腭方骨比较解剖学分析揭示肺鱼自接型头骨的递进式起源
收稿日期: 2026-01-13
网络出版日期: 2026-04-08
基金资助
国家自然科学基金(42302005);国家自然科学基金(92255301);国家重点研发计划(2025YFF0811700)
Stepwise formation of autostyly in lungfishes revealed by comparative analysis of palatoquadrate
Received date: 2026-01-13
Online published: 2026-04-08
自接型颌骨是肺鱼类头部骨骼的一个重要特征，但其起源演化尚未完全明晰。对肺鱼类干群三个重要代表——杨氏鱼(Youngolepis)、奇异鱼(Diabolepis)以及最早的真肺鱼古嵴鱼(Paleolophus)——的腭方骨及其关节结构进行了详细的比较解剖学研究，揭示了这一重要特征的递进式演化过程。杨氏鱼的腭方骨后部接近垂直，表明在自接型颌骨形成之前，其颌骨的力学功能已经发生重组。在奇异鱼中，颌骨连接结构进一步演化：腭方骨的自腭部分明显缩减，但保留了原始的眶下关节。古嵴鱼是最原始的真肺鱼类，也是具有肺鱼自接型颌骨的最早化石代表，其腭方骨与脑颅愈合，但尚未与侧联合骨完全融合。中、晚泥盆世的肺鱼进一步演化出强壮且与侧联合愈合的耳突，标志着自接型颌骨的最终形成。这些结果表明，肺鱼的自接型颌骨是在与食壳性取食相关的生物力学驱动下逐步演化形成的。
乔妥 , 刘城希 , 崔心东 , 朱敏 . 腭方骨比较解剖学分析揭示肺鱼自接型头骨的递进式起源[J]. 古脊椎动物学报, 2026 , 64(2) : 167 -182 . DOI: 10.19615/j.cnki.2096-9899.260408
Autostyly, defined by fusion of the palatoquadrate to the neurocranium and loss of the hyomandibula as a suspensory element, is a hallmark of lungfish cranial organization among sarcopterygians, yet its evolutionary origin remains incompletely understood. This study elucidates this transition through a detailed comparative analysis of the palatoquadrate and its articulations in three sequentially diverging stem dipnoans: Youngolepis, Diabolepis, and the earliest eudipnoan Paleolophus. Youngolepis exhibits a reoriented palatoquadrate, indicating functional reorganization of jaw mechanics prior to autostyly. In Diabolepis, reduction of the pars autopalatina and retention of a primitive suborbital articulation suggest further modification of jaw suspension. Paleolophus documents the earliest unambiguous autostyly, with direct palatoquadrate-neurocranial integration preceding complete fusion with the lateral commissure, along with an enlarged adductor fossa. Comparison with Middle and Late Devonian lungfishes indicates that full autostyly was achieved only after the development of a robust, integrated otic process. These results demonstrate that lungfish autostyly evolved stepwise, driven by increasing biomechanical demands associated with durophagous feeding.
Key words： Devonian; lungfish; autostyly; palatoquadrate; evolution
| [1] | Ahlberg P E, Smith M M, Johanson Z, 2006. Developmental plasticity and disparity in early dipnoan (lungfish) dentitions. Evol Dev, 8: 331-349 |
| [2] | Bartsch P, 1994. Development of the cranium of Neoceratodus forsteri, with a discussion of the suspensorium and the opercular apparatus in Dipnoi. Zoomorphology, 114(1): 1-31 |
| [3] | Bemis W E, Lauder G V, 1986. Morphology and function of the feeding apparatus of the lungfish, Lepidosiren paradoxa (Dipnoi). J Morphol, 187(1): 81-108 |
| [4] | Bernacsek G M, 1977. A lungfish cranium from the Middle Devonian of the Yukon Territory, Canada. Palaeontogr Abt A, 157: 175-200 |
| [5] | Brazeau M D, 2009. The braincase and jaws of a Devonian ‘acanthodian’ and modern gnathostome origins. Nature, 457: 305-308 |
| [6] | Campbell K S W, Barwick R E, 1982. The neurocranium of the primitive dipnoan Dipnorhynchus sussmilchi (Etheridge). J Vert Paleont, 2(3): 286-327 |
| [7] | Campbell K S W, Barwick R E, 1987. Paleozoic lungfishes - a review. In: Bemis WB, Burggren WW,Kemp N F eds. The Biology and Evolution of Lungfishes. J Morphol (Suppl 1, 1986). New York: Alan R Liss. 93-131 |
| [8] | Chang M M, 1982. The braincase of Youngolepis, a Lower Devonian Crossopterygian from Yunnan, south-western China. Ph. D thesis. Stockholm: Department of Geology, University of Stockholm. 1-113 |
