Molecular phylogeny and morphological evolution of laqueoid brachiopods

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概要

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• One of the virtues of molecular phylogeny for paleontology is that it can provide independent and often reliable sets of data from living relatives to test various evolutionary hypotheses inferred from fossil forms. In this study, we present results of a molecular phylogenetic analysis of 12 species of 7 genera belonging to the Laqueoidea, which is the most prolific of the brachiopod superfamilies in the seas around Japan. Onto a phylogenetic tree based on partial sequences (1218 bp) of the mitochondrial cox1 gene, we superimposed various external and internal morphologic characters of both juveniles and adults for the taxa examined. The resulting patterns indicated that several lineages experienced paedomorphic evolution in terms of the brachidial (loop) morphology, and that, contrary to some traditional views, certain adult features, such as the bilateral loop, possession of a cardinal process, and a rectimarginate commissure, had homoplasious distributions. Examination of the character distributions also revealed, however, that anterior nonbifurcation of the septal pillar at the axial phase is a synapomorphy for a major clade recognized in the molecular analysis. Those results suggest that early loop ontogeny, information about which is still fragmentary, would be useful in assessing relationships among laqueoid brachiopods, including certain Mesozoic genera.

• 日本古生物学会の論文
• 2001-06-29

著者

• Endo Kazuyoshi

  Department Of Earth Evolution Sciences Graduate School Of Life And Environmental Sciences University

• Endo Kazuyoshi

  Department Of Earth And Planetary Science University Of Tokyo

• Endo Kazuyoshi

  Department Of Chemistry Faculty Of Science Shinshu University

• SAITO MICHIKO

  JSPS Research Fellow in the Department of Earth and Planetary Science, University of Tokyo

• Saito Michiko

  Jsps Research Fellow In The Department Of Earth And Planetary Science University Of Tokyo

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