What anatomical features distinguish Class Arachnida from Class Insecta?
Answer
Lack of antennae and wings, and having four pairs of walking legs
The classification into Class Arachnida is marked by several specific anatomical deviations when compared to the Class Insecta. Key distinctions include the number of legs; arachnids universally possess four pairs of walking legs, totaling eight legs, whereas insects possess three pairs (six legs). Furthermore, arachnids are characterized by the absence of antennae and wings, features commonly found in insects. Arachnids also exhibit a body division into only two primary sections—the cephalothorax and the abdomen—unlike the three sections typical of insects.
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