云南曲靖早泥盆世辐纹鱼类一新属

doi:10.19615/j.cnki.2096-9899.260908

摘要/Abstract

摘要：

记述了发现于中国云南曲靖下泥盆统洛赫考夫阶(西屯组)的节甲鱼类(有颌类干群，盾皮鱼纲)一新属——爨鱼(Cuanyu gen. nov.), 包括模式种刘氏爨鱼(Cuanyu liui gen. et sp. nov.)及其未定种(Cuanyu sp.)。新属具有与其他辐纹鱼类相似的特征，包括颅顶甲骨片的排列方式、表面纹饰和感觉沟模式。此外，新属具有辐纹鱼科的鉴定特征——愈合的眶前片，但其颅顶甲后缘的深凹等特征明显区别于其他辐纹鱼科成员。系统发育分析支持爨鱼属于辐纹鱼科，与斯氏鱼(Szelepis)构成姐妹群。作为目前所知最古老的节甲鱼类之一，爨鱼揭示了早期节甲鱼类的多样性，并为早期节甲鱼类特征演化提供了重要信息。

关键词: 云南曲靖, 下泥盆统, 辐纹鱼科, 节甲鱼目, 系统学

Abstract:

Here we describe new arthrodires (stem-Gnathostomata, Placodermi), Cuanyu liui gen. et sp. nov., and Cuanyu sp., from the Lochkovian (Xitun Formation, Lower Devonian) of Qujing, Yunnan, southwestern China. The new genus resembles other actinolepid arthrodires in the general arrangement of the skull roof plates, the ornamentation, and the sensory line pattern. Furthermore, it displays a single fused preorbital plate, a diagnostic feature of the family Actinolepidae. Cuanyu differs from other members of the Actinolepidae in possessing a deeply embayed posterior margin of the skull roof. The phylogenetic analysis supports its position within a monophyletic Actinolepidae, as the sister group of Szelepis. As one of the earliest arthrodires, Cuanyu is informative in revealing the character transformation in the early evolution of this diverse group of jawed vertebrates.

Key words: Qujing, Yunnan, Lower Devonian, Actinolepidae, Arthrodira, phylogeny

中图分类号:

Q915.862

文源, 朱敏, 薛钦元, 李强, 朱幼安. 云南曲靖早泥盆世辐纹鱼类一新属. 古脊椎动物学报, 2026, 64(4): 301-316.

WEN Yuan, ZHU Min, XUE Qin-Yuan, LI Qiang, ZHU You-An. New actinolepid arthrodires from the Lower Devonian of Qujing, Yunnan, southwestern China. Vertebrata Palasiatica, 2026, 64(4): 301-316.

图/表 6

Fig. 1 Photographs (A, C) and line drawings (B, D) of the holotype of Cuanyu liui gen. et sp. nov. from the Lower Devonian (upper Lochkovian) Xitun Formation of Qujing, Yunnan A, B. the skull roof in dorsal view with part of the neurocranium exposed (IVPP V33795a); C, D. external mold of the skull roof (V33795b). Scale bars equal 5 mm

Fig. 2 Photographs (A, C) and line drawings (B, D) of Cuanyu liui gen. et sp. nov. from the Lower Devonian (upper Lochkovian) Xitun Formation of Qujing, Yunnan A, B. the skull roof in dorsal view with part of the neurocranium exposed (IVPP V33796a); C, D. external mold of the skull roof (V33796b). Scale bars equal 5 mm

Fig. 3 Photographs (A, C) and line drawings (B, D) of Cuanyu liui gen. et sp. nov. from the Lower Devonian (upper Lochkovian) Xitun Formation of Qujing, Yunnan A, B. the neurocranium in dorsal view with part of the skull roof remained (IVPP V33801a); C, D. the skull roof in visceral view with a little external mold of the skull roof (V33801b). Scale bars equal 5 mm

Fig. 4 Photograph (A) and line drawing (B) of Cuanyu sp., the skull roof in dorsal view with part of the neurocranium exposed (IVPP V33797), from the Lower Devonian (upper Lochkovian) Xitun Formation of Qujing, Yunnan Scale bar equals 5 mm

Fig. 5 Comparison of the profundus sensory lines in arthrodires A. Cuanyu liui gen. et sp. nov.; B. Szelepis yunnanensis, after Dupret et al., 2017; C. Kujdanowiaspis podolica, after Dupret, 2010; D. Erikaspis zychi, after Dupret et al., 2007; E. Bryantolepis brachycephala, from Denison, 1958; F. Heightingtonaspis anglica, from Dineley and Liu, 1984; G. Simblaspis cachensis, from Denison, 1958; H. Aleosteus eganensis, after Johnson, 2000. Not to scale

