Musculature
Muscle organ is a special excretory organ that can be found in arthropods, arachnids, and multi-tributaries of arthropods. This is an elongated thread-like tube that opens at the interface between the median and posterior, the tip of which extends into the body cavity. Through this tube, mainly waste urine such as uric acid is absorbed in the body cavity and sent to the digestive tract, so that the waste is not discharged directly to the body.