692. ONTOGENIES OF FOUR UPPER CAMBRIAN TRILOBITES FROM THE BONNETERRE DOLOMITE, MISSOURI

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Abstract

As one of the series of papers dealing with the ontogenic changes of various Trilobita the present study clarified the ontogenic development of four Upper Cambrian species from the Bonneterre Dolomite in Missouri, i. e., Coosella prolifera, Holcacephalus tenurus, Welleraspis missouriensis and Meteoraspis globosa. Among these four species, Coosella prolifera was investigated in great detail to distinguish the metaprotaspid, paraprotaspid, early meraspid and late meraspid stages. Moreover, two different morphologic groups were clearly shown in the Coosella prolifera and Holcacephalus tenurus samples respectively throughout the ontogenic changes. These bimodal phenomena were supposed to implicate a sexual dimorphism of the trilobites.

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Details 詳細情報について

  • CRID
    1390001205433241856
  • NII Article ID
    110002703084
  • NII Book ID
    AA00867896
  • DOI
    10.14825/prpsj1951.1978.111_348
  • ISSN
    21860963
    00310204
  • Text Lang
    en
  • Data Source
    • JaLC
    • CiNii Articles
  • Abstract License Flag
    Disallowed

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