Evolutionary Biology of Marine Reptiles
Summary
Marine reptiles have evolved multiple times from terrestrial ancestors. The group encompasses diverse lineages that invaded the sea during the Mesozoic and Cenozoic eras. Key radiations include the ichthyosaurs and plesiosaurs of the Triassic to Cretaceous, and the mosasauroids of the Late Cretaceous. More recent marine lineages comprise sea turtles, pinniped-like crocodyliforms and secondarily aquatic squamates. This repeated secondary adaptation involved profound morphological transformations: streamlined, fusiform body plans; limb modification into flippers; development of crescent-shaped tails; and specialised feeding apparatuses. Patterns of convergent evolution often emerge, as distantly related clades evolve similar hydrodynamic profiles and locomotory modes. Phylogenetic analyses have elucidated the branching order of major clades and revealed the tempo of their diversification. Fossil discoveries continue to refine biogeographic histories, revealing dispersals across ancient seaways and faunal exchanges in equatorial, temperate and polar realms. Recent work highlights the role of ecological opportunity, competition and climatic events in driving morphological innovation and disparity among marine reptile assemblages. The evolutionary history of marine turtles documents multiple origins of pelagic habits and remarkable lineage longevity. Collectively, these studies underscore the dynamic interplay of functional adaptation, environmental change and phylogenetic constraint in shaping marine reptile evolution.
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Evolutionary Biology of Marine Reptiles publication trend
The graph below shows the total number of articles in evolutionary biology of marine reptiles across all publications each year (not limited to Nature Index journals).
Technical terms
Secondary adaptation: The evolutionary process by which terrestrial organisms reacquire aquatic lifestyles.
Convergent evolution: The independent emergence of similar traits in unrelated lineages due to comparable selective pressures.
Hydropedality: A limb morphology in which digits are elongated and often webbed to enhance aquatic propulsion.
Ecomorphological disparity: Variation in form and function among species related to their ecological roles.
Morphospace: A multidimensional coordinate system representing morphological variation within and among clades.
Cladistic analysis: A method of reconstructing evolutionary relationships by comparing shared derived characters.
References
- A new lower Turonian mosasaurid from the Western Interior Seaway and the antiquity of the unique basicranial circulation pattern in Plioplatecarpinae. Cretaceous Research (2023).
- Climate, competition, and the rise of mosasauroid ecomorphological disparity. Palaeontology (2022).
- Stelladens mysteriosus: A Strange New Mosasaurid (Squamata) from the Maastrichtian (Late Cretaceous) of Morocco †. Fossil Studies (2023).
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