Informações
Data: 22/04/2013 – 08:30:00
Fim: 22/04/2013 – 17:00:00
Onde: CNPEM – Rua Giuseppe Máximo Scolfaro, 10.000 – Campinas, SÃO PAULO 13280000 Brazil – Telefone: 19 35121267
Detalhes
An important aaproach to test the various hypotheses about the origin of the vertebrate chambered heart would be the analysis of the fossil record, especially from animals closer to the transition between invertebrate chordates and most primitive vertebrates. Unfortunately ,soft tissues only fossilize under extremely special circumstances. However, the relatively rigid pericardial membranes can leave impressions of the cardiac chamber outlines, such that round cavities are sometimes found posterior to gill slits, endostyle, or vessels in the fossils of fish or animals of disputed affinity, such as Haikouella lanceolata. These impressions are, however, of insufficient quality to define a heart, much less to allow the definition of chamber identities. Moreover, the heart chambers of primitive vertebrates, such as hagfish and lampreys, display considerable overlap in the A – P and dorsal – ventral axes, which may blur chamber outlines and further compound the already problematic identification of hearts in fossils. In summary, fossils of hearts, or of pumping organs,are extremely scarce difficult to interpret, controversial and thus, are not very informative.
Due to the difficulty of finding reliable data on this subject, it is important to first establish a solid foundation for the exploration of fossil of cardiovascular materials, with emphasis on fossils of vertebrates hearts. Thus, our goal is to systematically investigate in fossiliferous sites of high productivity and exceptional conservation the frequency of fossilization events of cardiovascular structures, their modes of fossilization, and to establish methods to identify these structures.
Dr. José Xavier Neto – LNBio
22nd April – 8:30 am
LNBio – Room 69
Campus – Centro Nacional de Pesquisa em Energia e Materiais – CNPEM
Giuseppe M. Scolfaro, 10.000 – Guará
Phone: (19) 3512-1010
