AtriolumAtriolum is a genus of colonial tunicates in the order Aplousobranchia, first described in 1983 by Patricia Kott. These are marine animals found attached to the seabed or some other surface.SpeciesThe World Register of Marine Species lists the following species in the genus:Atriolum bucinum Kott, 2001Atriolum eversum Kott, 2001Atriolum glauerti Atriolum lilium Kott, 2001Atriolum marinense Kott, 2001Atriolum marsupialis Monniot, 1989Atriolum quadratum Monniot & Monniot, 1996Atriolum robustum Kott, 1983Atriolum tubiporum Kott, 2001