| [9] | Chang M M, 1991a. Head exoskeleton and shoulder girdle of Youngolepis. In: Chang MM, Liu YH, Zhang G R eds. Early Vertebrates and Related Problems of Evolutionary Biology. Beijing: Science Press. 355-378 |
| [10] | Chang M M, 1991b. “Rhipidistians”, dipnoans, and tetrapods. In: Schultze HP, Trueb L eds. Origins of the Higher Groups of Tetrapods:Controversy and Consensus. New York: Cornell University Press. 3-28 |
| [11] | Chang M M, 1995. Diabolepis and its bearing on the relationships between porolepiforms and dipnoans. Bull Mus Natl Hist Nat, Sect C, 17(1-4): 235-268 |
| [12] | Chang M M, 2004. Synapomorphies and scenarios - more characters of Youngolepis betraying its affinity to the Dipnoi. In: ArratiaG, Wilson M VH, Cloutier R eds. Recent Advances in the Origin and Early Radiation of Vertebrates. München: Verlag Dr. Friedrich Pfeil. 665-686 |
| [13] | Chang M M, Smith M M, 1992. Is Youngolepis a porolepiform? J Vert Paleont, 12(3): 294-312 |
| [14] | Chang M M, Yu X B, 1981. A new crossopterygian, Youngolepis praecursor, gen. et sp. nov., from Lower Devonian of eastern Yunnan, China. Sci Sin, 24(1): 89-99 |
| [15] | Chang M M, Yu X B, 1984. Structure and phylogenetic significance of Diabolichthys speratus gen. et sp. nov., a new dipnoan-like form from the Lower Devonian of eastern Yunnan, China. Proc Linn Soc NSW, 107(3): 171-184 |
| [16] | Chang M M, Yu X B, 1987. A nomen novum for Diabolichthys Chang et Yu, 1984. Vert PalAsiat, 25: 79 |
| [17] | Clément G, Janvier P, 2004. Powichthys spitsbergensis sp. nov., a new member of the Dipnomorpha (Sarcopterygii, lobe-finned fishes) from the Lower Devonian of Spitsbergen, with remarks on basal dipnomorph anatomy. Foss Strata, 50: 92-112 |
| [18] | Cloutier R, Ahlberg P E, 1996. Morphology, characters, and the interrelationships of basal sarcopterygians. In: Stiasnny M LJ, Parenti LR, Johnson G D eds. Interrelationships of Fishes. San Diego: Academic Press. 445-479 |
| [19] | Cui X D, Friedman M, Qiao T et al., 2022. The rapid evolution of lungfish durophagy. Nat Commun, 13(1): 2390 |
| [20] | Denison R H, 1968a. Early Devonian lungfishes from Wyoming, Utah, and Idaho. Fieldiana Geol, 17(4): 353-413 |
| [21] | Denison R H, 1968b. The evolutionary significance of the earliest known lungfish Uranolophus. In: ?rvig T ed. Current Problems of Lower Vertebrate Phylogeney. Nobel Symposium 4. Stockholm: Almqvist and Wiksell.247-257 |
| [22] | Edgeworth F H, 1925. On the autostyly of dipnoi and amphibia. J Anat, 59: 225-264 |
| [23] | Forey P L, Gardiner B G, Patterson C, 1991. The lungfish, the coelacanth and the cow revisited. In: Schultze HP, Trueb L eds. Origins of the Higher Groups of Tetrapods:Controversy and Consensus. Ithaca: Cornell Publishing Associates. 145-172 |
| [24] | Fox H, 1965. Early development of the head and pharynx of Neoceratodus with a consideration of its phylogeny. J Zool, 146: 470-554 |
| [25] | Gardiner B G, 1984a. The relationship of placoderms. J Vert Paleont, 4(3): 379-395 |
| [26] | Gardiner B G, 1984b. The relationships of the palaeoniscid fishes, a review based on new specimens of Mimia and Moythomasia from the Upper Devonian of Western Australia. Bull Br Mus (Nat Hist) Geol, 37(4): 173-428 |
| [27] | Holmgren N, 1943. Studies on the head of fishes, Part IV. Acta Zool, 24: 1-188 |
| [28] | Janvier P, 1996. Early Vertebrates. Oxford: Clarendon Press. 1-393 |
