An Ascidian colony, possibly Botrylloides violaceus.
Although native to this side of the Atlantic they are considered invasive in American waters.
County Clare, Ireland.

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It may surprise you to learn that ascidians or sea squirts (Tunicata) such as these are chordate animals, like humans.

In their early life stages they have larva with tails, the beginnings of a backbone, and gills - which are then reabsorbed/lost when they anchor their heads to a surface!

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