Within insects, the main evolutionary dividing line is between those that

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The main evolutionary dividing line within insects is between those that undergo metamorphosis and those that do not. Insects that undergo metamorphosis, such as butterflies and beetles, undergo a dramatic change in form and often ecological niche as they progress through their life stages from egg to larva to pupa to adult. In contrast, insects that do not undergo metamorphosis, such as grasshoppers and crickets, generally hatch from eggs into nymphs that resemble miniature adults and undergo a series of molts until they reach their full size and reproductive potential. The presence or absence of wings is not a reliable indicator of evolutionary relationships among insects, as some groups have evolved to lose or reduce their wings over time. Similarly, while the presence of an eggshell is a defining feature of insect eggs, it is not a major factor in the overall evolutionary diversity of the group.

Within Insects, the Main Evolutionary Dividing Line Is Between Those