A new study found that spinosaur dinosaurs had specialized salt-excreting adaptations around their eyes, allowing them to thrive in coastal brackish environments. The research examined fossil evidence and comparative anatomy to reconstruct how these predators managed excess salt intake from prey and water in estuarine habitats.
Spinosaurids are known for elongated skulls, conical teeth, and in some species sail-like dorsal structures, but their ecological niche remained debated among paleontologists. Salt-excreting glands similar to those in modern marine reptiles and birds would explain how they hunted in environments where freshwater and seawater mix.
Brackish coastal zones offer abundant food sources but pose physiological challenges for land-dwelling vertebrates unadapted to saline conditions. The eye-region adaptations identified in the study suggest spinosaurs occupied ecological roles distinct from other large theropod dinosaurs confined primarily to inland territories.
Paleontologists said the findings refine understanding of dinosaur diversity and habitat use during the Mesozoic era. Further fossil discoveries may test whether all spinosaur species shared similar salt-management traits or whether adaptations varied across the group’s geographic range.
Comparative studies of extinct spinosaurs and modern crocodilians help paleontologists model how semi-aquatic predators exploit coastal food webs across geological timescales. Museum collections and field excavations continue yielding specimens that refine anatomical reconstructions used to test hypotheses about salt tolerance and hunting behavior in Mesozoic ecosystems.
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Sources:
https://www.science.org/