後期三畳紀二枚貝 Monotis の古生物学的意義 : その 1 研究史 Paleontological significance of late Triassic Bivalve Monotis : Part I A review

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抄録

Of various, very thin-shelled Mesozoic extinct bivalves, which are noticeable for their peculiar morphology and unique mode of fossil occurrence, Late Triassic Monotis is suitable for evolutionary studies at the population level, because of its abundant occurrence in successive sequence. Furthermore, it is paleobiologically interesting animal, because it shows relatively rapid morphological change. In this part previous works are reviewed with some comments from the viewpoints of taxonomy, biostratigraphy, paleobiogeography and paleoecology. There are still many problems about the infrageneric classification and synonymic relation among numerous nominal species. Although Monotis is important for an index fossil of the upper Triassic, its exact range is still not confirmed by such other indices as ammonoids. Zonal divisions need to be reexamined, taking intrapopulational variation into account, by means of population samples. Monotis in Japan does not occur from comparatively off-shore sediments as Hallstadt limestone in Europe, but from near-shore silty to sandy sediments, in general. The distribution of Monotis is world-wide, but we recognize some major realms at the species or species-group level, roughly corresponding with Triassic faunal provinces. Some problems about its mode of life remain unsolved. Although there are still no positive evidences, it is suggested that Monotis was pseudoplanktonic or epibenthic bivalves attached to seaweeds on a sea floor, judging from its morphology and mode of occurrence.

収録刊行物

  • 化石

    化石 33(0), 13-27, 1983

    日本古生物学会

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各種コード

  • NII論文ID(NAID)
    110002703462
  • NII書誌ID(NCID)
    AN00041606
  • 本文言語コード
    JPN
  • 資料種別
    雑誌論文
  • ISSN
    00229202
  • NDL 記事登録ID
    2594191
  • NDL 刊行物分類
    ME71;M011
  • NDL 雑誌分類
    ZR1(科学技術--生物学) // ZM41(科学技術--地球科学)
  • NDL 請求記号
    Z18-838
  • データ提供元
    CJP引用  NDL  NII-ELS  J-STAGE 
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