云南早泥盆世多鳃鱼类一新属——鸮甲鱼
收稿日期: 2025-11-03
网络出版日期: 2026-01-13
基金资助
国家自然科学基金(42572008);国家自然科学基金(92255301);国家自然科学基金(42362001);国家自然科学基金(42130209)
Asioaspis, a new genus of Polybranchiaspiformes (Galeaspida, stem-gnathostomes) from the Lower Devonian of Yunnan, China
Received date: 2025-11-03
Online published: 2026-01-13
描述了盔甲鱼亚纲多鳃鱼目一新属种，短耳鸮甲鱼(Asioaspis brachyotus gen. et sp. nov.)。材料采自云南省曲靖市面店水库附近的下泥盆统洛霍赫考夫阶西山村组。新属的特征包括：长卵形头甲，侧缘具锯齿；中背孔小且呈亚圆形；向侧向延伸的短耳状的角；腹环异常宽阔；鳃囊12对；头甲表面布满粗粒状瘤点(约3个/mm2)。其形态特征呈现出镶嵌组合模式，兼具最原始多鳃鱼目宽腹鱼属、进步型多鳃鱼类，甚至基干盔甲鱼类大庸鱼科的特征。系统发育分析表明，短耳鸮甲鱼是最原始的古木鱼科与其他进步型多鳃鱼类之间的中间类群。尽管新属与古木鱼科共同拥有宽阔的 “帽檐状” 腹环，但其他特征更接近进步型多鳃鱼类，尤其中背孔与成对眶孔并未像古木鱼科那样紧凑聚集于头甲顶部，而是彼此远离且靠近腹环边缘，这一特征与五窗鱼科、都匀鱼科及多鳃鱼科一致。这表明短耳鸮甲鱼无法像古木鱼科那样营半埋藏生活，而是与大多数盔甲鱼类一样营表层底栖的生活方式，代表了多鳃鱼目从半埋藏向表层底栖生活方式演化的过渡类型。
张睿睿 , 张宁 , 李强 , 朱敏 , 盖志琨 . 云南早泥盆世多鳃鱼类一新属——鸮甲鱼[J]. 古脊椎动物学报, 2026 , 64(2) : 137 -150 . DOI: 10.19615/j.cnki.2096-9899.260113
A new genus and species, Asioaspis brachyotus gen. et sp. nov. of Polybranchiaspiformes, is described from the Lower Devonian Lochkovian Xishancun Formation near Miandian Reservoir, Qujing City, Yunnan Province, China. The new genus is characterized by an elongated ovoid headshield with serrated lateral margins, a small subcircular median dorsal opening, short and laterally projecting cornual processes, an exceptionally broad ventral rim, 12 pairs of branchial fossae, and coarse granular tubercles (~3/mm²). It displays a mosaic of characters of the most primitive polybranchiaspiform (Platylomaspis), derived Polybranchiaspiformes, and even the basal members of the galeaspid family Dayongaspidae. Phylogenetic analysis resolves A. brachyotus as an intermediate taxon between the most primitive Gumuaspidae and other derived Polybranchiaspiformes. Although A. brachyotus also shares the broad ham-brim-like ventral rim with the Gumuaspidae, its other characters are more like other derived Polybranchiaspiformes. In particular, its median dorsal opening and paired orbital openings are not highly close-set on the top of the headshield as in the Gumuaspidae, but rather significantly separated from each other and close to the margin of the ventral rim as in the Pentathyraspidae, Duyunolepididae, and Polybranchiaspidae. These proportions indicate that it was unlikely to have lived a semi-infaunal lifestyle and are more consistent with the epibenthic habit typical of most galeaspids, representing an evolutionary transition from the semi-infaunal benthic to epibenthic lifestyle within Polybranchiaspiformes.
| [1] | Donoghue P C J, Forey P L, Aldridge R J, 2000. Conodont affinity and chordate phylogeny. Biol Rev Camb Philos Soc, 75: 191-251 |
| [2] | Fan D J, Liu Z H, 1995. Sedimentary environment of the Late-Silurian to the early Early-Devanian in Quqing, East Yunnan Province. J Ocean Univ Qingdao, 25: 239-246 |
| [3] | Fang R S, Jiang N R, Fan J C et al., 1985. The Middle Silurian and Early Devonian Stratigraphy and Palaeontology in Qujing District, Yunnan. Kunming: Yunnan People’s Publishing House. 1-171 |
| [4] | Gai Z K, Zhu M, 2012. The origin of the vertebrate jaw: intersection between developmental biology-based model and fossil evidence. Chinese Sci Bull, 57: 3819-3828 |
| [5] | Gai Z K, Zhu M, 2017. Evolutionary History of Agnathans and Their Fossil Records in China. Shanghai: Shanghai Scientific & Technical Publishers. 1-314 |
| [6] | Gai Z K, Donoghue P C J, Zhu M et al., 2011. Fossil jawless fish from China foreshadows early jawed vertebrate anatomy. Nature, 476: 324-327 |
| [7] | Gai Z K, Zhu M, Jia L T et al., 2015. A streamlined jawless fish (Galeaspida) from the Lower Devonian of Yunnan, China and its taxonomic and paleoecological implications. Vert PalAsiat, 53: 93-109 |
| [8] | Gai Z K, Lu L W, Zhao W J et al., 2018. New polybranchiaspiform fishes (Agnatha: Galeaspida) from the Middle Palaeozoic of China and their ecomorphological implications. PLoS One, 13: e0202217 |
| [9] | Gai Z K, Li Q, Ferron H G et al., 2022a. Galeaspid anatomy and the origin of vertebrate paired appendages. Nature, 609: 959-963 |
