A new deep-marine elasmobranch fauna from the Late Cretaceous of Bergen (Bavaria, Germany) dominated by squaliform sharks

PalZ, Год журнала: 2025, Номер unknown

Опубликована: Апрель 1, 2025

Язык: Английский

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Ecological restructuring of North Tethyan marine vertebrate communities triggered by the end-Cretaceous extinction

Proceedings of the National Academy of Sciences, Год журнала: 2025, Номер 122(22)

Опубликована: Май 19, 2025

The ecological upheavals produced by the Cretaceous–Paleogene mass extinction event (K-Pg, −66 Ma) have been mostly studied at large scale with emphasis on clades’ diversity dynamics. How this affected structure of paleocommunities is comparatively less investigated, especially within vertebrate clades like fish. Here, we quantified changes in contribution elasmobranchs (sharks, skates, rays) and actinopterygians (ray-finned fishes) to fish community across K-Pg analyzing ichthyolith (fossil teeth denticles) abundance through time. Based extensive sampling 20 horizons from two outcrops spanning Austria (>4 tons rock, >9,000 ichthyoliths), show that fostered elasmobranch while reducing actinopterygian density Tethys Ocean. Elasmobranch dominance postextinction communities not driven estimated local environmental change (paleobathymetry, bottom-water oxygenation) may relate greater independence clade lower trophic levels their ecology early life stages than actinopterygians. We further measured size assemblages found initiated an increase range niche space occupied simultaneously demise communities. Finally, using fine taxonomic resolution fossil record, demonstrate fluctuations controlled richness, which are decoupled global-scale upheavals. Our results challenge previous hypotheses provide insights into global regional forcing over a event.

Язык: Английский

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Frilled Sharks (Hexanchiformes, Chlamydoselachidae): New Data on Their Diversity and Distribution

Paleontological Journal, Год журнала: 2024, Номер 58(5), С. 567 - 577

Опубликована: Окт. 1, 2024

Язык: Английский

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