Abstract
A preliminary diagnostic test summary balance sheet and rough on the marine and continental mollusc fauna, terrestrial and limnic/freshwater, occurring in the geopolitical region of the Southern Brazil and adjacent is presented. Result of extensive research work in the field and analysis of regional natural history reference generated off dilated bibliographic production, developed in the course of the last 13 years (1996~2009), aims to characterize and integral organization of their unique knowledge, emphasizing the major ecological and geographical factors that determine their presence, spatial location and occupancy of available environments. Parallels, the comparative results regarding the total numbers of species estimated for each of the portions of the territory geo-spatial components analyzed, the Brazilian states of Parana (PR, 332), Santa Catarina (SC, 772), Rio Grande do Sul (RS, 492), and the neighboring countries of its southern Uruguay (373) and Argentina (535), members as a whole so-called Atlantic Slope region of the Southern Cone of South America, to the West of the Andes.
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