Insects are invertebrates and belong to the largest group within the arthropod phylum. The word "insect" comes from the Latin word insectum, meaning "with a notched or divided body", or literally "cut into", from the neuter singular perfect passive participle of insectare because insects appear "cut into" three sections.
They found in everywhere in the world from the oceans to polar ice caps and mighty mountains to hot volcanic springs. Their outer body shell is called exoskeleton which is made up chitin and body is categorised into three segment- head, thorax, and abdomen. They have pair of antennae on the top their head.
Importance of insect in the Environment
1. Ecological importance: They perform many important functions like pollination, act as decomposer etc.
2. Economic importance: They produce useful substances like honey, wax, lacquer, and silk.
3. Important part of food web: It is used as food by amphibians, reptiles, birds, and mammals; sometimes by human.
4. Medicinal importance: Some of the insects are used for the medicinal purposes. For example- Gangrene.
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Biggest Insects in the World
The top 10 list of biggest insects in the world are given on the basis of their body size.
10. Goliath Beetle
Scientific name: Goliathus
Size: 60–110 millimetres (2.4–4.3 in)
Found in: Africa
9. Giant Water Bug
Scientific name: Lethocerus americanus
Size: 2-12 cm (0.8 in to 4.5 in)
Found in: Asia
8. Tarantula Hawk
Scientific name: Pompilidae
Size: 5 cm (2 in)
Found in: Southeast Asia, Africa, Europe, Australia, and the Americas.
7. Acteon Beetle
Scientific name: Megasoma actaeon
Size: 5–12 centimetres (2.0–4.7 in)
Found in: South America, particularly in Bolivia, Brazil, Colombia, Ecuador, French Guiana, Guyana, Panama, Peru, Suriname, and Venezuela
6. Queen Alexandra's Birdwing
Scientific name: Ornithoptera alexandrae
Size: 8 cm (3.1 in)
Found in: Coastal rainforest near Popondetta, Oro Province, Papua New Guinea
5. Giant Burrowing Cockroach
Scientific name: Macropanesthia rhinoceros
Size: 8 cm (3.1 in)
Found in: America, Australia
4. Giant Weta
Scientific name: Deinacrida
Size: 10 cm (4 in)
Found in: New Zealand
3. Titan Beetle
Scientific name: Titanus giganteus
Size: 16.7 cm (6.6 in)
Found in: Rain forests of Venezuela, Colombia, Ecuador, Peru, the Guianas, and north-central Brazil.
2. Atlas moth
Scientific name: Attacus atlas
Size: 25–30 cm (9.8–11.8 in)
Found in: South Asia, East Asia, and Southeast Asia, including Borneo
1. Giant Stick Insects
Scientific name: Extatosoma tiaratum
Size: 20 cm (5 to 8 inches)
Found in: Queensland and New South Wales (Australia), New Guinea
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Top 10 Biggest Insects in the World
| Name of Biggest insect (Decreasing order) | Description |
| 1. Giant Stick Insects | Scientific name: Extatosoma tiaratum Size: 20 cm (5 to 8 inches) Found in: Queensland and New South Wales (Australia), New Guinea |
| 2. Atlas moth | Scientific name: Attacus atlas Size: 25–30 cm (9.8–11.8 in) Found in: South Asia, East Asia, and Southeast Asia, including Borneo |
| 3. Titan Beetle | Scientific name: Titanus giganteus Size: 16.7 cm (6.6 in) Found in: Rain forests of Venezuela, Colombia, Ecuador, Peru, the Guianas, and north-central Brazil. |
| 4. Giant Weta | Scientific name: Deinacrida Size: 10 cm (4 in) Found in: New Zealand |
| 5. Giant Burrowing Cockroach | Scientific name: Macropanesthia rhinoceros Size: 8 cm (3.1 in) Found in: America, Australia |
| 6. Queen Alexandra's Birdwing | Scientific name: Ornithoptera alexandrae Size: 8 cm (3.1 in) Found in: Coastal rainforest near Popondetta, Oro Province, Papua New Guinea |
| 7. Acteon Beetle | Scientific name: Megasoma actaeon Size: 5–12 centimetres (2.0–4.7 in) Found in: South America, particularly in Bolivia, Brazil, Colombia, Ecuador, French Guiana, Guyana, Panama, Peru, Suriname, and Venezuela |
| 8. Tarantula Hawk | Scientific name: Pompilidae Size: 5 cm (2 in) Found in: Southeast Asia, Africa, Europe, Australia, and the Americas. |
| 9. Giant Water Bug | Scientific name: Lethocerus americanus Size: 2-12 cm (0.8 in to 4.5 in) Found in: Asia |
| 10. Goliath Beetle | Scientific name: Goliathus Size: 60–110 millimetres (2.4–4.3 in) Found in: Africa |
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