CHARACTERISTICS OF SOME OF THE ORDERS OF CLASS INSECTA

Learning Objectives
After studying or reading this, you should be able to:
1) Mention the major orders of Class insecta.

2) Describe the characteristics of the major orders of Class Insecta.









ORDER: Odonata
  They have narrow or long bodies with brilliant metallic colours. They have a pair of large compound eyes, long and slender abdomen. Two pairs of equal sized membranous wings are present. They have a pair of small antennae. They undergo incomplete
metamorphosis.
Examples: dragonfly and damselfly.
dragonfly





ORDER: Orthoptera
   They have two pairs of wings, a pair of leathery straight forewings and a pair of hind wings which are membranous and folded under forewings at rest. The hind legs are comparatively enlarged and specialized for jumping and hopping. They have chewing mouth parts. They have stridulatory (sound producing) organs. They undergo incomplete metamorphosis.
Examples include: grasshoppers; crickets; locusts; praying mantis, etc.
grasshopper




ORDER: Coleoptera
    They have large and movable prothorax. Their forewings are hardened to form wing cases called clytree which cover and protect the hind membranous wings. They have chewing mouth parts. They undergo complete metamorphosis.
Examples include: grain weevil; (Sitophilus sp.) Beetles i.e. rhinocerous.
beetles



ORDER: Hymenoptera
     There is presence of narrow waist between the thorax and abdomen. The forewings are larger than hind wings. The forewings are joined to hind wings by a series of hooks. Many are social insects. They undergo complete metamorphosis. They have chewing or sucking mouth parts.
Examples include: ants; bees and wasps.
a bee



ORDER: Hemiptera
    They have piercing and sucking mouth parts modified into a rostrum (beak). Forewings have a hard basal portion and an apical membranous portion. They are either Wingless or have two pairs of wings. They undergo incomplete metamorphosis.
Examples include: water boatman; (Dysdercus fasciatus); cotton stainer; bed bugs; assassin bugs; plant bugs; cocoa capsid, etc.
cotton Stainer



ORDER: Diptera
They have one pair of forewings and a pair of hindwings which are modified into halteres (balancing organs). The mouth parts are elongated to form proboscis. They undergo complete metamorphosis. Examples include: mosquito; tsetsefly; housefly; blowfly; horsefly; gnats; etc.
mosquito



ORDER: lsopteran
    Has two pairs of similar narrow membranous fore and hind wings or Wingless when shed. Abdomen joined broadly to thorax. Presence of biting and chewing mouth parts. Some are social insects. They undergo incomplete metamorphosis.
Examples include: Termites (Macrotermes Bellicosus)
termites



ORDER: Lepidoptera
     The mouth parts are modified as proboscis which is used for sucking. The proboscis are coiled under the head when at rest. The antennae are tapered or knobbed. There are two pairs of membranous wings. The wings are covered with overlapping powdery scales. They undergo complete metamorphosis. Examples include: butterfly; moth etc.
butterfly












Did you understand what you have just read?

To make sure you have understood, ANSWER the  QUESTIONS below:

CHARACTERISTICS OF SOME OF THE ORDERS OF CLASS INSECTA

1. List four orders of the class Insecta and for each give on example.

2. State four characteristics common to all insecta.

3. Place the underlisted insecta into their correct orders and give two reasons for your choice.
i. Butterfly ii. Termite iii. Mosquito iv.Grasshopper

4. Give the orders of the following insecta and give two characteristics of each order.
i. Wasp ii. Grain weevil iii. Dragonfly iv. Cotton stainer

5. Give five reasons why a housefly and rhinoceros beetle are put under the same class.

6. How is a butterfly different from an ant?

7. a. List four characteristics of the order Odonata.

b. State two differences between the cricket and the wasp.

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