Fig. 1.

Patellazoles are only found sporadically in the tunicate L. patella. (A) Photograph of L. patella sample L3 at collection site (courtesy of C. M. Ireland, University of Utah). The green color is due to photosynthetic P. didemni. (B) L. patella is a colonial ascidian containing individual zooids (1) surrounding shared cloacal-peribranchial cavities (2) that contain P. didemni (green circles). Zooids filter feed, excreting waste into the cloacal cavities (direction shown with blue arrows). (C) Structure of the patellazoles and sites of L. patella collections, showing locations of patellazole-containing samples.