Abstract
The Cypridacea first entered non-marine environments in a sustained invasion in the Upper Bathonian. They were, until the late Tithonian, subordinate to the only other Mesozoic non-marine ostracods, the Darwinulacea and the Limnocytheridae. In the late Tithonian and Neocomian, however, they became pandemic in their distribution and totally dominated the other two groups. The great rapidity of their dispersal is attributed to their having evolved, late in the Jurassic, the ability to reproduce parthenogenetically and to lay desiccation and freezing resistant eggs. The great increase in their diversity at the Jurassic-Cretaceous boundary is thought in part to be due to their ability to swim, a facility denied their competitors. It is suggested that the late Jurassic non-marine Cypridacea constitute an excellent example of “Hopeful Monsters”. The possible passive dispersal of ostracods by Mesozoic vertebrates is discussed.
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Whatley, R. (1990). The relationship between extrinsic and intrinsic events in the evolution of Mesozoic non-marine Ostracoda. In: Kauffman, E.G., Walliser, O.H. (eds) Extinction Events in Earth History. Lecture Notes in Earth Sciences, vol 30. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0011150
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DOI: https://doi.org/10.1007/BFb0011150
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