SEMELHANTES A FLEEX PLUS

Finally, we discuss how our morphological measurements compare to ichthyosaur measurements from the literature noting that similarities in functional morphology suggest sharks may be a good analog for understanding ichthyosaur swimming biomechanics.ĭie Ähnlichkeiten zwischen Ichthyosauriern und Haien ist ein Lehrbuchbeispiel für Konvergenz, und Ähnlichkeiten in der Schwanzflossenmorphologie haben zu der Theorie geführt, dass beide ähnliche Schwimmstile aufwiesen. We also found structural differences that may enable the tail slapping behavior of the common thresher shark. Our results suggest that the cross-sectional profile of the skeletally supported dorsal lobe dictates flexural stiffness, but that changing tissue composition dictates flexural stiffness in the ventral lobe. As expected, lunate tails were overall less flexible than heterocercal tails and had greater flexural stiffness.

SEMELHANTES A FLEEX PLUS

We measured flexibility in 10 species and focused on five species in particular, for dissection: one pelagic and one bottom-associated individual from each order, plus the common thresher shark ( Alopias vulpinus), a tail-slapping specialist. Because it is not possible to measure ichthyosaur tail function, the goal of this study is to measure and compare the flexibility and stiffness of lunate and heterocercal shark tails, and to measure skeletal and connective tissue features that may affect tail flexibility. In particular early ichthyosaurs have asymmetrical tails like the heterocercal tails of carcharhinid sharks, while later occurring ichthyosaurs have lunate tails similar to those of lamnid sharks. The variation of ichthyosaur tail shapes is encompassed within the diversity of shark families. The similarities between ichthyosaurs and sharks are a text-book example of convergence, and similarities in tail morphology have led many to theorize that they had similar swimming styles.

Semelhantes a fleex