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.