کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4750915 | 1642567 | 2008 | 17 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Ovule-bearing organs of Ginkgo ginkgoidea (Tralau) comb. nov., and associated leaves from the Middle Jurassic of Scania, South Sweden
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موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
فسیل شناسی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Ovule-bearing organs of Ginkgo ginkgoidea (Tralau) comb. nov., and associated leaves from the Middle Jurassic of Scania, South Sweden Ovule-bearing organs of Ginkgo ginkgoidea (Tralau) comb. nov., and associated leaves from the Middle Jurassic of Scania, South Sweden](/preview/png/4750915.png)
چکیده انگلیسی
Fossil seeds originally described as Allicospermum ginkgoideum from the Middle Jurassic Mariedal Formation of Eriksdal, Scania, Sweden, are re-examined together with several new seeds and ovule-bearing organs discovered from the same locality and horizon. The ovule-bearing organs consist of a peduncle furcating into two (to three?) pedicels, each with a single sessile ovule supported by a cup-shaped collar. Ovules are ovate in outline with an obtusely acute or acute to mucronate apex and a broad base. Based on morphological and structural similarities to Ginkgo biloba, the ovulate organs and corresponding seeds are assigned to the genus Ginkgo, and a new combination, Ginkgo ginkgoidea, is suggested for the Scanian material. This is the first record of well-preserved ovulate organs of Ginkgo from the Jurassic of Europe. Leaves of Ginkgoites regnellii associated with G. ginkgoidea is also restudied in detail. Similarities in cuticular features between G. regnellii and G. ginkgoidea together with their close association strongly suggest that the two organ types were produced by the same plant as originally suggested by Tralau.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Review of Palaeobotany and Palynology - Volume 149, Issues 1â2, March 2008, Pages 1-17
Journal: Review of Palaeobotany and Palynology - Volume 149, Issues 1â2, March 2008, Pages 1-17
نویسندگان
Xiao-Ju Yang, Else Marie Friis, Zhi-Yan Zhou,