Evolution of Oligo-Miocene talpids (Mammalia, Talpidae) in Europe: focus on the genera Myxomygale and Percymygale n. gen.

Abstract

New material recovered in the Oligocene locality St-Martin-de-Castillon (Vaucluse, France; MP24) provides a better knowledge of the characteristics of the species vauclusensis in its type-locality, hitherto assigned to the genus Myxomygale (Talpinae, tribe Urotrichini). In Europe, the species assigned to Myxomygale range from Late Eocene/Early Oligocene to the end of the Middle Miocene (MN 7/8). However noticeable differences can be observed in mandibles of these taxa, sometimes even coexisting in the same localities. We propose for the plesiomorphic branch (including M. vauclusensis and M. minor) a new genus, Percymygale, closely related to Myxomygale. Percymygale is consequently also assigned to the tribe Urotrichini. Today, the tribe Urotrichini (American and Japanese shrew-moles) is composed of terrestrial, semi-fossorial species, not well adapted to digging but able to climb small bushes, and foraging in grasslands, forests and covered landscapes. As a result, their limbs protrude laterally from the body (unlike in moles) and their humeri are usually longer with very limited adaptations to digging. Humeri are poorly known for Myxomygale and only fragmentary humeri are known for Percymygale n. gen. making comparisons difficult. However the muzzle development in Percymygale and Myxomygale suggests that Myxomygale was perhaps a better burrower than Percymygale.

http://www.zoobank.org/urn:lsid:zoobank.org:pub:E0BDC0FC-ABA2-4A84-AE76-06B3433B432E

http://www.zoobank.org/urn:lsid:zoobank.org:act:17E4DD37-24A4-4C7A-A7FEB421CF90F89C

Keywords:

• Talpidae
• Myxomygale
• Percymygale n. gen.
• Europe
• Oligocene/Miocene
• systematic

Acknowledgements

This paper is dedicated to the late Prof. Percy M. Butler in recognition of his exceptionally long and huge contribution to the vertebrate paleontology. Many thanks are due to the organizers for inviting us to contribute to this volume. Finally we want to thank P. David Polly and Reinhard Ziegler for their valuable comments that were most helpful to improve our manuscript.