Tunic Cuticular Protrusions in Ascidians (Chordata, Tunicata) : A Perspective of Their Character-State Distribution
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概要
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Fine structure of the ascidian tunic cuticle was surveyed for minute protrusions in 30 species of the suborder Aplousobranchia, 10 species of Phlebobranchia and 23 species of Stolidobranchia (Ascidiacea, Chordfata). The present results, combined with previously published data, describe the fine structure of the tunic cuticle in 116 species of ascidians covering all the families and subfamilies of the calss Ascidiacea except for the phlebobranch families Octacnemidae and Plurellidae. These data confirm the general stability of the character-state distribution (presence or absence) of the tunic cuticular protrusions within families or subfamilies. Cuticular protrusions occur only in Polyclininae and Clavelininae of the order Enterogona (Aplousobranchia and Phlebobranchia) and in all families of the order Pleurogona (Stolidobranchia and Aspiraculata). A few exceptions were the occurrence of cuticular protrusions in Polycitor proliferus (Polycitorinae), Distaplia dubia (Holozoinae), Pterygascidia longa (Cionidae) and Adagnesia vesiculiphora (Agneziidae), and the absence in some styelies and pyurids that have hard tunics. Possible character-state changes in the ascidian phylogenies are discussed briefly.
- 社団法人日本動物学会の論文
著者
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Hirose Euichi
Biological Laboratory College Of Agriculture And Veterinary Medicine Nihon University
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KUSAKABE Takehiro
Division of Biological Sciences, Graduate School of Science, Hokkaido University
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Kusakabe Takehiro
Division Of Biological Sciences Graduate School Of Science Hokkaido University
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Lambert Gretchen
Department of Biological Science, California State University
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Nishikawa Teruaki
Graduate School of Human Informatics, Nagoya University
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Lambert Gretchen
Department Of Biological Science California State University
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Nishikawa Teruaki
Graduate School Of Human Informatics Nagoya University
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Hirose Euichi
Biological Laboratory College Of Bioresource Sciences Nihon University:department Of Chemistry Biolo
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