They are found on land, in the air, and in the sea. Because they lack backbones, they are invertebrates. In fact, most animal species are insects. In fact, there are so many insects that no one knows quite how to count them all — … 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 … Class Insecta Characteristics: What kind of skeleton do they have? 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. 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 For example, a flowers success depends on the pollenation by bees. Johnston's organ in pedicel (second segment) of antenna. The class Arachnida includes a diverse group of arthropods: spiders, scorpions, ticks, mites, harvestmen, and their cousins. An insect's body has three major body parts, including a head, thorax and abdomen. These appendages are all jointed and usually elongate. They exhibit organ system level of organization. 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. Sub-phylum: Hexapoda Most adult insects have the following characteristics: 1. •Front wings (elytra) are hard and serve as covers for the hind wings; meet in a line down the middle of the back. Insects are many times thought to be bad for plants and animals. 471 People Used Insects have ability to fly and can still use legs effectively. Insect scientists (Entomologists) categorize groups of living entities as how they are related through the Theory of Evolution. 5. Characteristics a. Kingdom: Animalia the world. There are more species of insects than species of all other classes of animals combined. These include (Kristensen, 1991): lack of musculature beyond the first segment of antenna. Phylum: Arthropoda ... Insects show a remarkable variety of morphological characteristics, but they are much more homogeneous in tagmatization than are Crustacea. Although the insects numerically dominate the land as a group their predominance fades in the aquatic environment. All Arachnids have multiple legs and look like Insects, the only difference is that Insects have six leg and Arachnids have 8 legs. In many cases this can be true however many species can be beneficial. The insects take in air using tracheae which are a system of tubes placed throughout the body. These are tracheated arthropods. Insects can experience pigment changes from eating certain foods or in some cases they can be manufactured by the insect. Choose from 349 different sets of class insecta flashcards on Quizlet. Insects are a class in the Phylum Arthropoda, so they have all of the characteristics of the Arthropods. Body is divided into three regions 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. 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), @. An adult insect (imago) eventually emerges from within the pupal exoskeleton bearing little or no resemblance to its larval form. 2 pairs of wings (most) except flies (1 pair of wings - Diptera) B. 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 Insects can live on land, in the water or both and are cold-blooded creatures that require the sun to warm them. 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. It would be hard to get through the day without a close encounter with a six-legged species. Here is an alphabetical list of insect orders in current usage with examples of insects types: 1. •Hind wings large, membranous, folded beneath the elytra. 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. Class Insecta is divided into two subclasses, namely, Apterygota and Pterygota. 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 1 : Insecta. Difference between Centipedes and Millipedes. 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. Coleoptera (beetles and weevils) is the largest order in the class Insecta. Usually one pair of antennae and a pair of compound eyes (a few exceptions to these characteristics are found) 1.4. Class Insecta - The insects A Introduction 1. Characteristics. Modern insects are highly adapted to an immense range of habitats throughout the world, from deserts to snowfields, from rainforest to savannah. Insect, (class Insecta or Hexapoda), any member of the largest class of the phylum Arthropoda, which is itself the largest of the animal phyla. Insects are so prolific that added together they outnumber all other life forms combined. The arthropoda characteristics are mentioned below: The body is triploblastic, segmented, and bilaterally symmetrical. Enter your e-mail address. Body is divided into three parts, head, thorax and abdomen - the distinguishing feature of insects: Head has one pair of antennae. Scientists describe more than 100,000 species of arachnids. Coleoptera Beetles 3. 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 … Sub-kingdom: Eumetazoa SHOW MORE a The insect tagmata consist of the cephalothorax and abdomen. Class Insecta Insecta (L. insectus, cut into) are the most diverse and abundant of all groups of arthropods. A body divided into three parts (head, thorax and abdomen) 1.2. The earth is literally crawling and buzzing with insects, otherwise known as members of the class insecta. Insects have a hard protective covering called an exoskeleton. Class Insecta: Introduction. Three pairs of legs 1.3. Subphylum UNIRAMIA: Insects, Centipedes, Millipedes. Blattodea Cockroaches 2. Body is divided into three parts, head, thorax and abdomen - the distinguishing feature of insects: Head has one pair of antennae. Distribution 1. Muliticellular or unicellular? Phylum Arthropoda, Class Insecta The focus is a typical insect, showing all the characteristics of the class. Habitat: Some live on land and some can even live on top of the water. The phylum Arthropoda is the most diverse of all the animal phyla, and the class Insecta is the most diverse group of arthropods. 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 are small animals which have the body divided into three regions, the head, thorax and abdomen. Most Insects have a large number of unique, derived characteristics, although none of these are externally obvious in most species. The body is divided into head, thorax, and abdomen. 3 main tagmata. Insects are the only arthropods with wings. 3 pairs of legs b. Class Insecta characteristics 3 pairs of legs, segmented, antennae Subclass Pterygota winged insects 2 Divisions in Insecta? 2. Exoskeleton is covered with sensory organs such as compound eye. Ø Characters explained for sub-phylum Hexapoa is common for classes of Insecta. Short life cycle, numerous egg laying periods. Characters of class Insecta 1. The number of insect species outnumbers all other terrestrial animals and plants together. THE CLASS INSECTA. Super-phylum: Ecdysosoa 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. With so many catalogued insects in the world, it only makes sense for researchers to develop a contained system of orders. In head a pair of antenna and a pair of compound eyes are usually present. And the diversity is astounding. Arachnids are a Class (Arachnida) of joint-legged Invertebrate Animals in the subphylum Chelicerata. 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 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. All insects have four pairs of appendages, one pair on the head and three pairs on the thorax. 1.1. From the minuscule pesky flea to the majestic monarch butterfly, there are … Very species rich 2. 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 that experience this sort of complete change are called "holometabolous." Reproductive capacity is enormous and larval stages grow by molting (ecdysis). Basic Features: Insects are a class in the Phylum Arthropoda, so they have all of the characteristics of the Arthropods. Praying Mantis Lady Bug Metallic Ceiba Bug Organisms: Monarch Butterfly What are two examples of insecta? Arthropods, members of the phylum Arthropoda, are a diverse group of animals including insects, crustaceans, spiders, scorpions and centipedes. Learn class insecta with free interactive flashcards. In North America alone, there are about 8,000 arachnid species. In majority of them larval stage is different from the adult and there is a distinct metamorphosis. Have outer covering known as exoskeleton. However, the members of this phylum, despite their incredible diversity and sheer numbers, share a number of important distinguishing characteristics. •Chewing mouthparts (sometimes located at the tip of a beak). Insects form the larger part of the land animals in Insects have segmented … Thorax (middle bit) has three pairs of … Thorax (middle bit) has three pairs of legs. Characteristics of Insect Class Insecta 1. Class - Insecta. Class Insecta of Phylum Arthropoda has undergone and continues to undergo changes in its classification. All habitats except saltwater - replaced by crustacea there a. Freshwater b. Terrestrial c. … 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 They are largely terrestrial and solitary Animal, gathering only for mating. It is of the importance in temperate countries, but is of considerable economic importance in tropical and sub-tropical parts of the world.