Polyandrocarpa zorritensis (Van Name, 1931)
This species is a social ascidian, with closely packed, individual zooids connected basally by stolons. Together, these zooids form a dense colony that can reach 15 cm in diameter. Individual zooids are subcylindrical in shape and measure 1-2 cm in height. The oral and atrial siphons are positioned anteriorly; each aperture is composed of four lobes, with two black bands per lobe. Zooids are pale brown or yellow-green in color; tunic is thin and leathery. See Brunetti & Mastrototaro, 2004 for more detailed description.
Polyandrocarpa zorritensis has been introduced to the Northeast Pacific, with confirmed records in southern California. In addition, this species has been reported from several other locations around the world, including parts of the Caribbean, Europe, the Mediterranean, and Japan. Its native geographical range likely includes the Eastern Pacific; the species was initially described from Peru (Van Name, 1931).