Tiny bivalve found in Brazil sheds light on tropical Atlantic biogeography

phys.org | 7/8/2008 | Staff
ArceusArceus (Posted by) Level 3
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For the first time, the bivalve mollusc Guyanella clenchi has been reported from Abrolhos Bank, Brazil. This almost unknown bivalve had previously been reported solely from the Caribbean region. Apart from being the southernmost record for the species, its presence also helps the experts to determine the way the marine fauna from the Caribbean interacts with its South American relatives.

The bivalve, which is a minute mollusc of only a few millimetres, had been known from Suriname, Guadeloupe, Colombia and French Guiana for nearly half a century. However, it is almost absent from the bibliographical registers and zoological collections.

Cruises - Abrolhos - Bank - Bahia - Brazil

Then, during recent cruises to Abrolhos Bank (Bahia, Brazil) carried out as part of the Pro-Abrolhos project at Instituto Oceanografico da Universidade de Sao Paulo (IO-USP), the researchers unexpectedly retrieved enough specimens to document the mysterious species from the Brazilian site. The resulting study is published in the open-access journal Check List.

According to the scientists, the discovery is very important for the understanding of the interaction between the mollusc faunas from the Caribbean and Southern Atlantic regions. While a mixture of these had long been known at both localities, serving as evidence that many species are indeed capable of crossing the geographical barriers between the two oceanic areas, it seems that no one...
(Excerpt) Read more at: phys.org
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