Skeleton of a Cretaceous mammal from Madagascar reflects long-term insularity
Skeleton of a Cretaceous mammal from Madagascar reflects long-term insularity
复制标题
DOI：
10.1038/s41586-020-2234-8
复制
发表时间：
2020-04
期刊：
影响因子：
64.8
通讯作者：
D. Krause;D. Krause;S. Hoffmann;Yaoming Hu;J. Wible;G. Rougier;E. Kirk;J. Groenke;J. Groenke;R. Rogers;James B. Rossie;J. Schultz;A. Evans;W. Koenigswald;Lydia J. Rahantarisoa
中科院分区：
文献类型：
--
作者：
D. Krause;D. Krause;S. Hoffmann;Yaoming Hu;J. Wible;G. Rougier;E. Kirk;J. Groenke;J. Groenke;R. Rogers;James B. Rossie;J. Schultz;A. Evans;W. Koenigswald;Lydia J. Rahantarisoa
冈瓦那超大陆南部的中生代哺乳动物(哺乳动物及其近亲)的化石记录远远没有北部的劳拉西亚记录的那么广泛。在中生代哺乳动物中，冈氏亚纲是最鲜为人知的分支之一，以前只有一个头盖骨和孤立的颌骨和牙齿，，，-。因此，刚毛虫的解剖学、古生物学和系统发育关系仍然不清楚。在这里，我们报告了在马达加斯加白垩纪最晚时代(72.1-6600万年前)发现的一具有关节且保存完好的刚丹瑟龙骨架，我们将其归属于一新属和新种--Adalatherium hu.据我们所知，该标本是已发现的冈氏中生代哺乳动物中最完整的骨骼，包括唯一已知的冈氏中生代哺乳动物的颅后材料和牙齿上升支。包括新分类单元在内的系统发育分析将冈氏亚纲恢复为多瘤亚纲的姊妹群。这具骨架代表着冈德瓦南中生代哺乳动物中最大的形式之一，尤其值得注意的是，它展示了许多独特的特征，并结合了与兽类哺乳动物相似的特征。这种独特性与马达加斯加2000多万年来与世隔绝的血统历史相一致。
The fossil record of mammaliaforms (mammals and their closest relatives) of the Mesozoic era from the southern supercontinent Gondwana is far less extensive than that from its northern counterpart, Laurasia,. Among Mesozoic mammaliaforms, Gondwanatheria is one of the most poorly known clades, previously represented by only a single cranium and isolated jaws and teeth, , , –. As a result, the anatomy, palaeobiology and phylogenetic relationships of gondwanatherians remain unclear. Here we report the discovery of an articulated and very well-preserved skeleton of a gondwanatherian of the latest age (72.1–66 million years ago) of the Cretaceous period from Madagascar that we assign to a new genus and species,Adalatherium hui. To our knowledge, the specimen is the most complete skeleton of a Gondwanan Mesozoic mammaliaform that has been found, and includes the only postcranial material and ascending ramus of the dentary known for any gondwanatherian. A phylogenetic analysis including the new taxon recovers Gondwanatheria as the sister group to Multituberculata. The skeleton, which represents one of the largest of the Gondwanan Mesozoic mammaliaforms, is particularly notable for exhibiting many unique features in combination with features that are convergent on those of therian mammals. This uniqueness is consistent with a lineage history forA. huiof isolation on Madagascar for more than 20 million years.