Shell-Cracking Turtles Survived the Mass Extinction Event
The asteroid impact at the end of the Cretaceous period, approximately 66 million years ago, triggered one of the most significant mass extinction events in Earth’s history. While this catastrophe led to the demise of many species, including the dinosaurs, some organisms demonstrated remarkable resilience. Recent research indicates that turtles, in particular, fared relatively well, and their survival may be linked to their dietary preferences.
Dietary Specialization as a Survival Strategy
A study published in the journal Biology Letters, led by paleontologist Serjoscha Evers at the Bavarian State Collection of Natural History (SNSB), reveals that turtles with a preference for hard-shelled organisms – such as snails and mussels – were significantly more likely to survive the Cretaceous-Paleogene (K-Pg) extinction event. These turtles were more than five times more likely to survive than those that hunted fish or were herbivores.
“We are observing an ecological filter,” explains Evers. “The specialization on hard-shelled food gave these turtle species an evolutionary advantage.” This advantage is likely due to the resilience of gastropods and bivalves to the catastrophic effects of the impact. While herbivores struggled in the aftermath of the impact – facing a collapse of the food chain – and carnivores subsequently suffered, snails and other opportunistic species were able to endure. Turtles that specialized in these prey sources were therefore less vulnerable.
Analyzing Turtle Jaws to Understand Past Diets
The research team, including Guilherme Hermanson from the University of Friborg in Switzerland, constructed a comprehensive dataset analyzing the anatomical features of turtle jaws. These features provided insights into the dietary habits of various turtle lineages at the time of the K-Pg boundary. By employing statistical models, the paleontologists were able to assess the correlation between diet and extinction probability in turtles.
Implications for Understanding Extinction Patterns
This study highlights the importance of ecological adaptation in determining survival during mass extinction events. The ability to exploit resilient food sources proved crucial for turtles navigating the challenges posed by the K-Pg extinction. The findings contribute to a broader understanding of how species respond to catastrophic environmental changes and the factors that influence their long-term survival.
Ongoing Research and Future Directions
Serjoscha Evers leads the Urwelt Museum Upper Franconia, one of ten museums within the Bavarian State Natural Science Collections. Further research is planned to explore the specific mechanisms that allowed hard-shelled organisms to withstand the K-Pg extinction and the broader implications for understanding the resilience of different ecosystems.
Scientific Contact:
Dr. Serjoscha Evers
Museum management
SNSB – Urwelt-Museum Upper Franconia
Chancellor Street 1, 95444 Bayreuth
Tel.: 0921 511 211
Email: evers@snsb.de
Original Publication:
Guilherme Hermanson, Serjoscha W. Evers; Ecological selectivity of diet on turtle K/Pg survivorship. Biol Lett 1 March 2026; 22 (3): 20250790.
Further Information:
State Natural Science Collections of Bavaria (SNSB)
Prehistoric World Museum Upper Franconia (SNSB-UMO)
Worth a look