Characteristics a. Ø A large taxa, includes insects and a small group of wingless arthropods Ø Body plan: 3 parts, head, thorax and abdomen Ø Head with six segments Ø Thorax with three pairs of jointed legs (hence the name hexapoda) 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. Its primary function is dispersal and reproduction. Usually two pairs of wings (absent in many insects such as lice, fleas, ants; flies have one pair of wings) Endopterygota; Exopterygota Division Endopterygota internally developed wings; fleas and flies +5 more terms Class Insecta - The insects A Introduction 1. Characteristics of Insect Class Insecta 1. Insects are a class in the Phylum Arthropoda, so they have all of the characteristics of the Arthropods. Sub-phylum: Hexapoda Body is divided into three parts, head, thorax and abdomen - the distinguishing feature of insects: Head has one pair of antennae. Thorax (middle bit) has three pairs of … Most All habitats except saltwater - replaced by crustacea there a. Freshwater b. Terrestrial c. … An insect's body has three major body parts, including a head, thorax and abdomen. The additional characters includes: Ø largest taxa of all animals and plants, Ø Includes more than one million described species, Ø Class Insecta includes more than half of the all known living species, Ø * Mouth parts are ectognathous (=mouth parts expoed), Ø * Characteristically possess wings for flight, Ø Wings are on the second and third thoracic segment, (* Characters with separate class insect from Enthognatha, the second class of sub-phylum Hexapoda), @. General characteristics of Insects (class):- Insects are the most successful life form on the planet: they make up more than half of all living things on Earth- Some experts suggest that there are more than 10 million insects- Divided into 29 orders An adult insect (imago) eventually emerges from within the pupal exoskeleton bearing little or no resemblance to its larval form. The insects take in air using tracheae which are a system of tubes placed throughout the body. Because they lack backbones, they are invertebrates. 471 People Used The number of insect species outnumbers all other terrestrial animals and plants together. Most adult insects have the following characteristics: 1. Class Insecta characteristics 3 pairs of legs, segmented, antennae Subclass Pterygota winged insects 2 Divisions in Insecta? Insects have a large number of unique, derived characteristics, although none of these are externally obvious in most species. Class Insecta Characteristics: What kind of skeleton do they have? Exoskeleton is covered with sensory organs such as compound eye. Other species undergo a more gradual process, in which the newly hatched young are more similar to the adult but are small in size, lack wings, are sexually immature, and may differ in other, relatively minor ways as well. ... Insects show a remarkable variety of morphological characteristics, but they are much more homogeneous in tagmatization than are Crustacea. Body is divided into three regions 2. They exhibit organ system level of organization. Have outer covering known as exoskeleton. In the class Insecta, only 9 out of 28 orders undergo complete metamorphosis, yet these 9 orders represent about 86% of all insect species alive today. Reproductive capacity is enormous and larval stages grow by molting (ecdysis). Three pairs of legs 1.3. The body is divided into head, thorax, and abdomen. Insects form the larger part of the land animals in Class Insecta of Phylum Arthropoda has undergone and continues to undergo changes in its classification. Short life cycle, numerous egg laying periods. The earth is literally crawling and buzzing with insects, otherwise known as members of the class insecta. Class 1 : Insecta. Insects can experience pigment changes from eating certain foods or in some cases they can be manufactured by the insect. All insects have four pairs of appendages, one pair on the head and three pairs on the thorax. Insect, (class Insecta or Hexapoda), any member of the largest class of the phylum Arthropoda, which is itself the largest of the animal phyla. Class - Insecta. All Arachnids have multiple legs and look like Insects, the only difference is that Insects have six leg and Arachnids have 8 legs. Insect scientists (Entomologists) categorize groups of living entities as how they are related through the Theory of Evolution. Usually one pair of antennae and a pair of compound eyes (a few exceptions to these characteristics are found) 1.4. With so many catalogued insects in the world, it only makes sense for researchers to develop a contained system of orders. Habitat: Some live on land and some can even live on top of the water. It would be hard to get through the day without a close encounter with a six-legged species. In North America alone, there are about 8,000 arachnid species. Arachnids are a Class (Arachnida) of joint-legged Invertebrate Animals in the subphylum Chelicerata. 