Blue ascidians (Rhopalaea crassa) from the Philippines.

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Photo credit: © Alf Jacob Nilsen / Alamy / Afripics
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Keywords: ascidia, ascidiacea, blue, chordata, crassa, diazonidae, enterogona, kappedyr, rhopalaea, sea, sekkedyr, sjøpung, sjøpunger, squirt, squirts, tunicata, tunicate, tunicates, urochordata, urochordater, urochordats