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Anais da Academia Brasileira de Ciências

Print version ISSN 0001-3765On-line version ISSN 1678-2690

Abstract

PARMERA, THAÍS C.C.; GALLO, VALÉRIA; SILVA, HILDA M.A. DA  and  FIGUEIREDO, FRANCISCO J. DE. Distributional patterns of Aptian-Albian paleoichthyofauna of Brazil and Africa based on Track Analysis. An. Acad. Bras. Ciênc. [online]. 2019, vol.91, suppl.2, e20160456.  Epub Mar 02, 2017. ISSN 0001-3765.  http://dx.doi.org/10.1590/0001-3765201720160456.

The Aptian-Albian paleoichthyofauna in Brazil and Africa is quite diverse, yet their geographic patterns still require accounts. This work consists of a panbiogeographical analysis of paleoichthyofauna from Aptian-Albian through track analysis. Geographic coordinates were obtained and converted into paleocoordinates. Individual Tracks (ITs) and Generalized Tracks (GTs) were built with the aid of ArcView GIS v3.2 program using Trazos2004 extension. As a result, four GTs and tree Biogeographic Nodes (A, B and C) had been identified. GTs 1 and 2 shows two different faunas. GT3 indicates similarity between Brazil and Africa paleoichthyofauna suggesting the break-up of Gondwana as the event that separated it. GT4 represents a probable local seaway produced by transgressions. In the Node A a unique fauna was found indicating the presence of a third biota with its own characteristics. Node B is associated with the break-up of the supercontinent Gondwana. Node C was related to fauna exchange promoted by marine ingression and epicontinental seas that occurred during Aptian-Albian. We concluded that there is a relationship between the distributional patterns of biota and events such as the break-up of Gondwana, the formation of Atlantic Ocean and eustatic movements that affected South America and Africa.

Keywords : Aptian-Albian; Gondwana Break-up; historical biogeography; track analysis..

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