Definition: Theonellidae is a group of small, slender, and often dark-colored insects in the order Apidae. These insects are commonly found on various surfaces such as stones, bark, or even in the air. They have a short thorax with four pairs of legs (legs 1-4) that are usually arranged in a ciliated pattern, which allows them to move quickly and efficiently through their environment. The term "Theonellidae" refers to these insects,
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