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The acorn worm Balanoglossus simodensis reproduces asexually by fragmentation and subsequent regeneration from the body fragments. We examined the morphogenesis of its asexual reproduction. At first, we collected asexually reproducing specimens and observed their morphogenesis. Then, we succeeded in inducing the asexual reproduction artificially by cutting the worm at the end of the genital region. The process of morphogenesis is completely the same between naturally collected and artificially induced specimens. The stages during morphogenesis were established on the basis of the external features of the asexually reproducing fragments. The internal features of the fragments were also examined at each stage. In a separate phase of the study, the capacity for regeneration of some body parts was also examined by dividing intact worms into about 10 fragments. Although the capacity for regeneration varied among the different body parts, some fragments regenerated into complete individuals in 1 month. The process of regeneration was the same as that in the asexually produced fragments. [ABSTRACT FROM AUTHOR]

Focuses on a study which described the morphology and life history of an ascidian found at Noroshi Point in Shimoda, Japan. Observations on morphology; Colony specificity.

Presents information on a study which investigated the morphology and life history of an unidentified botryllid ascidian that was first collected from the stony shore of Shikine Island of the Izu Islands in Japan. Materials; Methodology; Results and discussion.