Notes on the systematics, morphology and biostratigraphy of holoplanktic Mollusca, 26. An unexpected pteropod occurrence (Euthecosomata, Limacinidae) in euryhaline Early Oligocene mollusc assemblages in the Belgian province of Limburg

The pteropod species Limacina ernstkittli Janssen, 2012, described from the Chattian (Late Oligocene) of northern Germany and Malta, is recorded from euryhaline depos­its of Rupelian (Early Oligocene) age in Belgium. Its occur­rence in near coastal, not fully marine assemblages, antic­ipating earlier records with at least 5 mA, is surprising. Critical notes are provided regarding the introduction of the name Borgloon Formation in 1988 without the desig­nation of a type locality / type section; we recommend to replace it by the name Atuatuca Formation which was coined in 1976 and being accompanied by a fully described type locality and type section.