Evidence for a clade composed of molluscs with serially repeated structures: Monoplacophorans are related to chitons

• Gonzalo Giribet

  *Department of Organismic and Evolutionary Biology and Museum of Comparative Zoology, Harvard University, 16 Divinity Avenue, BioLabs 1119, Cambridge, MA 02138;

• Akiko Okusu

  *Department of Organismic and Evolutionary Biology and Museum of Comparative Zoology, Harvard University, 16 Divinity Avenue, BioLabs 1119, Cambridge, MA 02138;

• Annie R. Lindgren

  Department of Biology, New Mexico State University, P.O. Box 30001, Las Cruces, NM 88003; and

• Stephanie W. Huff

  *Department of Organismic and Evolutionary Biology and Museum of Comparative Zoology, Harvard University, 16 Divinity Avenue, BioLabs 1119, Cambridge, MA 02138;

• Michael Schrödl

  Zoologische Staatssammlung München, Münchhausenstrasse 21, 81247 München, Germany

• Michele K. Nishiguchi

  Department of Biology, New Mexico State University, P.O. Box 30001, Las Cruces, NM 88003; and

抄録

Monoplacophorans are among the rarest members of the phylum Mollusca. Previously only known from fossils since the Cambrian, the first living monoplacophoran was discovered during the famous second Galathea deep-sea expedition. The anatomy of these molluscs shocked the zoological community for presenting serially repeated gills, nephridia, and eight sets of dorsoventral pedal retractor muscles. Seriality of organs in supposedly independent molluscan lineages, i.e., in chitons and the deep-sea living fossil monoplacophorans, was assumed to be a relict of ancestral molluscan segmentation and was commonly accepted to support a direct relationship with annelids. We were able to obtain one specimen of a monoplacophoran Antarctic deep-sea species for molecular study. The first molecular data on monoplacophorans, analyzed together with the largest data set of molluscs ever assembled, clearly illustrate that monoplacophorans and chitons form a clade. This “Serialia” concept may revolutionize molluscan systematics and may have important implications for metazoan evolution as it allows for new interpretations for primitive segmentation in molluscs.

収録刊行物

• Proceedings of the National Academy of Sciences

  Proceedings of the National Academy of Sciences 103 (20), 7723-7728, 2006-05-16

  Proceedings of the National Academy of Sciences

キーワード

• Multidisciplinary

詳細情報

• CRID: 1362544421343796864
• NII論文ID: 80019161983
• DOI: 10.1073/pnas.0602578103
• ISSN: 10916490
• ISSN: 00278424
• Web Site: https://pnas.org/doi/pdf/10.1073/pnas.0602578103
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