کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4750908 | 1642550 | 2010 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Seed plant diversity in the Triassic of Antarctica: A new anatomically preserved ovule from the Fremouw Formation
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
فسیل شناسی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Seed plant diversity in the Triassic of Antarctica: A new anatomically preserved ovule from the Fremouw Formation Seed plant diversity in the Triassic of Antarctica: A new anatomically preserved ovule from the Fremouw Formation](/preview/png/4750908.png)
چکیده انگلیسی
A new anatomically preserved ovule is described from the Middle Triassic Fremouw Formation of the Beardmore Glacier area, Antarctica. Probolosperma antarcticum gen. et sp. nov. is bilaterally symmetrical and up to 1Â cm long and 6Â mm wide. The integument is characterized by a complex sarcotesta with a palisade-like outer layer and a sclerotesta that forms two small lateral wings and elaborations in the chalazal and apical regions. The vascular system consists of a terete strand that enters the pedicel to form a small cup of tracheids at the base of the nucellus, with two strands that extend distally in the inner part of the sclerotesta. Comparisons with other gymnosperm ovules indicate that Probolosperma represents a new taxon, which enhances the diversity of known seed plants from the Triassic of Antarctica.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Review of Palaeobotany and Palynology - Volume 158, Issues 3â4, January 2010, Pages 272-280
Journal: Review of Palaeobotany and Palynology - Volume 158, Issues 3â4, January 2010, Pages 272-280
نویسندگان
Anne-Laure Decombeix, Sharon D. Klavins, Edith L. Taylor, Thomas N. Taylor,