Piece of cloth, or animal?

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Possibly a juvenile/new growth of Tiger Sponge (Botrylliodes sp)?

Quote wikipedia:

The "Chain Sea Squirts or Chain Tunicates" of the genus Botrylloides:
Morphologically similar to Botryllus schlosseri and similarly widespread, Botrylloides is distinguished by having linearly-arranged, parallel "chains" of zooids as opposed to zooids like white or yellow stripes emanating from a common center in Botrylloides.[2]
Like Botryllus, Botrylloides are flat sheets of organisms which can be found covering ropes, boat hulls, horseshoe crabs, seaweeds, and any still or slow-moving object in saltwater. Also both are relative invasive Ascidians, found in many ports around the world. Invasive tunicates such as these, Didemnum sp., and Styela clava are a problem for shellfish and other marine life populations, and cause fouling of boats and piers.

Other references:

http://www.exoticsguide.org/species_pages/b_violaceus.html

Example photo:

Tunicate_colony_Nick_Hobgood.jpg
 
https://www.shearwater.com/products/perdix-ai/

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