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Diversity and disparity in mammalian fossil assemblages of the John Day Formation, Oregon, USA

Genuine artifacts tell the richest stories that fill our souls. And they fuel the scientific enterprise.

Explore Great Plains natural history at the Sternberg Museum (Hays, KS): fossils, rotating exhibits, educational programs, tours, and camps.

Many-to-one mapping of locomotor mode: a case study in the pelvic morphology of two basal hyaenodonts

A revision of the biostratigraphy of oreodonts (superfamily Merycoidodontoidea) in the John Day region of Oregon, USA

Updates to the caniform fauna (Carnivora, Caniformia) of the John Day Formation, Oregon, USA

In this study, we virtually reconstruct the vertebral column of Pezosiren portelli, a four-limbed stem sirenian (Pan-Sirenia, Prorastomidae) from the Eocene of Jamaica. We used three-dimensional models of various vertebrae obtained through surface scanning of fossil remains and we applied several algorithms for virtual repair, including retrodeformation of distorted vertebrae or mirroring missing processes from their bilateral counterparts. To quantify the regional morphology of P. portelli, we digitized a set of homologous landmarks, following a standardized protocol retrieved from previous morphometric studies on the evolution of the mammalian backbone. The results reveal a cervical region with relatively long spinous processes, as well as a thoracic region subdivided into prediaphragmatic and postdiaphragmatic regions with an unspecialised lumbar region. Both aspects reveal anatomical traits typical of terrestrial mammals, suggesting that P. portelli may exhibit a mosaic evolutionary pattern, showing postcranial traits typical of terrestrial taxa but also early aquatic adaptations found in its cranial skeleton. Finally, we briefly discuss the implications of morphometric analyses of the P. portelli vertebral column for understanding the evolution of axial features in other secondarily aquatic tethytherians.

Postcrania and locomotor function of Mesocyon coryphaeus (Canidae, Carnivora) from the Arikareean of North America

Postcrania and locomotor function of Mesocyon coryphaeus (Canidae, Carnivora) from the Arikareean of North America

These positions may be filled for a six month seasonal period, but can vary due to weather conditions, project needs, or funding. Anticipated Entry on Duty: <strong>April 2026</strong> <p>For more par...

PhD Project - ACCE+ DLA Programme: Morphological Trait Evolution in Isolated Populations of Large Mammals and its Implications for Rewilding in the UK at University of Liverpool, listed on FindAPhD.co...

YouTube video by Gray's Vertebrate Anatomy

Squamates (lizards, including snakes) are the most diverse group of terrestrial vertebrates on Earth today and have an evolutionary history dating back to at least the Middle Triassic (ca. 242 Mya). D...

Background As science becomes more open and accessible, researchers are increasingly encouraged—and sometimes required—to share their digital data on public repositories. While this promotes transpare...

Collections study grants provide financial assistance for graduate students and post-doctoral researchers to study the collections of the University of Washington Burke Museum (UWBM).

Taeniolabis taoensis, the largest known multituberculate, is craniodentally one of the most well-known mammals from the early Paleocene of the Western Interior of the United States of America. Althoug...

Five years after the outbreak of the SARS-CoV-2 pandemic, we have the opportunity to gather lessons learned about needed infrastructure for predicting, und