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Comparison between eustatic T-R cycles around the Devonian-Carboniferous boundary and the distribution of the ostracode taxon Pseudoleperditia gr. venulosa
The stratigraphic range bars of the palaeocopid ostracode taxon Pseudoleperditia gr. venulosa form distinct clusters in the latest Devonian (Strunian) and Early Carboniferous (Tournaisian). These clusters are correlated with the transgressive phases of the presumably eustatic Late Devonian/Early Carboniferous transgression-regression (T-R) cycles, which have been distinguished in the literature. This peculiar correlation pattern corroborates the sigmoidal pattern of Late Devonian ostracode range bars established by Lethiers (1983) and Colin & Lethiers (1988). Most likely, transgression or sea level rise resulted in the creation of new ecological niches stimulating the geographical expansion of P. gr. venulosa, whereas regression or sea level fall destroyed these niches causing the transitory or eventually final disappearance of this taxon.