What are the characteristics of class Insecta?
Insect, any member of the class Insecta, the largest class of phylum Arthropoda. Insects have segmented bodies, jointed legs, and exoskeletons. They are distinguished from other arthropods by their body, which has three major regions: the head, the three-segmented thorax, and the many-segmented abdomen.
Do all Arthropods belong to the class Insecta?
What class do arthropods belong to? Overview of Arthropod Classification What belongs to the class Insecta? Class insecta encompasses all insects, and is included in phylum arthropoda. Insects have three main body segments: the head, thorax and abdomen. They have six legs, one or two pairs of wings and specialized mouth parts.
How to classify insects?
- relatively large insects with long bodies
- 2 pair of similarly sized wings that are transparent and veined
- large heads and large compound eyes
- very small antennae
- life cycle – incomplete metamorphosis (egg, nymph, adult)
- adults eat smaller insects
Do all Arthropoda belong to class Insecta?
Arthropoda is the largest phylum with about nine lakh species. They may be aquatic, terrestrial or even parasitic. They have jointed appendages and a chitinous exoskeleton. This phylum includes several large classes and contains the class Insecta which itself represents a major portion of the animal species in the world.
What are the 4 characteristics of Class Insecta?
Characteristics of Insect Class InsectaThese are tracheated arthropods.It possesses 3 pairs of jointed legs.Body is segmented.Insect body is divided into 3 regions viz., head, thorax and abdomen.It possesses a pair of compound eyes & antennae.Two pairs of wings are present in adult stage.
What organisms are in the class Insecta?
Class InsectaAnoplura – Sucking Lice.Coleoptera – Beetles.Dermaptera – Earwigs.Dictyoptera – Mantids and Cockroaches.Diptera – Flies.Embiidina – Webspinners.Ephemeroptera – Mayflies.Hymenoptera – Ants, Bees, Wasps and Sawflies.More items...
How do you identify the class Insecta?
Class Insecta - InsectsThree pairs of legs.Three body parts: head, thorax, and abdomen.typically two pair of wings; some groups have one pair or none.One pair of antennae.Usually one pair of compound eyes; simple eyes (ocelli) present in many groups.See Glossary for terminology.
What defines Insecta?
1 : any of a group of small and often winged animals that are arthropods having six jointed legs and a body formed of a head, thorax, and abdomen Flies, bees, and lice are true insects. 2 : an animal (as a spider or a centipede) similar to the true insects.
What are 5 characteristics of Insecta?
Characteristics of Insects Insects have jointed appendages as arthropods (arthropod means "jointed foot"), an exoskeleton (hard, external cover), segmented body, ventral nervous system, digestive system, open circulatory system, and advanced sensory receptors.
What is the characteristics of Insecta?
Insects have a chitinous exoskeleton, a three-part body (head, thorax and abdomen), three pairs of jointed legs, compound eyes and one pair of antennae. Their blood is not totally contained in vessels; some circulates in an open cavity known as the haemocoel.
What is the example of Insecta?
BeetlesBeesLadybugsMosquitoesFlyAntsInsects/Lower classifications
What are 4 orders of insects?
A guide to insect ordersDiptera. - All flies, including syrphids. Insects in the order Diptera have only one pair of wings (2 wings total). ... Neuroptera. - Lacewings and ant lions. ... Coleoptera. - All beetles including lady beetles, leaf beetles, soldier beetles. ... Lepidoptera. - Butterflies and moths. ... Dermaptera. - Earwigs.
Why is classification of insect important?
Being able to identify the insects you see around your home or garden helps you to know if the insect is dangerous, an urban or agricultural pest, or beneficial.
What are the 7 orders of insects?
Below is a short guide to the identification of the eight major orders.Beetles Coleoptera (“sheath wings”)Moths, Butterflies Lepidoptera (“scaly wings”)Bees, Wasps, Ants Hymenoptera (“membrane-‐winged”)Flies, Mosquitoes, Gnats Diptera (“two wings”)Crickets, Grasshoppers, Locusts Orthoptera (“straight wings”)
How many orders are there in class Insecta?
