کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10122029 | 1642588 | 2005 | 19 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
A new species of the Devonian lycopod genus, Leclercqia, from the Emsian of New Brunswick, Canada
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موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
فسیل شناسی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
A new species of the fossil lycopsid genus, Leclercqia, is reported from the Early Devonian (Emsian) of northern New Brunswick, Canada. The plant remains consist of dochotomizing axes covered with numerous, small, closely spaced leaves. The leaves are laminar and divided distally into five segments which curve upwards. An ellipsoidal sporangium attaches to the adaxial surface, proximal to divisions, of many leaves. Sporangia contain abundant and well-preserved spores assigned to the sporae dispersae genus Acinosporites. The habit of the plant is proposed to be that of an herbaceous lycopsid. Leclercqia andrewsii differs from the type species, L. complexa, in the organization of its leaf segments: all five segments curve or bend upward after the point of forking. The genus has previously been described from mostly Middle Devonian sediments of North America, South America (Venezuela), Australia (Queensland), and Europe, and also from the Early Devonian of North America. This account adds another Emsian occurrence of the genus Leclercqia in North America, documents a new species, and presents evidence of novel variation in early Devonian leclercqioid lycopsids relative to those present in the Middle Devonian.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Review of Palaeobotany and Palynology - Volume 137, Issues 3â4, December 2005, Pages 105-123
Journal: Review of Palaeobotany and Palynology - Volume 137, Issues 3â4, December 2005, Pages 105-123
نویسندگان
Patricia G. Gensel, Andrew E. Jr.,