Antennae shapes vary, and different styles within a particular shape are not uncommon. Here, feathery antennae in the moth Lymantria sp. (left). There are specialised structures called sensilla in the antennae that are responsible for detecting odours. The antennae are the sensors for the insect to monitor its physical and chemical environment.
Long-horned beetle (above) and cricket nymph (left). From a mechanical point of view , insect antennae are like cantilever beams. A longer antenna, such as those seen in the long-horned beetles, in cockroaches or in field crickets, must sag if they are cantilever beams; but they do not. Long-horned beetle.
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