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.
Journal
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- Transactions and proceedings of the Paleontological Society of Japan. New series
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Transactions and proceedings of the Paleontological Society of Japan. New series 1978 (111), 348-357, 1978
PALAEONTOLOGICAL SOCIETY OF JAPAN
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Details 詳細情報について
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- CRID
- 1390001205433241856
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- NII Article ID
- 110002703084
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- NII Book ID
- AA00867896
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- ISSN
- 21860963
- 00310204
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- Text Lang
- en
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- Data Source
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- JaLC
- CiNii Articles
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- Abstract License Flag
- Disallowed