthropoda. Scientifically speaking, they all come under the animal kingdom under phylum arthropoda the success of the arthropods can mainly be attributed to the presence of exoskeleton, which. Romalea microptera beauvois, eastern lubber grasshopper schistocerca americana drury, american grasshopper schistocerca ceratiola hubbell and walker, rosemary grasshopper. Insects are the most successful life form on the planet. Compared to how long the class insecta has been around, ancient man has been in existence less than one tenth of the time, and modern man one 10,000th of the time, so we should admire the insects abilities to survive and endure, in spite of how annoying that mosquito is on your patio on the fourth of july. Classification of insects zoology for ias, ifos and other. Insects can experience pigment changes from eating certain foods or in some cases they can be manufactured by the insect. What are the characteristics of class insecta answers. Segmented bodies paired, segmented appendages bilateral symmetry exoskeleton dorsal heart and open circulatory system ventral nerve cord general.
The crustacean group includes barnacles, crabs, crayfish, lobsters, water fleas, and pill bugs. Place the underlisted insecta into their correct orders and give two reasons for your choice. About 1 million species of insects are described, but the total number of species is estimated to be between 2. Anatomy the three main parts of the body are the head, thorax, and adbomen. Learn more about insects, both their similarities and their differences. Insects classification for correction and improvements please use the comments section below. It is a phylum of triploblastic, haemocoelomic, segmented invertebrates having head, thorax and abdomen, a chitinous exoskeleton and jointed legs and appendages. Insects class insecta have segmented bodies, jointed legs, and external skeletons.
Arthropods are jointlegged animals and you must have come across a few of these animals. There are more species of insects than there are species of all other animals combined. Class hexapoda insecta insect characteristics most adult insects have the following characteristics. Insects photographic atlas of entomology and guide to insect identification how to know the immature insects insects and diseases of woody plants of the central rockies pests of the west. Terminology, classification and use of scientific names. The body is comprised of 3 distinct body regions head, thorax, and abdomen. Insects have a hard protective covering called an exoskeleton. Barnards book the royal entomological society book of british insects, published by wileyblackwell in 2011, and obtainable from the res. General characteristics and classification of arthropoda. Insect scientists entomologists categorize groups of living entities as how they are related through the theory of evolution. The anterior region of body is the head, which bears one pair of compound eyes, usually 3 simple eyes each of which called ocelli, one pair of unbranched antennae and paired mouthparts. Phylum arthropoda, subphylum mandibulata, class insecta. Insects which produce honey, wax, lac, dyes and silk are commercially beneficial.
In an order, there are classes, orders, suborders, families and genera, which constitute the living things that procreate with one another. What is the class insecta and what traits does it possess. Class insecta is the most diverse class of arthropods due to their short life spans, rapid reproduction, increased variation, and the potential for new adaptations. Class insecta definition of class insecta by the free. Entomology 101 the insects washington state university. An insects body has three major body parts, including a head, thorax and abdomen. Insects can live on land, in the water or both and are coldblooded creatures that require the sun to warm them. Typical adult insects have one pair of antennae, three pairs of legs, and three body regions. Whether an insect species is a pest depends on the situation. The class insecta the insects being such a large class of organisms their taxonomy and hence their classification can, and in fact does, get extremely complicated, with a large number of people discussing the merits of various taxonomic schemes. Learn vocabulary, terms, and more with flashcards, games, and other study tools. For each of the following characteristics, indicate whether the trait is common to phylum arthropoda or specific to certain classes of arthropods.
Here is an alphabetical list of insect orders in current usage with examples of insects types. In spiders, each chelicerae bears a fang into which. Insects insecta are the most diverse of all animal groups. Other areas have shown increases in some insect species, although trends in most regions are currently unknown. The questions in this quiz and worksheet will address these questions, helping you learn more about insects. Class insecta questions and study guide quizlet flashcards. As used here, the term insecta is synonymous with ectognatha. Over 150,000 living species of hymenoptera have been described, in addition to over 2,000 extinct ones. Lamarck, however, appears not to have insisted on this name hexapoda, and so the class of pterygote hexapods came to retain the groupname insecta, which.
Insects are a class in the phylum arthropoda, so they have all of the characteristics of the arthropods. Most adult insects have the following characteristics. Insects make up more than half of all living things in the world. Some insects are very helpful in destroying injurious insects. Classification of class insecta upto orders phylum. Body is divided into three parts, head, thorax and abdomen the distinguishing feature of insects. Body relatively flat, tapered and often covered with scales. Usually one pair of antennae and a pair of compound eyes a few exceptions to these characteristics are found. Insects or insecta from latin insectum are hexapod invertebrates and the largest group within the arthropod phylum. List four orders of the class insecta and for each give on example. What is the difference between insects and arthropods. Females typically have a special ovipositor for inserting eggs into hosts or places that are otherwise inaccessible.
