Abstract:Despite being known since the 19th century, systematic studies of Bivalvia still face major challenges due to preservation problems of diagnostic characters and the number of specimens per taxon. Some species are well known and abundant while most are represented by few specimens or even just by their holotype. Thus, many remain considered invalid according to the International Zoological Nomenclature Code. Here we discuss the taxonomic problems about the Devonian Bivalvia group in Brazil, emphasizing biodiver… Show more
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