Reference : Runcaria, a middle Devonian seed plant precursor
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Earth sciences & physical geography
http://hdl.handle.net/2268/13143
Runcaria, a middle Devonian seed plant precursor
English
Gerrienne, Philippe mailto [Université de Liège - ULg > Département de géologie > Paléobotanique - Paléopalynologie - Micropaléontologie (PPM) >]
Meyer-Berthaud, B. [> > > >]
Fairon-Demaret, Muriel mailto [Université de Liège - ULg > Services généraux (Faculté des sciences) > Relations académiques et scientifiques (Sciences) >]
Streel, Maurice mailto [Université de Liège - ULg > > Département de géologie >]
Steemans, Philippe mailto [Université de Liège - ULg > Département de géologie > Paléobotanique - Paléopalynologie - Micropaléontologie (PPM) >]
29-Oct-2004
Science
Amer Assoc Advancement Science
306
5697
856-858
Yes (verified by ORBi)
International
0036-8075
1095-9203
Washington
[en] The emergence of the seed habit in the Middle Pateozoic was a decisive evolutionary breakthrough. Today, seed plants are the most successful plant lineage, with more than 250,000 living species. We have identified a middle Givetian (385 million years ago) seed precursor from Belgium predating the earliest seeds by about 20 million years. Runcaria is a small, radially symmetrical, integumented megasporangium surrounded by a cupule. The megasporangium bears an unopened distal extension protruding above the multilobed integument. This extension is assumed to be involved in anemophilous pollination. Runcaria sheds new light on the sequence of character acquisition leading to the seed.
http://hdl.handle.net/2268/13143
also: http://hdl.handle.net/2268/17248
10.1126/science.1102491

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