Depredación de ostrácodos del Cuaternario del sur de la provincia de Buenos Aires, Argentina

the presence of fossil traces in ostracods valves from different quaternary palaeoenvironments in southern buenos aires province, argentina, are studied in this paper. a number of 12500 specimens were analyzed and a total of 33 bored valves were separated. two types of depredation fossil traces were determined: oichnus simplex bromley and oichnus paraboloides bromley, which comprised more than 60% of the total boreholes. the highest percentage of valves with evidence of predation (3.33%) was registered in sediments of a continental permanent lagoon with favourable trophic conditions and high density of ostracods. there was not relationship between the borehole diameter and the size of the predated valves. evidences of depredation were registered in species with smooth valves as well as in species with adorned valves.