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Habitat Availability, Jurassic and Cretaceous Origins of the Deep-Bodied Shark Morphotype and the Rise of Pelagic Sharks

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Resumen del artículo

Título de Paperzilla
Shark Body Shape Evolution: From Bottom-Dwellers to Speed Demons of the Deep

This study uses phylogenetic analysis and fossil data to trace the evolution of shark body shape, finding three distinct morphotypes and linking the rise of the pelagic (deep-bodied) form to increased habitat availability during the Jurassic and Cretaceous periods.

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Sharks started as flat, bottom-dwelling creatures. When the oceans got deeper and warmer, some evolved sleeker bodies for hunting in the open water.

Posibles conflictos de intereses

None identified

Limitaciones identificadas

Reliance on Illustrations
The study uses illustrations rather than direct measurements from specimens, potentially oversimplifying body form variations within species.
Simplified Macroevolutionary Model
The study uses a standard Mk model, which may not capture the complexities of trait evolution and adaptation as effectively as more nuanced models.
Phylogenetic Uncertainty
The analysis relies on a polytomy-resolved phylogeny, which introduces limitations due to uncertainties in the evolutionary relationships between certain shark groups.

Explicación de la calificación

This study provides valuable insights into shark evolution by combining phylogenetic analysis with environmental data. While some methodological limitations exist, the findings are robust and contribute significantly to our understanding of the interplay between morphology, ecology, and environmental change in deep time.

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Información del archivo

Título original: Habitat Availability, Jurassic and Cretaceous Origins of the Deep-Bodied Shark Morphotype and the Rise of Pelagic Sharks
Subido: 8 sept 2025, 18:55:26
Privacidad: Público