- Researchers have discovered fossils of tunicates that are about 500 million years old.
- This fossil has been named Megasiphon Thylakos. The two main genera of tunicates are the Ascidians and the Appendicularias.
- Tunicates are a genus of marine invertebrates found in the shallow waters of the oceans.
- Two siphons in its body which allow it to feed and excrete water.
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