Evolutionary BiologybioRxiv
Active mode of excretion across digestive tissues predates the origin of excretory organs
C. Andrikou, D. Thiel, J. A. Ruiz-Santiesteban, A. Hejnol
The paper shows that Xenacoelomorpha and Cnidaria excrete toxins across digestive tissues, suggesting this was the ancestral excretory mode before specialized organs evolved.
DOI 10.1371/journal.pbio.3000408