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Foot bone evolution helped prehistoric mammals thrive
Reconstruction of a Paleocene periptychid condylarth, an ungulate-like mammal that lived around 65 million years ago.

Study shows spike in evolution after dinosaur extinction helped mammals prosper.

The evolution of foot and ankle bones helped mammals to adapt and thrive following the extinction of dinosaurs, according to new research.

The study by the University of Edinburgh suggests that a spike in evolution after dinosaurs became extinct allowed mammals to diversify and prosper during a time of intense global change.

Palaeontologists studied bones that form part of the ankle and the heel and found that mammals during this time, known as the Paleocene Period, were less primitive than earlier believed. Their findings are published in the journal, Proceedings of the Royal Society B.

“At the core of our study, we wanted to figure out what Paleocene mammals were doing in terms of their anatomy and how this related to aspects of their lifestyle and evolution in the wake of the dinosaur extinction,” explained Dr Sarah Shelley, from the University of Edinburgh’s School of GeoSciences.”

In the study, researchers compared the anatomy of Paleocene mammals with species from the earlier Cretaceous period and those that exist today.

They analysed the foot and ankle bone measurements of 40 Paleocene species to reveal a snapshot into the animals’ lifestyle and body size. They then compared the results with data from living mammal species and mammals that existed during the Cretaceous Period.

Their study reveals that Paleocene mammals were stockier and more muscular than those from the Cretaceous Period or today. The Paleocene mammals' joints were also very mobile, with support from the ligament and tendons instead of the bony features in some living mammals.

The team believes that this mobility enabled the mammals to adapt and thrive much quicker following the dinosaur extinction. Many species’ ankles and feet were remarkably similar to living ground-dwelling and burrowing mammals, suggesting that these lifestyles were crucial to their survival.

Mammals that could burrow underground, for example, were more likely to survive the initial devastation of the asteroid hitting. The loss of tree habitat after the extinction may have advantaged ground-dwelling species..

“Paleocene mammals have this tendency to combine unusual mish-mashes of anatomy but are often seen as ‘archaic’ and unspecialised precursors to living mammal groups. What we found was this incredible diversity – they’re adapting and evolving their robustly built bodies in ways that are different to living mammals," said Dr Shelley.

 
“Our results show one of the many ways mammals were able to adapt and thrive following the catastrophic devastation of the end-Cretaceous extinction.”

Image (C) Dr Sarah Shelley.

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VetCT app offered to students and new graduates

News Story 1
 The VetCT app is being offered for free to students and new veterinary graduates for their first three months in practice. The app provides a service for vets to send case information to a global team of Diploma-holding specialists, who can provide advice and support via instant call-back, text chat, written report, or virtual appointment.

Time on the app is automatically logged as CPD with quarterly certificates being generated for users. Additional services include the ability to book bespoke CPD, significant event reviews, and live training sessions such as surgical procedures.

The app is downloadable for both iOS and Android systems. 

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HORIBA to host CPD webinar

HORIBA has announced that it will host an online CPD meeting focusing on 'Exotic Parasites - The Importance of Testing in The Imported Dog'. Ian Wright (BVMS, MSc, MRCVS), head of ESCCAP UK and Ireland, will present on the importance of testing protocols in diseases of imported dogs.

The meeting will provide attendees with an overview of emerging veterinary diseases with a particular focus on exotic parasites, and discuss the importance of accurate testing protocols and equipment, alongside a final Q&A session.

The webinar will take place on Thursday July 1, from 19.30pm to 21.00pm BST. For free registration and more information visit the Horiba website or register.gotowebinar.com