Classification of class insecta insects flow chart. Because they lack backbones, they are invertebrates. Start studying zoology chapter class insecta exam three. Chitin exoskeleton that also contains protein jointed appendages have the ability to molt shed their exoskeleton 5. The study of form and function insects are arthropods.
The number of insect species outnumbers all other terrestrial animals and plants together. Claims of pending mass insect extinctions or insect apocalypse based on a subset of these studies have been popularized in news reports, but often extrapolate beyond the study data or hyperbolize study findings. Multiple choice questions on phylum arthropoda mcq biology. The class insecta is divided into some 29 to 40 major orders. I prefer to go in the opposite order, because the more advanced orders are more commonly. Their numbers are nothing short of remarkable both in terms of how many individual insects there are, as well as how many species of insects there are. The one i have followed here and throughout these pages is from imms 1984 and is a basically. Some prominent ones include insects, spiders, ants, bees, crabs, shrimps, millipedes, centipedes etc. Insecta definition, the class comprising the insects. To place this in perspective, the number of described chordates vertebrates, of. Segmented bodies paired, segmented appendages bilateral symmetry exoskeleton dorsal heart and open circulatory system ventral nerve cord general characteristics of insects. They were the first flying creatures and still the only invertebrates that can fly.
All habitats except saltwater replaced by crustacea there a. Apis, the honeybees produce millions of tons of honey every year, it also gives bees. Insects have a chitinous exoskeleton, a threepart body head, thorax and abdomen, three pairs of jointed legs, compound. Class insecta arthropoda plymouth state university. Within the class insecta, major forms of insects are grouped in orders. Classification of class insecta upto orders insect is a six legged arthropod. An insect is an arthropod, but insects also have a more specialized criteria that must. Primarily winglessevolved from wingless ancestors winged or secondarily wingless evolved from winged ancestors. O class insecta includes more than half of the all known living species. Abdomen contains the breathing organs, heart, digestive system. Hymenoptera is a large order of insects, comprising the sawflies, wasps, bees, and ants.
Classification of class insecta upto orders insect is a. A body divided into three parts head, thorax and abdomen three pairs of legs. There are more than one million living species in the world and many more yet to be discovered. O wings are on the second and third thoracic segment.
Bilateral symmetry true coelom body cavity ventral nerve cord 6. Insect classification insect taxonomy hein bijlmakers. It is the most diverse group of organisms on earth. Ordinallevel groups represent divergent lineages that are nearly always recognizable by a set of distinctive characteristics. In head a pair of antenna and a pair of compound eyes are usually present. More than 1 million of the categorized 2 million species are arthropods. Class insecta insects are the largest group of animals, which constitute 75% of all living animals. The thorax has three pairs of legs, and one or two pairs of wings in most insects. It also contains detailed information on all the 558 families of british insects. Insect, class insecta or hexapoda, any member of the largest class of the phylum arthropoda, which is itself the largest of the animal phyla. Insect, any member of the class insecta hexapoda, the largest class of phylum arthropoda, about 1 million species or threefourths of all animals. The head contains eyes, one pair of antennae and three pairs of appendages developed as mouth parts.
Although crabs and lobsters may look different, they share a common physiology. What are some characteristics of the class insecta answers. Although the insects numerically dominate the land as a group their predominance fades in the aquatic environment. Before one understands what social insects are it is first important to understand what an. Insects are an incredibly successful group, about 90% of all species are insects. Insects have segmented bodies, jointed legs, and external skeletons exoskeletons. O mouth parts are ectognathous mouth parts expoed o characteristically possess wings for flight. Thysanura silverfish firebrats bristle tail greek thysano meaning fringed ura meaning tail.
Spread the love classification of class insecta insects classification for correction and improvements please use the comments section below. Johnstons organ in pedicel second segment of antenna. Class insecta orders with examples biology education. Class insecta true insects are the m ost important members of the phylum arthropoda. A body divided into three parts head, thorax and abdomen. Insects are small arthropods with six legs and usually one or two. More discussion about this classification, with a list of more detailed references, can be found in peter c. Almost always, an adult insect can be readily determined to order at a glance. Insects are distinguished from other arthropods by their body, which is divided into three major regions.
General characteristics and classification of arthropoda arthropoda arthon jointed. In this article we will discuss about the economic importance of insects. Class insecta contains all insects and belong to the phylum arthropoda. In fact, there are so many insects that no one knows quite how to count them all the. Adelges tsugae annand 1928, hemlock woolly adelgid. Insect orders with a complete life cycle conventionally, insect orders are studied from those which are considered to be the most primitive, progressing through those which are more advanced ies, moths, bees, and beetles. The ability to fly has played an important role in their spectacular radiation on land. This means that a certain insect could be a pest in one situation, but the same insect would be neutral in another situation. A typical adult insect has three distinct body regions.
1473 1112 582 993 465 654 1609 1222 452 911 258 1444 1667 1348 660 111 489 1645 390 1662 965 1437 236 1239 585 1394 1435 1497 1535 1421 68 167 1612 1301 1428 602 211 1329 1261 3 432