Evolutionary mode of the ostracod, Velatomorpha altilis , from the Joggins Fossil Cliffs UNESCO World Heritage Site

A study of the estuarine ostracod Velatomorpha altilis from the Joggins Fossil Cliffs UNESCO World Heritage Site reveals that evolutionary stasis—minimal change in size and shape over 2–3 million years—dominates its development. This finding supports the hypothesis that organisms in fluctuating, stressed environments exhibit genetic stability to adapt to long-term environmental shifts. Researchers analyzed nearly 400 specimens using quantitative models and stable isotope analysis, though isotopic data indicated diagenetic alteration, precluding primary paleoenvironmental insights. The study underscores stasis as a potential trend in marginal ecosystems, encouraging further investigation of other organisms in such settings.

Grey, M., Finkel, Z. V., Pufahl, P. K., & Reid, L. M. (2012). Evolutionary mode of the ostracod, Velatomorpha altilis , from the Joggins Fossil Cliffs UNESCO World Heritage Site. Lethaia, 45(4), 615–623. https://doi.org/10.1111/j.1502-3931.2012.00328.x