Fig. 6 Strict consensus tree of 42 most parsimonious trees, based on a character dataset with 77 characters and 42 taxa (tree length = 201, consistency index = 0.378, retention index = 0.703)

参考文献 44

[1]	Agassiz L, 1844. Monographie des poissons fossils du vieux grès rouge ou système dévonien (old red sandstone) des Îles britanniques et de russie. Neuchâtel: A Sonrel. 1-171
[2]	Bryant W L, Ruedemann R, 1934. The fish fauna of Beartooth Butte, Wyoming. Parts II and III. Proc Am Philos Soc, 73: 127-162
[3]	Cai C Y, Fang Z J, Li X X et al., 1994. New advance in the study of biostratigraphy of Lower and Middle Devonian marine-continental transitional strata in east Yunnan. Sci China Ser B, 24: 634-639
[4]	Cai J C, Sun H R, Zhao W J et al., 2024. The Early Devonian Xitun Vertebrate Fauna in South China inhabited a shallow marine environment with changing salinity. J Geol Soc, 2024: jgs2023-146
[5]	Denison R H, 1958. Early Devonian fishes from Utah: Part III. Arthrodira. Fieldiana Geol, 11(9): 461-551
[6]	Denison R H, 1978. Placodermi. Stuttgart: Gustav Fischer Verlag. 1-128
[7]	Dineley D L, Liu Y H, 1984. A new actinolepid arthrodire from the Lower Devonian of Arctic Canada. Palaeontology, 27: 875-888
[8]	Dupret V, 2010. Revision of the genus Kujdanowiaspis Stensiö, 1942 (Placodermi, Arthrodira, “Actinolepida”) from the Lower Devonian of Podolia (Ukraine). Geodiversitas, 32: 5-63 DOI URL
[9]	Dupret V, Zhu M, 2008. The earliest phyllolepid (Placodermi, Arthrodira) from the late Lochkovian (Early Devonian) of Yunnan (South China). Geol Mag, 145(2): 257-278 DOI URL
[10]	Dupret V, Goujet D, Mark-Kurik E, 2007. A new genus of placoderm (Arthrodira: ‘Actinolepida’) from the Lower Devonian of Podolia (Ukraine). J Vert Paleont, 27: 266-284 DOI URL
[11]	Dupret V, Zhu M, Wang J Q, 2009. The morphology of Yujiangolepis liujingensis (Placodermi, Arthrodira) from the Pragian of Guangxi (South China) and its phylogenetic significance. Zool J Linn Soc, 157: 70-82 DOI URL
[12]	Dupret V, Zhu M, Wang J Q, 2017. Redescription of Szelepis Liu, 1981 (Placodermi, Arthrodira), from the Lower Devonian of China. J Vert Paleont, 37(2): e1312422 DOI URL
[13]	Eastman C R, 1908. Devonian Fishes of Iowa. Des Moines: Iowa Geological Survey. 167-177
[14]	Goujet D F, 1973. Sigaspis, un nouvel arthrodire du Dévonien inférieur du Spitsberg. Palaeontogr Abt A, 143: 73-88
[15]	Goujet D F, 1975. Dicksonosteus, un nouvel arthrodire du Dévonien du Spitsberg remarques sur le squelette visceral des Dolichothoraci. In: Lehman J P ed. Problèmes actuels de Paléontologie-Evolution des Vertébrés. Paris: Colloques Internationaux du Centre National de la Recherche Scientifique. 81-99
[16]	Goujet D F, 1984. Les Poissons Placodermes du Spitsberg. Arthrodires Dolichothoraci de la Formation de Wood Bay (Dévonien inférieur). Paris: Editions du CNRS. 1-284
[17]	Gross W, 1937. Die Wirbeltiere des rheinischen Devons. Teil ii. Abhand Preuss Geol Landes, 176: 1-83
[18]	Gross W, 1940. Acanthodier und Placodermen aus Heterostius-Schichten Estlands und Lettlands. Ann Soc Reb Nat Invest Univ Tartuensis, 46: 12-99
[19]	Heintz A, 1929. Die Downtonischen und Devonischen Vertebraten von Spitsbergen. II, Acanthaspida. Oslo: Jacob Dybwad. 1-81
[20]	Heintz A, 1932. The structure of Dinichthys:a contribution to our knowledge of the Arthrodira. In: Gudger E W ed. The Bashford Dean Memorial Volume:Archaic Fishes. New York: American Museum of Natural History. 115-224
[21]	Johnson H, Elliott D K, Wittke J H, 2000. A new actinolepid arthrodire (Class Placodermi) from the Lower Devonian Sevy Dolomite, East-Central Nevada. Zool J Linn Soc, 129: 241-266 DOI URL
