کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10122043 | 1642589 | 2005 | 14 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Diversity of large woody lignophytes preceding the extinction of Archaeopteris: New data from the middle Tournaisian of Thuringia (Germany)
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موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
فسیل شناسی
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![عکس صفحه اول مقاله: Diversity of large woody lignophytes preceding the extinction of Archaeopteris: New data from the middle Tournaisian of Thuringia (Germany) Diversity of large woody lignophytes preceding the extinction of Archaeopteris: New data from the middle Tournaisian of Thuringia (Germany)](/preview/png/10122043.png)
چکیده انگلیسی
Anatomically preserved axes representing three lignophyte species occur in the middle Tournaisian deposit of Kahlleite in Thuringia. One is characterized by a small oval eustele, short uniseriate rays, and alternate distichous phyllotaxy. It is assigned to the progymnosperm genus Protopitys. The two others share a eustelic primary vascular system comprising a parenchymatous pith and numerous xylem strands in a peripheral position. The secondary xylem comprises rays that are mostly uniseriate and rarely exceed 20 cells in height. One is referred to as Eristophyton sp.; the second, characterized by ray cells showing a wide range of sizes and shapes is assigned to Aporoxylon primigenium. These records extend the stratigraphical range of Protopitys and Eristophyton down to the middle Tournaisian and confirm their great longevity through most of the Mississippian. They suggest that the diversity of putative arborescent lignophytes co-occurring with Archaeopteris around the D/C boundary but surviving successfully above this limit has been underestimated.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Review of Palaeobotany and Palynology - Volume 137, Issues 1â2, November 2005, Pages 69-82
Journal: Review of Palaeobotany and Palynology - Volume 137, Issues 1â2, November 2005, Pages 69-82
نویسندگان
Anne-Laure Decombeix, Brigitte Meyer-Berthaud, Nick Rowe, Jean Galtier,