Insect anatomy in depth
Detailed insect anatomy: compound eyes contain many visual units, each with a lens. Spiracles admit air to breathing tubes. Mouthparts include chewing mandibles in leaf-eating beetles, a sipping proboscis in nectar-feeding adult butterflies, and a sponging tip in house flies. Growing insects moult their exoskeleton. Insect structures can inspire human designs.
What a learner can do afterwards
- Describe at least two specialised insect structures such as compound eyes or spiracles and explain their function
- Compare the mouthparts of a beetle (chewing) and a butterfly (sucking) and explain how each is suited to its food
- Give one example of biomimicry where human technology is inspired by an insect structure or ability
1 · Read
You know the insect body plan: head, thorax, abdomen and an exoskeleton. Many insects also have compound eyes. A compound eye contains many small visual units called ommatidia. Each unit has a lens and light-sensitive cells. Units facing different directions collect information from across a broad view. Together they help the insect detect movement.
Insects have no lungs. Air enters small openings called spiracles and travels through branching tubes. Oxygen passes from the tubes to nearby cells. In most insects, blood does not deliver oxygen around the body as human blood does.
A leaf-eating beetle cuts solid food with hard jaws called mandibles. A nectar-feeding adult butterfly draws liquid through a long tube called a proboscis. The tube coils up between meals. A house fly also has a proboscis, but its tip is spongy and takes up liquid food. Different mouthparts suit different foods.
Moulting lets one insect grow during its own life. This is development, not evolutionary adaptation across generations in a population. A hardened exoskeleton limits an insect's growth. A new, soft covering forms underneath. During a moult, the insect sheds its old covering. It then expands while the new covering is soft, before that covering hardens. An insect trapped in its old covering cannot grow normally and may die.
Biomimicry uses ideas from living things in human designs. Researchers have made experimental cameras inspired by compound eyes. Their many small lens units collect light from different directions to give a wide field of view. This camera design borrows a feature of an insect eye.
Compound eyes contain many visual units. Spiracles let air in. Mouthparts suit different foods. Moulting lets a growing insect leave its old covering and expand.
Lesson, questions and flashcards written for this dataset.
2 · Watch
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Where it sits
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Optional connections
Where this leads
Jobs that lean on this skill. Follow one to see everything it is built on.
8 questions wait behind this lesson, each with its answer explained. Every answer feeds the sky: stars light as they are learned, and dim when it is time to come back.