| [10] | Gai Z K, Zhu M, Ahlberg P E et al., 2022b. The evolution of the spiracular region from jawless fishes to tetrapods. Front Ecol Evol, 10: 887172 |
| [11] | Gai Z K, Lin X H, Shan X R et al., 2023. Postcranial disparity of galeaspids and the evolution of swimming speeds in stem-gnathostomes. Nat Sci Rev, 10(7): nwad050 |
| [12] | Gai Z K, Zhu M,Donoghue P C J et al. 2025. The Galeaspida and New Fossil Records in China. Shanghai: Shanghai Scientific & Technical Publishers. 1-221 |
| [13] | Goloboff P A, Catalano S A, 2016. TNT version 1.5, including a full implementation of phylogenetic morphometrics. Cladistics, 32: 221-238 |
| [14] | Keating J N, Donoghue P C J, 2016. Histology and affinity of anaspids, and the early evolution of the vertebrate dermal skeleton. Proc R Soc B: Biol Sci, 283: 20152917 |
| [15] | Lin X H, Zan C Y, Gai Z K et al., 2025. Deanaspis, a new genus of Galeaspida (jawless stem Gnathostomata) from the Silurian of Jiangxi, China, and its evolutionary implications. J Syst Palaeont, 23: 2460479 |
| [16] | Liu Y H, 1965. New Devonian Agnathans of Yunnan. Vert PalAsiat, 9: 125-134 |
| [17] | Liu Y H, 1975. Lower Devonian Agnathans of Yunnan and Sichuan. Vert PalAsiat, 13: 202-216 |
| [18] | Liu Y H, Gai Z K, Zhu M, 2018. New findings of galeaspids (Agnatha) from the Lower Devonian of Qujing, Yunnan, China. Vert PalAsiat, 56: 1-15 |
| [19] | Ma X P, Liao W H, Wang D M, 2009. The Devonian system of China, with a discussion on sea-level change in South China. Geol Soc Lond Spec Publ, 314: 241-262 |
| [20] | Maddison W P, Maddison D R, 2019. Mesquite: a modular system for evolutionary analysis. Version 3.61. http://mesquiteproject.org |
| [21] | Meng X Y, Zhu M, Gai Z K, 2021. Redescription of Nochelaspis maeandrine, the largest eugaleaspiform from the Lower Devonian of Qujing, Yunnan. Vert PalAsiat, 59: 257-272 |
| [22] | Pan J, 1992. New Galeaspids (Agnatha) from the Silurian and Devonian of China. Beijing: Geological Publishing House. 1-77 |
| [23] | Pan J, Zeng X Y, 1985. Dayongaspidae, a new family of Polybranchiaspiformes (Agnatha) from early Silurian of Hunan, China. Vert PalAsiat, 23: 207-213 |
| [24] | Sansom R S, Freedman K I M, 2010. Taphonomy and affinity of an enigmatic Silurian vertebrate, Jamoytius kerwoodi White. Palaeontology, 53: 1393-1409 |
| [25] | Shan X R, Zhu M, Li Q et al., 2024. A taxonomical revision of ‘Dongfangaspis qujingensis’ from the Lower Devonian of Qujing, Yunnan Province. Vert PalAsiat, 62: 85-98 |
| [26] | Shang W G, Wang M W, 2000. Application of sequence stratigraphical theory to the correlation: taking the Lower and Middle Devonian of eastern Yunnan for example. J Stratigr, 24: 156-162 |
| [27] | Si C D, Gai Z K, Zhao W J, 2015. A new species of Siyingia from the Lower Devonian Xishancun Formation of Qujing, Yunnan. Vert PalAsiat, 53: 1-13 |
| [28] | Wang N Z, Wang J Q, 1982. A new Agnatha and its sensory systematic variation. Vert PalAsiat, 20: 276-281 |
| [29] | Zhang Y M, Li X T, Shan X R et al., 2024. The first galeaspid fish (stem-gnathostomata) from the Silurian Xiushan formation of Hunan Province, China. Hist Biol, 36(9): 1685-1696 |
| [30] | Zhang Y M, Shan X R, Lin X H et al., 2026. A new dayongaspid galeaspid from the Silurian of the Lower Yangtze region with implications for the biogeography and the evolution of the galeaspid key adaptations. J Earth Sci, 37: 303–316 |
| [31] | Zhao W J, Zhu M, 2010. Siluro-Devonian vertebrate biostratigraphy and biogeography of China. Palaeoworld, 19: 4-26 |
| [32] | Zheng R C, Zhang J Q, 1989. The tectonic framework and the evolution of lithofacies and paleogeography of Devonian in Eastern Yunnan and Southwestern Guizhou. J Chengdu Coll Geol, 16: 51-60 |
| [33] | Zhu M, 1992. Two new eugaleaspids, with a discussion on eugaleaspid phylogeny. Vert PalAsiat, 30: 169-184 |
| [34] | Zhu M, Wang N Z, Wang J Q, 2000. Devonian macro- and microvetebrate assemblages of China. Cour Forschungsinst Senck, 223: 361-372 |
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