What feature distinguishes the Class Arachnida from insects within Arthropoda?
Answer
Two main body segments and eight legs, lacking antennae or wings
The classification into Class Arachnida is defined by specific morphological characteristics that separate spiders, scorpions, mites, and ticks from other arthropods like insects. The critical defining features are the division of the body structure into precisely two main segments—the cephalothorax, also known as the prosoma, and the abdomen, also known as the opisthosoma. Furthermore, arachnids possess eight legs, a defining characteristic absent in insects which possess six. Insects, conversely, typically have antennae and wings, structures that are characteristically missing in all true arachnids, including the Zebra Tarantula.
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