The class Insecta is divided in to 29 orders.
How many types of insects are there?
In the world, some 900 thousand different kinds of living insects are known. This representation approximates 80 percent of the world's species. The true figure of living species of insects can only be estimated from present and past studies.
What are insects examples?
BeetlesBeesLadybugsMosquitoesFlyAntsInsects/Lower classifications
How many species of insects are there?
It has long been recognized and documented that insects are the most diverse group of organisms, meaning that the numbers of species of insects are more than any other group. In the world, some 900 thousand different kinds of living insects are known. This representation approximates 80 percent of the world's species.
What is Insecta class or order?
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 have segmented bodies, jointed legs, and external skeletons (exoskeletons).
How many orders are there in class Insecta?
The class Insecta is divided in to 29 orders.
What are three characteristics of insects?
Insects have a variety of characteristics that distinguish them from other arthropods. Three characteristics of insects include that they have thre...
What is the class Insecta?
The class Insecta is a class of the Phylum Arthropoda. Insects are classified distinctly by the body structure, location and number of eyes, locati...
What is unique about the class Insecta?
The class Insecta is unique because of the organisms' exoskeletons, number and location of legs, and body segments (head, thorax, and abdomen). The...
What are the structures of the insect endocrine system?
Neurosecretory, neurohemal, and endocrine structures are all found in the insect endocrine system. There are several neurosecretory centres in the brain, the largest being the pars intercerebralis. The paired corpora cardiaca (singular, corpus cardiacum) and the paired corpora allata (singular, corpus allatum) are both neurohemal organs that store brain neurohormones, but each has some endocrine cells as well. The ventral nerve cord and associated ganglia also contain neurosecretory cells and have their own neurohemal organs; i.e., the multiple perisympathetic organs located along the ventral nerve cord. The insect endocrine system produces neurohormones as well as hormones that control molting, diapause, reproduction, osmoregulation, metabolism, and muscle contraction.
How do insects enter diapause?
Diapause is characterized by cessation of development or reproduction, decrease in water content (dehydration), and reduction in metabolic activities. It usually is preceded by an accumulation of nutrients resulting in hypertrophy of the fat bodies. Environmental factors (such as temperature, photoperiod, and food availability) cause storage of neurohormones, and the corpora allata become inactive. Termination of diapause can be brought about by reversing the environmental conditions that induced the diapause. Although juvenile hormone can terminate diapause, it triggers diapause in some insects. The stage of the life history may be important in determining the role of JH. For example, in imaginal diapause (characterized by cessation of reproduction in the imago, or adult), the absence of JH initiates diapause. In lepidopterans, a peptide that initiates diapause has been isolated from the subesophageal ganglion.
Do insects have diuretic hormones?
Osmoregulation. All insects produce a diuretic hormone and many produce an antidiuretic hormone as well. Insects feeding exclusively on a liquid diet (such as plant sap or blood) have only the diuretic hormone that allows them to eliminate excess fluid and salts through the malpighian tubules (the insect kidney).
What are the four stages of an insect's life cycle?
2- Holometabolous insects have a four-stage life cycle: egg, larva, pupa, and adult (imago). The following orders of insects are holometabolous: They form a group referred to as Endopterygota or Holometabola.
What is the name of the group of insects that have lost their wings?
They form a group referred to as Endopterygota or Holometabola. Remarks. All the winged insects (including those who have lost their wings over the course of history) constitute a large taxon called Pterygota (sometimes treated as a subclass).
What is the term for a nymph that goes through a series of molts?
1- Hemimetabolous insects (e.g., dragonflies, mayflies, true bugs, grasshoppers) undergo gradual, or incomplete, metamorphosis. Immature stages (usually called nymphs) go through a series of molts, gradually assuming an adult form. Since the wings develop on the outside of the body, these groups are called exopterygotes.
How many species of insects are there?
There are more species of insects than species of all other classes of animals combined. The number of insect species has been estimated at up to 10 million. There is also striking evidence of continuing evolution among insects at the present time, even though the fossil record indicates that the group as a whole is stable.
Where do insects live?
