Comparative Morphology of the Stolonic Vessel in a Didemnid Ascidian and Some Related Tissues in Colonial Ascidians(Morphology)
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概要
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The stolonic vessel is a tubular projection of the epidermis from the anterior part of the abdomen in the didemnid ascidians, and the vessel has been supposed to be closely related to the stolons, vascular appendages, and the posterior ends of the abdomen in other aplousobranch ascidians. We compared the morphology of the stolonic vessels of Diplosoma virens with similar or related tissue in other colonial ascidians, E.g. stolons of Clavelina, vascular appendages of Distaplia and Eudistoma, tunic vesicle of Aplidium, and vascular ampullae of Botrylloides. The epidermis of the stolonic vessel is composed of cuboidal cells in lateral wall and columnar cells at the distal tip of the vessel. The cuboidal cells have microvilli that probably anchor the stolonic vessel to the tunic. The columnar cells contain round granules that may concern with the secretion of some tunic components. The secretion of the granules, however, could not observed in this study. The stolonic vessel of D. virens is similar in morphology to the vascular ampullae of Botrylloides and the tunic vesicle of Aplidium rather than the other tissue examined hire. Since the cell morphology is supposed to reflect its function but not the phylogenetic relationship, the present study could not provide conclusive evidences to prove the homology and the phylogenetic relationship among the tubular, epidermal projections in the colonial ascidians.
- 社団法人日本動物学会の論文
- 2004-04-25
著者
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Hirose Euichi
Department Of Biology Keio University:(present Office)biological Laboratory College Of Agriculture A
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Akahori Marie
Department of Chemistry, Biology and Marine Science, Faculty of Science, University of the Ryukyus
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Akahori Marie
Department Of Chemistry Biology And Marine Science Faculty Of Science University Of The Ryukyus
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