Early loop ontogeny of some Recent laqueid brachiopods

この論文にアクセスする

この論文をさがす

著者

抄録

Abstract. The early loop ontogenies of nine Recent laqueid species from Japanese waters were examined using scanning electron microscopy. Although juvenile specimens representing certain early loop stages were not available for some species, all the examined species appear to share roughly the same early stages of loop development as described by Richardson (1975). However, some differences and characteristic features exist in the early stages of loop ontogeny, such as the disposition of the septal flanges and presence or absence of septal bifurcation, characters which appear to be invariable at the genus level. A prime example is the case of the affinity between Laqueus and Frenulina, which have occasionally been included in the same subfamily. Inspections of loop morphology of early growth stages, especially of the above characters, indicate that these two genera may not be as closely related as previously thought. Comparison of relative timing of loop development as standardized by shell length reveals some variation within a species, but no major variation among species. Heterochrony is evident in one laqueid species, 'Frenulina' sp., in which adult individuals have a loop of juvenile morphology in other species.

収録刊行物

  • Transactions and proceedings of the Palaeontological Society of Japan. New series = 日本古生物学会報告・紀事. 新篇

    Transactions and proceedings of the Palaeontological Society of Japan. New series = 日本古生物学会報告・紀事. 新篇 (183), 485-499, 1996-09-30

    日本古生物学会

参考文献:  15件中 1-15件 を表示

被引用文献:  2件中 1-2件 を表示

各種コード

  • NII論文ID(NAID)
    110002703423
  • NII書誌ID(NCID)
    AA00867896
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    00310204
  • NDL 記事登録ID
    4076577
  • NDL 雑誌分類
    ZM49(科学技術--地球科学--地質)
  • NDL 請求記号
    Z15-283
  • データ提供元
    CJP書誌  CJP引用  NDL  NII-ELS  J-STAGE 
ページトップへ