| [29] | Jarvik E, 1952. On the fish-like tail in the ichthyostegid stegocephalians with descriptions of a new stegocephalian and a new crossopterygian from the Upper Devonian of East Greenland. Medd Gr?nl, 114(12): 1-90 |
| [30] | Jarvik E, 1963. The fossil vertebrates from East Greenland and their zoological importance. Experientia, 19: 1-6 |
| [31] | Jarvik E, 1972. Middle and Upper Devonian Porolepiformes from East Greenland with special reference to Glyptolepis groenlandica n. sp. and a discussion on the structure of the head in the Porolepiformes. Medd Gr?nl, 187(2): 1-307 |
| [32] | Jarvik E, 1980. Basic Structure and Evolution of Vertebrates, Vol. 1. London: Academic Press. 1-575 |
| [33] | Jessen H L, 1980. Lower Devonian Porolepiformes from the Canadian Arctic with special reference to Powichthys thorsteinssoni Jessen. Palaeontogr Abt A, 167: 180-214 |
| [34] | Maisey J G, 1980. An evaluation of jaw suspension in sharks. Am Mus Novit, 2706: 1-17 |
| [35] | Maisey J G, 2005. Braincase of the Upper Devonian shark Cladodoides wildungensis (Chondrichthyes, Elasmobranchii), with observations on the braincase in early chondrichthyans. Bull Am Mus Nat Hist, 288: 1-103 |
| [36] | Miles R S, 1965. Some features in the cranial morphology of acanthodians and the relationships of the Acanthodii. Acta Zool, 46: 233-255 |
| [37] | Miles R S, 1973. Relationships of acanthodians. In: Greenwood PH, Miles RS, Patterson C eds. Interrelationships of Fishes. London: Academic Press. 63-103 |
| [38] | Miles R S, 1977. Dipnoan (lungfish) skulls and the relationships of the group: a study based on new species from the Devonian of Australia. Zool J Linn Soc, 61(1-3): 1-328 |
| [39] | Panchen A L, Smithson T R, 1987. Character diagnosis, fossils and the origin of tetrapods. Biol Rev Camb Philos Soc, 62: 341-438 |
| [40] | Qiao T, Zhu M, 2010. Cranial morphology of the Silurian sarcopterygian Guiyu oneiros (Gnathostomata: Osteichthyes). Sci China-Earth Sci, 53(12): 1836-1848 |
| [41] | Qiao T, Cui X D, Zhao W J et al., 2026. A new fossil fish sheds light on the rapid evolution of early lungfishes. Curr Biol, 36: 1-9 |
| [42] | Reisz R R, Smith M M, 2001. Lungfish dental pattern conserved for 360 Myr. Nature, 411: 548 |
| [43] | Schaeffer B, 1981. The xenacanth shark neurocranium, with comments on elasmobranch monophyly. Bull Am Mus Nat Hist, 169(1): 1-66 |
| [44] | Schultze H P, 1987. Dipnoans as sarcopterygians. In:Bemis W E, Burggren W W, Kemp N E eds. The Biology and Evolution of Lungfishes. J Morphol (Suppl 1, 1986). New York: Alan R Liss. 39-74 |
| [45] | Schultze H P, Campbell K S W, 1987. Characterization of the Dipnoi, a monophyletic group. In: Bemis WE, Burggren WW,Kemp N E eds. The Biology and Evolution of Lungfishes. J Morphol (Suppl 1, 1986). New York: Alan R Liss. 25-37 |
| [46] | Thomson K S, Campbell K S W, 1971. The structure and relationships of the primitive Devonian lungfish - Dipnorhynchus sussmilchi (Etheridge). Bull Peabody Mus Nat Hist, 38: 1-109 |
| [47] | Yu X B, 1998. A new porolepiform-like fish, Psarolepis romeri, gen. et sp. nov. (Sarcopterygii, Osteichthyes) from the Lower Devonian of Yunnan, China. J Vert Paleont, 18(2): 261-274 |
| [48] | Zhu M, Schultze H P, 1997. The oldest sarcopterygian fish. Lethaia, 30(4): 293-304 |
| [49] | Zhu M, Yu X B, Janvier P, 1999. A primitive fossil fish sheds light on the origin of bony fishes. Nature, 397: 607-610 |
| [50] | Zhu M, Yu X B, Ahlberg P E, 2001. A primitive sarcopterygian fish with an eyestalk. Nature, 410: 81-84 |
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