| Falxcornus, a new genus of Tridensaspidae (Galeaspida, stem-Gnathostomata) from the Lower Devonian in Qujing, Yunnan, China | |
| Meng, Xinyuan1,2; Gai, Zhikun1,2 | |
| 2021-07-27 | |
| 发表期刊 | Historical Biology
 |
| 卷号 | 34期号:5页码:1-8 |
| 摘要 | A new genus and species of galeaspid, Falxcornus liui gen. et sp. nov., is described from the Xishancun Formation (Lochkovian, Lower Devonian) in Qujing, Yunnan, China. The new taxon displays a suite of diagnostic characters of the Eugaleaspiformes and strikingly resembles the tridensaspids Tridensaspis and Pterogonaspis in its sickle-like complex of cornual and inner cornual processes, leaf-like inner cornual processes, and median dorsal opening posteriorly placed level with the centre of the orbital opening, but clearly differs from these genera in lacking the rostral process and laterally projecting cornual processes. An extended phylogenetic analysis of the Galeaspida suggests that Falxcornus, Pterogonaspis and Tridensaspis form a monophyletic group as the family Tridensaspidae, and Falxcornus is resolved as sister to Pterogonaspis and Tridensaspis. Therefore, Falxcornus liui gen. et sp. nov. now represents the most primitive and oldest known tridensaspid fsh. Its subacute rostral margin and sickle-like complex of cornual and inner cornual processes likely represent an intermediate state of these highly specialised rostral and lateral projecting processes, respectively. The recurrent evolution of similar cephalic elaborations within the Galeaspida suggests that some galeaspids could manipulate water flow around their headshields to become active animals with higher manoeuvrability and versatility, similar to osteostracans. |
| DOI | 10.1080/08912963.2021.1952198 |
| URL | 查看原文 |
| 资助项目 | National Nature Science Foundation of China[41972006] ; National Nature Science Foundation of China[42072026] |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://119.78.100.205/handle/311034/22338 |
| 专题 | 古低等脊椎动物研究室 |
| 通讯作者 | Gai, Zhikun |
| 作者单位 | 1.Institute of Vertebrate Palaeontology and Paleoanthropology, Chinese Academy of Sciences, Beijing, China 2.University of the Chinese Academy of Sciences, Beijing, China 3.CAS Center for Excellence in Life and Paleoenvironment, Beijing, China |
| 推荐引用方式 GB/T 7714 | Meng, Xinyuan,Gai, Zhikun. Falxcornus, a new genus of Tridensaspidae (Galeaspida, stem-Gnathostomata) from the Lower Devonian in Qujing, Yunnan, China[J]. Historical Biology,2021,34(5):1-8. |
| APA | Meng, Xinyuan,&Gai, Zhikun.(2021).Falxcornus, a new genus of Tridensaspidae (Galeaspida, stem-Gnathostomata) from the Lower Devonian in Qujing, Yunnan, China.Historical Biology,34(5),1-8. |
| MLA | Meng, Xinyuan,et al."Falxcornus, a new genus of Tridensaspidae (Galeaspida, stem-Gnathostomata) from the Lower Devonian in Qujing, Yunnan, China".Historical Biology 34.5(2021):1-8. |
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