Upper left specimen
Center top of photo
Several specimens in photos and videos.
One specimen in photo (extreme left)
Found this in a quadrat in San Antonio Bay while conducting a seagrass study.
Ascidiacea (commonly known as the ascidians or sea squirts) is a class in the Tunicata subphylum of sac-like marine invertebrate filter feeders. Ascidians are characterized by a tough outer "tunic" made of the polysaccharide tunicin, as compared to other tunicates which are less rigid.