中文题名 / Chinese title: 腔棘鱼揭示有颌脊椎动物头部肌肉的深时演化
英文题名 / English title: Coelacanths illuminate deep-time evolution of cranial musculature in jawed vertebrates.
作者 / Authors: Datovo A, Johnson G.
期刊 / Journal: Science Advances
年份 / Year: 2025
DOI: 10.1126/sciadv.adt1576
论文链接 / Article: https://doi.org/10.1126/sciadv.adt1576
摘要来源 / Abstract source: https://europepmc.org/article/MED/40305593

英文摘要原文 / Original English abstract
Coelacanths are rare fishes that occupy a key evolutionary position in the vertebrate tree of life. Despite being exhaustively studied, we found that a substantial part of the knowledge on their cranial musculature was mistaken. Eleven previously reported coelacanth "muscles" are nonexistent, while three previously unknown muscle subdivisions and connections are found. These findings markedly affect our understanding of the deep-time cranial evolution of jawed vertebrates (gnathostomes). Only 13% of the previously identified myological evolutionary novelties for the major gnathostome lineages proved to be accurate, but several new ones are proposed. We show that low, moderate, and high levels of cranial muscle innovation characterized the emergence of lobe-finned (sarcopterygian), cartilaginous (chondrichthyan), and ray-finned (actinopterygian) fishes, respectively. The novelties in the latter group resulted in the evolution of a second active mechanism for the expansion of the oropharyngeal cavity, which was probably crucial for the predominance of suction feeding versus bite feeding in extant actinopterygians.

摘要依据的主要发现 / Findings based on the abstract
重新检查腔棘鱼头部解剖后，研究排除了此前记载的十一块所谓肌肉，并发现三个被忽略的分区或连接。这些同源关系修订改变了主要有颌脊椎动物谱系肌肉创新的重建结果。
Re-examination of coelacanth cranial anatomy rejects eleven previously reported muscles and identifies three overlooked subdivisions or connections. Revising these homologies changes inferred patterns of muscle innovation across major jawed-vertebrate lineages.

摘要依据的结论 / Conclusions based on the abstract
准确识别软组织同源关系是重建摄食演化的基础；辐鳍鱼类表现出尤为广泛的头部肌肉创新。
Accurate soft-tissue homology is essential for reconstructing feeding evolution; ray-finned fishes show especially extensive cranial muscular innovation.

可用全文文件 / Available full-text files
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