Ostracods (Crustacea) through Permian–Triassic events

摘要: Abstract Through geological times, the main turnover of marine ostracod group occurred at Permian–Triassic boundary (PTB) when Palaeozoic world gave way to Meso-Cenozoic world. As quite all groups, ostracods intensively suffered end events but they have particularity pass PTB and be present in environments. We studied assemblages from best preserved sections through These are, for most them, located along Palaeo-Tethys margins: South China Block Tibet (R.P. China), Bukk Mountains (Hungary), Dolomites (Italy), Taurus (Turkey) Elbourz (Iran). areas different environmental settings very shallow water deep shelf. The biostratigraphy is well constrained by presence conodont index. In environment external shelf slope, Permian disappear slightly before are absent Early Triassic. last representatives palaeopsychrospheric forms occur early Anisian. On platforms, during Late Permian, abundant highly diversified everywhere Peri-Tethyan margins. typical mixed with first representatives. specific extinction rates, latest vary 74% 100%. During earliest Triassic, two considered: or without microbialitic deposits. development microbialites gives favorable ecological conditions ostracods. Griesbachian, fauna composed both new comers surviving forms. reduction size frequently observed. This interval called “survival stage”. Dienerian Smithian scarce poor. substages represent maximum poverty fauna, may due anoxia on platforms. Spathian, occurs beginning true recovery. found Anisian which radiation stage comers. Palaeozoic–Meso-Cenozoic long (about 15 My).