[22]	Liu Y H, 1979. On the arctolepid Arthrodira from Lower Devonian of Yunnan. Vert PalAsiat, 17(1): 23-34
[23]	Liu Y H, 1991. On a new petalichthyid, Eurycaraspis incilis gen. et sp. nov., from the Middle Devonian of Zhanyi, Yunnan. In: Chang M M, Liu Y H, Zhang G R eds. Early Vertebrates and Related Problems of Evolutionary Biology. Beijing: Science Press. 139-177
[24]	Maddison W P, Maddison D R, 2023. Mesquite: a modular system for evolutionary analysis. Version 3.81. http://www.mesquiteproject.org
[25]	Mark-Kurik E, 1973. Actinolepis (Arthrodira) from the Middle Devonian of Estonia. Palaeontogr Abt A, 143: 89-108
[26]	Mark-Kurik E, 1985. Actinolepis spinosa n. sp. (Arthrodira) from the Early Devonian of Latvia. J Vert Paleont, 5: 287-292 DOI URL
[27]	McCoy F, 1848. On some new fossil fishes from the Carboniferous Period. Ann Mag Nat Hist, 2: 1-10
[28]	Miles R S, 1971. The Holonematidae (placoderm fishes), a review based on new specimens of Holonema from the Upper Devonian of western Australia. Philos Trans R Soc London Ser B, 263: 101-234
[29]	Miles R S, 1973. An actinolepid arthrodire from the Lower Devonian Peel Sound Formation, Prince of Wales Island. Palaeontogr Abt A, 143: 109-118
[30]	Schmidt W, 1976. Der rest eines actinolepididen placodermen (Pisces) aus der Bohrung Bolland (Emsium, Belgien). Bruxelles: Service Géologique de Belgique. 1-23
[31]	Stensiö E A, 1963. Anatomical studies on the arthrodiran head. Part 1. Preface, geological and geographical distribution, the organization of the head in the Dolichothoraci, Coccosteomorphi and Pachyosteomorphi. Taxonomic appendix. K Sven Vetensk Handl, 9: 1-419
[32]	Sun H R, Gai Z K, Cai J C et al., 2022. Xitunaspis, a new eugaleaspid fish (Eugaleaspiformes, Galeaspida) from the Lower Devonian of Qujing, Yunnan. Vert PalAsiat, 60(3): 169-183
[33]	Swofford D L, 2003. PAUP: Phylogenetic analysis using parsimony ( and other methods), version 4.0b 10. Sinauer Associates, Sunderland, Massachusetts
[34]	Westoll T S, Miles R S, 1963. On an arctolepid fish from Gemünden. Trans R Soc Edinburgh Earth Sci, 7: 139-153
[35]	White E I, 1969. The deepest vertebrate fossil and other arctolepid fishes. Biol J Linn Soc, 1: 293-310 DOI URL
[36]	Woodward A S, 1891. Catalogue of the Fossil Fishes in the British Museum (Natural History) Part II. London: British Museum (Natural History). 1-567
[37]	Young G C, 1979. New information on the structure and relationships of Buchanosteus (Placodermi: Euarthrodira) from the Early Devonian of New South Wales. Zool J Linn Soc, 66: 309-352 DOI URL
[38]	Zhao W J, Zhu M, 2010. Siluro-Devonian vertebrate biostratigraphy and biogeography of China. Palaeoworld, 19: 4-26 DOI URL
[39]	Zhao W J, Wang N Z, Zhu M et al., 2011. Geochemical stratigraphy and microvertebrate assemblage sequences across the Silurian/Devonian transition in South China. Acta Geol Sin, 85(2): 340-353 DOI URL
[40]	Zhao W J, Zhang X L, Jia G D et al., 2021. The Silurian-Devonian boundary in East Yunnan (South China) and the minimum constraint for the lungfish-tetrapod split. Sci China Earth Sci, 64: 1-14 DOI
[41]	Zhu M, 2000. Catalogue of Devonian vertebrates in China, with notes on bioevents. Cour Forsch-Inst Senckenberg, 223: 373-390
[42]	Zhu M, Wang N Z, Wang J Q, 2000. Devonian macro- and microvertebrate assemblages of China. Cour Forsch-Inst Senckenberg, 223: 361-372
[43]	Zhu Y A, Lu J, Zhu M, 2019. Reappraisal of the Silurian placoderm Silurolepis and insights into the dermal neck joint evolution. R Soc Open Sci, 6(9): 191181 DOI URL
[44]	Zhu Y A, Li Q, Lu J et al., 2022. The oldest complete jawed vertebrates from the early Silurian of China. Nature, 609: 954-958 DOI