Our study investigates how tropical marine ecosystems responded to climate change during the Eocene–Oligocene transition (~34 Ma). Based on microfossil and geochemical data from a Caribbean drill core, we identify enhanced terrigenous input, increased surface productivity, changes in carbonate preservation, and reduced deep-water oxygenation. Likely driven by global cooling and sea-level fall, these shifts offer new insights into low-latitude paleoenvironmental change.

The tectonic setting of the Deşli Caira section that was overlooked by Martyn Golding in his paper on the Olenekian/Anisian conodonts from the Deşli Caira section (Romania) is clarified. The sedimentary succession is faulted, but the offset is very minor and easy to detect. Unfortunately the author did not take the fault into account; therefore, the stratigraphic position of his samples is uncertain. 

The story of Cyprideis pannonica offers a fascinating insight into how environmental change shapes biodiversity. Over 2 million years, this tiny ostracod adapted to habitats that transformed from a sea into a lake. Originally varied in shape and size, Cyprideis diversified into many species during periods of ecological complexity. These findings demonstrate that even small organisms can reveal big evolutionary patterns – linking habitat changes, speciation, and adaptation within a dynamic landscape.