Paleontological Institute and Museum, University of Zurich, Zurich, Switzerland.
Zofingen, Switzerland.
PeerJ. 2022 May 16;10:e13251. doi: 10.7717/peerj.13251. eCollection 2022.
The Swiss Upper Marine Molasse (OMM) documents a transgression event dated to around 21 to 17 million years in which dolphin and other vertebrate remains have been reported. We revised the whole cetacean (whales and dolphins) OMM assemblage available in main collections, focusing on the identification and interpretation of periotics (bone that contains the inner ear). Periotics are rare, but they provide the richest taxonomic information in the sample and hint to environmental associations. Micro-computerized tomography allowed the reconstruction of bony labyrinths for comparisons and environmental interpretations. Three families are represented by periotics: Kentriodontidae, Squalodelphinidae and Physeteridae. The cetacean taxonomic composition of the Swiss OMM reinforces biogeographical patterns reported for the Mediterranean and Paratethys during the Burdigalian at a regional scale and the Calvert cetacean fauna of the northwest Atlantic at oceanic scale.
瑞士上海洋摩拉阶(OMM)记录了一次海侵事件,时间约为 2100 万至 1700 万年前,有报道称在此期间发现了海豚和其他脊椎动物的遗骸。我们修订了主要收藏中现有的整个鲸目动物(鲸鱼和海豚) OMM 组合,重点是对耳骨(包含内耳的骨骼)的鉴定和解释。耳骨很罕见,但它们在样本中提供了最丰富的分类学信息,并暗示了与环境的关联。微计算机断层扫描允许重建骨骼迷路进行比较和环境解释。耳骨代表了三个科:Kentriodontidae、Squalodelphinidae 和 Physeteridae。瑞士 OMM 的鲸目动物分类组成加强了在地区尺度上报道的博迪格利亚时期地中海和副特提斯海以及北大西洋卡弗特鲸类动物群的生物地理模式。