Tunicate Didemnum vexillum

What ancient animal in modern times has a primitave spinal cord that may resemble the first vertebrates on earth, spends most of its life stuck to a boat or rock, produces an exoskeleton made of cellulose and is more associated with plants than animals? Tunicates are marine invertebrate filter feeders that colonize underwater substrates and can also be invasive. They can be spread by boats, fishing gear and aquaculture activities.

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