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Structural extremes in a cretaceous dinosaur.

Paul C Sereno¹, Jeffrey A Wilson, Lawrence M Witmer

¹Department of Organismal Biology and Anatomy, University of Chicago, Chicago, Illinois, United States of America. dinosaur@uchicago.edu

|November 22, 2007

Summary

This summary is machine-generated.

Nigersaurus taqueti, an Early Cretaceous dinosaur, possessed unique ground-level herbivory adaptations. Its specialized skull and rapid tooth replacement reveal a novel feeding strategy within the diplodocoid sauropods.

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Area of Science:

Paleontology
Vertebrate Anatomy
Evolutionary Biology

Background:

Rebbachisaurid sauropods are poorly understood, particularly their cranial anatomy and feeding strategies.
Nigersaurus taqueti fossils provide a unique opportunity to study an Early Cretaceous rebbachisaurid.

Purpose of the Study:

To describe the cranial anatomy of Nigersaurus taqueti.
To investigate its feeding function and strategy within the broader context of diplodocoid evolution.
To reconstruct its phylogenetic relationships.

Main Methods:

High-resolution computed tomography (CT) and stereolithography for skull reconstruction.
Molding and casting techniques for fragile fossil material.
Photographic-casting and thin sections for dental analysis.
CT-based cranial endocast for brain and inner ear analysis.
Maximum parsimony algorithms for phylogenetic analysis.

Main Results:

Nigersaurus taqueti exhibits extreme adaptations for ground-level herbivory: a lightweight skull, distal tooth batteries, rapid tooth replacement (monthly), a downward-facing muzzle, and hollow vertebrae.
The first sauropod cranial endocast reveals details of the brain (olfactory bulbs, cerebrum) and inner ear, indicating habitual head posture.
Phylogenetic analysis places Nigersaurus within the diplodocoids, supporting a Jurassic origin for low-browsing feeding strategies.

Conclusions:

Nigersaurus taqueti represents a specialized herbivore with a unique feeding strategy, challenging previous hypotheses about diplodocoid feeding.
Its adaptations highlight the diversity of feeding strategies within sauropod dinosaurs.
This study provides significant insights into the paleobiology and evolution of rebbachisaurids.