Image PC_PB_MA001. Tunicate colonies of Didemnum vexillum encrusting rocky surface; associated with algae. Pavilion Beach, MA (42 deg 36.50 min N lat, 70 deg 40.133 min W lon. Water depth 3-4 m. June 12, 2012. Identified by P. Colarusso (USEPA). Photo credit: P. Colarusso (USEPA). Map location no. 105. Click here to download image.