What type of excretory system does a Diplopoda have?

Diplopoda, commonly known as millipedes, possess a tracheal excretory system that primarily utilizes Malpighian tubules. These tubules extract waste products from the hemolymph and convert them into uric acid, which is then excreted in a semi-solid form, conserving water. This adaptation is particularly beneficial for their terrestrial lifestyle, enabling them to thrive in various environments.