Fossil of Late Cretaceous Fish Acronichthys maccagnoi Discovered in Alberta Reveals Insights into Otophysan Evolution

Researchers in southwestern Alberta have uncovered a fossilized fish species from the Late Cretaceous period that provides new insights into the evolutionary history of otophysan fish, a group that includes catfish and carp. The discovery, named *Acronichthys maccagnoi*, represents a significant addition to scientific understanding of one of the most diverse and widely distributed groups of freshwater fish alive today. The fossil dates back to an era dominated by large dinosaurs such as *Tyrannosaurus rex*.

The newly identified species is notable for its small size and unique anatomical features, which researchers believe may shed light on how otophysan fish evolved over millions of years. Otophysans are distinguished by their Weberian apparatus, a specialized structure that enhances hearing capabilities. Scientists suggest that studying *Acronichthys maccagnoi* could help trace the development of this key adaptation. The discovery also highlights the biodiversity present during the Late Cretaceous period, offering clues about ecological dynamics in prehistoric freshwater environments.

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Date: October 2, 2025

Author

Mark Chiang