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_...violaceus.html Example photo: Share Share this post on Digg Del.icio.us Technorati Twitter Add to your