Size regulation of regenerated organs in the compound ascidian, Polyandrocarpa misakiensis



Fragments of zooids of the compound ascidian, Polyandrocarpa misakiensis, have the capacity for morphallactic regeneration. In untreated fragments of zooids, the sizes of regenerated organs were in proportion to the total sizes of the fragments. If two anterior fragments were fused together at their cut surfaces, double-zooid monsters were produced, each regenerating the posterior part at the fusion area. Monsters, resulting from the fusion of two anterior fragments of different sizes, regenerated two digestive loops that were similar in size.