Morphology and adaptation of the auricle in Soricidae (Lipotyphla)

Abstract

Shrews look rather similar at first sight, but a closer look reveals many different specializations according to different lifestyles. In this study, we took a closer look on the auricle of shrews. To reveal morphological adaptations, we analysed the inclination of the outer ear in relation to the nostril-eye-line, and its visibility. We could show that not only environmental cues have an influence on the shape of the outer ear, but there exist also differences at the subfamily level. We found a clear separation between Soricinae, Myosoricinae, and Crocidurinae concerning the visibility and the inclination of the auricle. Within the limits of a subfamily the auricle is modified due to behavioural and environmental constraints. Especially within Myosoricinae adaptations to a semi-fossorial life are well visible.