Hokkaido University Museum, Hakodate, Hokkaido, Japan ; Department of Geology, University of California Davis, Davis, California, United States of America.
School of Marine Science and Technology, Tokai University, Shimizu, Shizuoka, Japan.
PLoS One. 2014 Jan 21;9(1):e86205. doi: 10.1371/journal.pone.0086205. eCollection 2014.
This is the first known report on the skeletal and muscular systems, and the skin histology, of the pectoral fin of the rare planktivorous megamouth shark Megachasma pelagios. The pectoral fin is characterized by three features: 1) a large number of segments in the radial cartilages; 2) highly elastic pectoral fin skin; and 3) a vertically-rotated hinge joint at the pectoral fin base. These features suggest that the pectoral fin of the megamouth shark is remarkably flexible and mobile, and that this flexibility and mobility enhance dynamic lift control, thus allowing for stable swimming at slow speeds. The flexibility and mobility of the megamouth shark pectoral fin contrasts with that of fast-swimming sharks, such as Isurus oxyrhinchus and Lamna ditropis, in which the pectoral fin is stiff and relatively immobile.
这是首例关于罕见滤食性巨口鲨 Megachasma pelagios 的胸鳍骨骼和肌肉系统以及皮肤组织学的报告。胸鳍具有三个特征：1） 大量的辐射软骨段；2） 高度弹性的胸鳍皮肤；3） 胸鳍基部的垂直旋转铰链关节。这些特征表明，巨口鲨的胸鳍非常灵活和可移动，这种灵活性和移动性增强了动态升力控制，从而能够以较慢的速度稳定游泳。巨口鲨胸鳍的灵活性和移动性与快速游动的鲨鱼（如长尾鲨和灰鲭鲨）形成鲜明对比，后者的胸鳍坚硬且相对不可移动。
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