The Lower Miocene cytherellids (Crustacea, Ostracoda) from the Pelotas Basin and their significance for the South Atlantic Paleozoogeography

Abstract

-A taxonomic study of the family Cytherellidae Sars was carried out in Lower Miocene deposits of the well 2-RSS-1 (Pelotas Basin, southeastern Brazilian margin). Five species were recognised, two of them describe herein: Inversacytherella atlantica sp. nov. and Cytherella pelotensis sp. nov. Cytherella pleistocenica Bergue et al. is reassigned into Inversacytherella Swanson et al. This is the fi rst report of the genus Inversacytherella in the Atlantic. Three species are left in open nomenclature due to the scarcity of specimens. One of them is tentatively identifi ed as Grammcythella Swanson et al., a genus that has been recorded so far only in the Oceania. The occurrences of Inversacytherella and Grammcythella constitute additional evidence for faunal interchanges between America and Oceania, triggered by hydrological changes in the Southern Ocean during the Neogene.

Climatically induced changes in late Quaternary bathyal ostracod assemblages of the Camamu Basin, Brazil

“…nov. differs from most species of the genus recorded in the BCM in having the surface totally smooth. It is somewhat similar to Inversacytherella pleistocenica (Bergue et al 2007, Manica et al 2015, but the latter has more subelliptical LV outline and LV larger than RV. Cytherella pindoramensis sp.…”

“…Swanson et al (2005) proposed the genus Inversacytherella to accommodate cytherellids with a reverse overlap pattern (i.e., LV > RV) and unusual AMS composed of over 20 individual scars. Fossil Inversacytherella species were registered in Brazil by Bergue et al (2007Bergue et al ( , 2019 and Manica et al (2015). Although AMS of Cytherella pindoramensis sp.…”