Gandolfo, Maria , Zamaloa, Maria , Caviglia, Nicolas .
Revisiting the Argentinean monocotyledon fossil record.
The monocotyledons constitute roughly 22 % of the angiosperms, with approximately 3.000 genera and 65.000 species, including several economically important groups. Due to many reasons, they have a low likelihood of being fossilized and this is reflected in the sparse known fossil record for the group. Herein, we revise the Argentinean monocot fossil record from the late Aptian (~112 ma) to the Miocene (~ 5 ma). Fossils include pollen, phytoliths, leaves, fruits and trunks. The first occurrences are represented by pollen fossil assigned to the extinct genus Liliacidites and comes from the Aptian-Albian outcrops of the La Cantera Fm (San Luis Province). The oldest macrofossils are stems belonging to the fossil taxon Palmoxylon, a member of Arecaceae, collected from sediments of the Late Cretaceous Allen (Neuquen Province) and Colipilli (Rio Negro Province) Fms. Families with reliable micro and/or macrofossil record are Poaceae, Cyperaceae, Restionaceae, Potamogetonaceae, Hydrocharitaceae, Arecaceae, and Sparganiaceae/Typhaceae. Within the record, there are some taxa, such as Liliacidites and Stellatopollis (pollen) and leaves with parallel venation, with highly probable monocot affinities, however more comprehensive studies on these fossils are needed to assess and confirm their taxonomic placement.
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1 - Cornell University, LH Bailey Hortorium, Department of Pant Biology, 410 Mann Library Biulding, Ithaca, NY, 14853-4301, USA
2 - Universidad de Buenos Aires, Depto. Ecología, Genética y Evolución, Int. Güiraldes 2620, Buenos Aires, Buenos Aires, C1428EHA, Argentina
3 - Universidad de Buenos Aires, Depto. Ecología, Genética y Evolución, Int. Güiraldes 2620, Buenos Aires, C1428EHA,, Argentina
Presentation Type: Oral Paper:Papers for Sections
Location: 555A/Convention Center
Date: Tuesday, August 3rd, 2010
Time: 11:30 AM