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頁籤選單縮合
題名 | Ontogenies of Two Middle Cambrian Trilobites from the Great Basin of the Western Uniteds States=美國西部大盆地地方產中部寒武紀二種三葉蟲的個體發生 |
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作者姓名(中文) | 胡忠恆; | 書刊名 | Journal of Taiwan Museum |
卷期 | 51:2 1998.12[民87.12] |
頁次 | 頁107-117 |
分類號 | 359.542 |
關鍵詞 | 寒武紀; 三葉蟲; 發生史; Cambrian; Trilobites; Ontogeny; |
語文 | 英文(English) |
中文摘要 | 二種三葉蟲Elrathia kingii及Ehmaniella apolabella的生活史各分為原楯期(Protaspid period)、中年期(Meraspid period)及成年期(Holaspid peroid)。在原循期中則又分為前原楯階(Anaprotaspid stage)、後原楯階(Metaprotaspid stage)及準原循階 (Paraprotaspid stage),而中年期別又分為早中年階(Early meraspid stage)及晚中年階(Late meraspid stage)。這樣的分法為表示三葉蟲的幼蟲在原循期的形態變化非常劇烈,而中年期則比較緩和,至成年期則只有體型的增大而已,並無形態上的變化。 二種三葉蟲的早期形態各皆相似,所以無疑的共同屬於同一個大的分類範圍之內,即:Ptychoparioid群。本報告所使用的標本:Elratia kingii產於美國猶他州,House Range,Antelope Spring;Wheeler Shale,而Ehmaniella apolabella則產於內華達州。詳細地址不明,但二者的地質時代皆屬於中寒武紀之Bathyuriscus-Elrrathina化石帶。 |
英文摘要 | The present report describes the ontogenetic development of 2 species of Middle Cambri-an trilobites from the Great Basin area of the western United States: Elrathia kingii (Meek) aiidEhmaniella apolabella, n. sp. The ontogenetic characteristics of these 2 species are definitely those of ptychoparioids and belong to the same taxonomic group. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。