Molecular phylogeny and morphological evolution of laqueoid brachiopods

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Author(s)

Abstract

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.

Journal

  • Paleontological Research

    Paleontological Research 5(2), 87-100, 2001-06-29

    The Palaeontological Society of Japan (PSJ)

References:  35

Cited by:  1

Codes

  • NII Article ID (NAID)
    110002695256
  • NII NACSIS-CAT ID (NCID)
    AA11137385
  • Text Lang
    ENG
  • Article Type
    Journal Article
  • ISSN
    13428144
  • NDL Article ID
    5908979
  • NDL Source Classification
    ZM49(科学技術--地球科学--地質)
  • NDL Call No.
    Z54-J142
  • Data Source
    CJP  CJPref  NDL  NII-ELS 
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