2 Introduction Entomology is the study of insects. Entomologists are the people that study insects.Insects have been around for more than 400 million years.Believe it or not, insects total more than half of all animal species on Earth.Insects belong to the Insecta class which is in Hexapoda subphylum.
3 Characteristics of Insects There are almost one million insect species.Some of their characteristics are similar to other arthropods such as:ExoskeletonJointed appendagesSegmented body
4 The Body of an InsectThe body is divided into three parts being the head, thorax, and abdomenMandibles and one pair of antennae on headThree pairs of jointed legsAbdomen is divided into 9 to 11 segmentsOne or two pair of wingsSmall sized and can range from .005 in. to 4 in. lengths
5 Common Insect OrdersInsects are classified into 25 orders based on the characteristics of their number of wings, type of development, and the structure of their mouthparts.Nine very common orders of insects and examples of them are:1. Hemiptera (half wing) 2. Homoptera (like wing)True bugs Aphids, Mealy Bugs, Cicadas3. Isoptera (equal wing) 4. Odonata (toothed)Termites Dragonflies, Damselflies
7 Habitat of InsectsInsects live in all parts of world except in salt water.They have short life spans, but produce many eggs.Insects are small, so they live can live with many species and don’t have to compete with them for food and water.Many insects live on leaves, trees, flowers, or other types of vegetation, and others can live underground.
8 Insect’s Diet Insects eat many different things such as: Plants FlowersDecaying organismsSapNectarHuman food crumbsLice
9 Insect Development - Metamorphosis Most insects go through either incomplete or complete metamorphosis that changes their form into adult insects.Incomplete metamorphosis is when a nymph hatches from an egg, and then an adult insect slowly develops.Some of these types of insects are termites, dragonflies, and grasshoppers.Complete metamorphosis happens when an insect goes through two stages of development between the egg and the adult. Caterpillars and larvas can be part of this process.Some of these types of insects are moths, beetles, butterflies, and mosquitos.
10 How Insects Affect People Insects can have negative effects on humans such as:Eating human’s cropsSpreading disease by biting humansTransmitting bacteria that can cause plagueTermites eating the wood of buildingsInsects can also have important positive effects on humans:Being food for birds, fish, and other animalsPollinating plantsMaking honey, silk, wax, and nectarRecycling nutrients from things such as wood and animal carcasses
11 Insect Defense Mechanisms One of an insect’s best defense mechanisms is its ability to fly because it can get away from predators easily.Insects are able to camouflage themselves.Harmless or harmful insects also are able to mimic other harmful insects to blend in with their coloration for defense.Stingers or spraying steam are another way an insect defends itself.
12 How Insects Communicate Insects use their five senses to communicate.They communicate about such things as mating, food, defense, warning, location, and deception.Insects can communicate with other insects by:Sound (Calls or chirps are used by males ready to mate)Light (Flashes of light are shown to find mates too)Pheromones (Insects can emit a chemical which allows another insect to communicate by smelling or tasting it)
13 Diseases that Affect Insects It is most common for insects to carry diseases that affect humans, but disease could also kill off a whole species of insects.A major killer of insects is insecticides that humans use to kill insects even when some of the insects do positive things for the environment.Things in the environment such as water, wind, and pollution can also affect insects survival.
14 ConclusionI learned about the different types of insects, their habitats, insect development, metamorphosis, and the role that insects play in the environment.I was surprised to learn that there are almost one million different types of insects.This information is beneficial because it allowed me to learn why insects are an important species and how they benefit humans through their life cycle and things such as nectar production.I also now understand why it is important for entomologists to study new species of insects and their affect on the changing environment.
15 Resources CitedJones, Owen. "How to Kill Insects the Natural Way." Ezine Articles. SparkNET, 04 July Web. 13 Jan <http://ezinearticles.com/?How-to-Kill-Insects-the- Natural-Way&id= >. Meyer, John R. "Insect Communication." General Entomology. NC State University, Web. 13 Jan <http://www.cals.ncsu.edu/course/ent425/tutorial/Communication/index.html>. Postlethwait, John H., and Janet L. Hopson. "Insects." Modern Biology. Austin, TX: Holt, Rinehart and Winston, Print. "What Do Insects Eat?" What Do Insects Eat? Whyzz. Publications LLC, Web. 13 Jan <http://whyzz.com/what-do-insects-eat>.