Do tardigrades have internal organs?

Ben Waggoner, PhD in Integrative Biology, teaches Invertebrate Zoology, loves tardigrades Answered Dec 11, 2015 · Author has 1.6k answers and 7.7m answer views Yes. read more

The muscular system is composed of numerous muscle bands, each a single muscle cell, extending from one subcuticular point of attachment to another. A single, saccular gonad occupies the coelom. Other internal organs are suspended in a general hemocoel. Tardigrades possess eight legs with ventral orientation. read more

No respiratory organs are found, with gas exchange able to occur across the entirety of the body. Some tardigrades have three tubular glands associated with the rectum; these may be excretory organs similar to the Malpighian tubules of arthropods, although the details remain unclear. Also nephridia are absent. read more