Insects are among the most abundant and widespread of all land animals. They have spread into practically all habitats that will support life except most of the sea. Relatively few are marine. Marine water striders ( Halobates ), which live on the surface of the ocean, are the only marine invertebrates that live on the sea-air interface. Insects are common in brackish water, in salt marshes, and on sandy beaches. They are abundant in fresh water, in soil, in forests (especially the tropical forest canopy), and in plants, and they are found even in deserts and wastelands, on mountaintops, and as parasites in and on plants and animals.
How do insects control their wings?
Indirect flight muscles are not attached to the wing and cause wing movement by altering the shape of the thorax. The wing is hinged at the thoracic tergum and also slightly laterally on a pleural process, which acts as a fulcrum (Figure 20-12). In all insects, the upstroke of the wing is effected by contracting indirect muscles that pull the tergum down toward the sternum (Figure 20-12A). Dragonflies and cockroaches accomplish the downstroke by contracting direct muscles attached to the wings lateral to the pleural fulcrum. In Hymenoptera and Diptera all flight muscles are indirect. The downstroke occurs when the sternotergal muscles relax and longitudinal muscles of the thorax arch the tergum (Figure 20-12B), pulling up the tergal articulations relative to the pleura. The downstroke in beetles and grasshoppers involves both direct and indirect muscles.
What is the exoskeleton of an arthropod?
As in other arthropods, the exoskeleton is made up of a complex system of plates known as sclerites , connected by concealed, flexible hinge joints. Muscles between sclerites enable insects to make precise movements. Rigidity of their exoskeleton is attributable to the unique scleroproteins and not to its chitin component. Its lightness makes flying possible. By contrast, the cuticle of crustaceans is stiffened mostly by minerals.
What are the three parts of an insect tagmata?
Insect tagmata are head, thorax, and abdomen. The cuticle of each body somite typically is composed of four plates (sclerites), a dorsal notum (tergum), a ventral sternum, and a pair of lateral pleura. Pleura of abdominal segments are membranous rather than sclerotized.
What is the hindleg of a grasshopper?
Hindleg of grasshopper. Muscles that operate the leg are found
How many types of insect mouthparts are there?
Four types of insect mouthparts. (See text for description of types and
What is the classification of insects?
Classification: Classifying involves grouping things into categories based on similar characteristics. Insects, like all living organisms, can be classified according to their phylogenetic relationships.
What is the class of arachnida?
ARACHNIDA. Class Arachnida (uh-rak-nid-uh), spiders, ticks, mites, scorpions and others. This is a diverse class which belongs to a subphylum of the Arthropoda known as the Chelicerata. Chelicerata are characterized as having two distinct body regions, a cephlothorax and an abdomen.
How many species of Crustacea are there?
There are about 30,000 species of Crustacea. Most are aquatic, the majority of which are marine. Crustaceans includes lobsters, crabs, crayfish, shrimp, barnacles, and several less familiar forms. One of the latter is the Isopoda, the sowbugs and pillbugs or roly-polys.
What are the features of all arthropods?
All arthropods posses an exoskeleton, bi-lateral symmetry, jointed appendages, segmented bodies, and specialized appendages . The major arthropod classes can be separated by comparing their number of body regions, legs, and antennae.
How many tagmata are there?
Three tagmata (head, thorax and abdomen) Two pairs of antennae: first pair is greatly reduced , seldom noticed. Seven pairs of legs, one pair on each thoracic segment. Abdomen small, more or less fused. Most isopods are marine, living in seaweed and under stones in the water. There are a few freshwater forms.
What is the scientific name of an organism?
Nomenclature: Nomenclature refers to the naming of organisms. Each organism is given a name consisting of two words referred to as the scientific name. The first word represents the genus and the second the species. Scientific names are Latin and are either printed in italics or underlined if handwritten.
What is the classification system used by scientists?
The classification system used by scientists involves a hierarchy beginning with a broad category and ending with a very specific category. In science, we classify organisms according to kingdom, phylum, class, order, family, genus, and species. Nomenclature: Nomenclature refers to the naming of organisms.