5. In many cases this can be true however many species can be beneficial. Praying Mantis Lady Bug Metallic Ceiba Bug Organisms: Monarch Butterfly What are two examples of insecta? Insects are small animals which have the body divided into three regions, the head, thorax and abdomen. Insects are so prolific that added together they outnumber all other life forms combined. Class Insecta Insecta (L. insectus, cut into) are the most diverse and abundant of all groups of arthropods. They are largely terrestrial and solitary Animal, gathering only for mating. The Class Insecta, or the slightly larger Superclass Hexapoda (which additionally includes the orders Collembola, Protura and Diplura), is the world's most species-rich group of organisms, with about 1 million described species. Insects are many times thought to be bad for plants and animals. Choose from 349 different sets of class insecta flashcards on Quizlet. Kingdom: Animalia Insects are the only arthropods with wings. Characters of class Insecta 1. Here is an alphabetical list of insect orders in current usage with examples of insects types: 1. Learn class insecta with free interactive flashcards. Ø Class Insecta includes more than half of the all known living species Ø Usually terrestrial, some are aquatic Ø Usually absent in marine environments Ø * Mouth … 3 pairs of legs b. Sub-kingdom: Eumetazoa Phylum: Arthropoda Characteristics. THE CLASS INSECTA. Difference between Centipedes and Millipedes. There are more species of insects than species of all other classes of animals combined. These appendages are all jointed and usually elongate. •Front wings (elytra) are hard and serve as covers for the hind wings; meet in a line down the middle of the back. 2 pairs of wings (most) except flies (1 pair of wings - Diptera) B. Scientists describe more than 100,000 species of arachnids. Insects that experience this sort of complete change are called "holometabolous." Arthropods, members of the phylum Arthropoda, are a diverse group of animals including insects, crustaceans, spiders, scorpions and centipedes. Modern insects are highly adapted to an immense range of habitats throughout the world, from deserts to snowfields, from rainforest to savannah. In majority of them larval stage is different from the adult and there is a distinct metamorphosis. Enter your e-mail address. Coleoptera Beetles 3. Muliticellular or unicellular? Class Insecta is divided into two subclasses, namely, Apterygota and Pterygota. 3 main tagmata. Body is divided into three parts, head, thorax and abdomen - the distinguishing feature of insects: Head has one pair of antennae. They are found on land, in the air, and in the sea. Phylum Arthropoda, Class Insecta The focus is a typical insect, showing all the characteristics of the class. Coleoptera (beetles and weevils) is the largest order in the class Insecta. However, the members of this phylum, despite their incredible diversity and sheer numbers, share a number of important distinguishing characteristics. Insects have ability to fly and can still use legs effectively. Insects have segmented … And the diversity is astounding. General characters of class insecta • These are tracheated arthropods • It possesses 3 pairs of jointed legs • Body is segmented • Insect body is divided into 3 regions • Head • Thorax • Abdomen • It possesses a pair of compound eyes & antennae • Two pair of … Insects or Insecta (from Latin insectum) are hexapod invertebrates and the largest group within the arthropod phylum.Definitions and circumscriptions vary; usually, insects comprise a class within the Arthropoda. 2. From the minuscule pesky flea to the majestic monarch butterfly, there are … In fact, most animal species are insects. Insects can live on land, in the water or both and are cold-blooded creatures that require the sun to warm them. Although the insects numerically dominate the land as a group their predominance fades in the aquatic environment. Basic Features: Insects are a class in the Phylum Arthropoda, so they have all of the characteristics of the Arthropods. Insects have a hard protective covering called an exoskeleton. The arthropoda characteristics are mentioned below: The body is triploblastic, segmented, and bilaterally symmetrical. b The cuticle of each body segment is made of four plates, sclerites connected to each other by a flexible hinge joint c The heads of insects usually have a pair of large compound eyes, a pair of ocelli (simple eyes), and a pair of antennae. •Chewing mouthparts (sometimes located at the tip of a beak). Thorax (middle bit) has three pairs of legs. A body divided into three parts (head, thorax and abdomen) 1.2. Insects (Insecta) are the most diverse of all animal groups.There are more species of insects than there are species of all other animals combined. In fact, there are so many insects that no one knows quite how to count them all — … 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 ability to fly has played an important role in their spectacular radiation on land. Insects have some distinctive characteristics that set them apart from other arthropods. These include (Kristensen, 1991): lack of musculature beyond the first segment of antenna. It is of the importance in temperate countries, but is of considerable economic importance in tropical and sub-tropical parts of the world. Class Insecta: Introduction. SHOW MORE a The insect tagmata consist of the cephalothorax and abdomen. The name Arachnida is derived from the Greek aráchnē with ties to a myth.In Greek mythology, Aráchnē was a woman who was turned into a … Blattodea Cockroaches 2. Ø Characters explained for sub-phylum Hexapoa is common for classes of Insecta. Very species rich 2. For each of the following characteristics, indicate whether the trait is common to Phylum Arthropoda or specific to certain classes of arthropods: wings, chewing mouthparts, jointed These are tracheated arthropods. Johnston's organ in pedicel (second segment) of antenna. The phylum Arthropoda is the most diverse of all the animal phyla, and the class Insecta is the most diverse group of arthropods. •Hind wings large, membranous, folded beneath the elytra. The number of described insects is around 700,000 species and an estimate of the known and unknown species together is around 10,000,000. the world. Super-phylum: Ecdysosoa Subphylum UNIRAMIA: Insects, Centipedes, Millipedes. For example, a flowers success depends on the pollenation by bees. The class Arachnida includes a diverse group of arthropods: spiders, scorpions, ticks, mites, harvestmen, and their cousins. 1.1. In head a pair of antenna and a pair of compound eyes are usually present. Distribution 1.
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