Respuesta :
Because it lacks certain essential insect features, a spider is not classified as an insect (three body regions, six legs, antennae, compound eyes, etc).
What are beetles?
Beetles are insects that belong to the superorder Endopterygota's Coleoptera order. They can be distinguished from most other insects by the fact that their front pair of wings have solidified into wing-cases, or elytra.
Briefing:
Both share all five features that define arthropods: segmented bodies with different body sections, jointed appendages, exoskeletons, growth through molting, and open circulatory systems.
- A spider only has two different body regions, compared to a beetle's three (head, thorax, and abdomen) (cephalothorax and abdomen)
- A spider has four pairs of legs, compared to a beetle's three pairs (for a total of six legs) (eight legs)
- A spider lacks wings, whereas a beetle has one pair of antennae.
- A complete metamorphosis takes place in a beetle, but not in a spider.
- A spider breathes with its book lungs in addition to its tracheae and spiracles, just like a beetle does.
- A spider only has simple eyes, whereas a beetle has both simple and compound eyes.
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