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Respiratory adaptations-terrestrial and aquatic arthropods

Which respiratory adaptations or organs do terrestrial and aquatic arthropods respectively present?

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In the crustaceans, characteristic aquatic beings, there are richly vascularized gills which create contact with water and allow gas exchange. In the terrestrial insects respiration is tracheal and gases flow in small tubes which connect animal external surface and ramify to tissues and cells devoid of participation of the blood. In the arachnids, besides tracheal respiration, book lungs (or thin folds resembling leaves in book) might also exist.

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