142. 三葉蟲の新屬<I>Hamashania</I>と<I>Kirkella</I>
書誌事項
- タイトル別名
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- 142. Two New Trilobites Genera, Hamashania and Kirkella
抄録
During my stay in Washington, D. C., as a visiting scholar at the U. S. National Museum, 1931-1934, Dr. Edwin KIRK once showed me a peculiar trilobite, Asaphus (?) curiosus BILLINGS, which is, acording to him, an important horizon-marker in Lower Ordovician formations in North America. As suggested by its name, it is quite different from all of the other trilobites so far known. Lately, however, I have obtained a similar one from an Upper Cambrian formation in the Huanglouhsien area, in Eastern Jehol. While only the pygidium is known of the former species that of the latter is found associated with a cranidium of saukid-type. As other parts of carapace remain unknown of these trilobites, nothing definite can be mentioned of their true phylogenetic relationship. It appears more probable however that such peculiar forms indicate terminal branches of two different evolutional lines rather than that they are mutually related. At any rate the two trilobites are quite different from the others and they can be readily distinguished from each other. Therefore Hamashania is proposed here for the Upper Cambrian one of Eastern Asia and Kirkella for the Lower Ordovician one of North America.
収録刊行物
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- 日本古生物学會報告・紀事
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日本古生物学會報告・紀事 1942 (23), 118-121, 1942
日本古生物学会
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詳細情報 詳細情報について
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- CRID
- 1390001204086227456
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- NII論文ID
- 130004087874
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- ISSN
- 21860955
- 00310204
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- データソース種別
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- JaLC
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可