Tunicate <I>Botryllus planus</I> (IMAGE) Smithsonian Caption This is the tunicate Botryllus planus. Colonial tunicates like this one are made of hundreds of tiny zooids that act as a single organism. The Smithsonian Environmental Research Center has created an online public database to provide key information about the non-native marine species throughout the nation. Credit Rosana Rocha, Universidade de Federal de Paraná, Brazil Usage Restrictions Please include the photo credit when using the image. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.