A review of the systematics of the sleeper shark genus Somniosus with redescriptions of Somniosus (Somniosus) antarcticus and Somniosus (Rhinoscymnus) longus (Squaliformes: Somniosidae)
A review of the systematics of the sleeper shark genus Somniosus with redescriptions of Somniosus (Somniosus) antarcticus and Somniosus (Rhinoscymnus) longus (Squaliformes: Somniosidae)
复制标题
睡鲨属系统学综述以及对南极睡鲨 (Somniosus) 和长睡鲨 (Rhinoscymnus) 的重新描述（角鲨目：睡鲨科）
DOI：
10.1007/s10228-004-0244-4
复制
发表时间：
2004
影响因子：
1.2
通讯作者：
L. Compagno
中科院分区：
文献类型：
--
作者：
K. Yano;J. Stevens;L. Compagno
过去对睡鲨属睡眠的治疗通常识别三种：小头睡鲨、太平洋睡鲨和安息睡鲨。根据形态计量学和分类，我们认为该属包括2个亚属(Somniosusus和Rhinoscymnus)和5个种。睡眠亚属与鼻塞亚属的不同之处在于，成年时要大得多，下巴有更多的牙列，钩状而不是叶状的真皮小齿，更多的螺旋瓣和脊椎数目，以及钙化程度较低的脊柱。SubgenusSomniosusincludesS.(Somniosus)microcephalusandS.(S.)pacificusof北半球和(S)南半球的南极洲。尽管南极睡眠已成为s的同义词。小头症和辨认的驴。和平在过去的文学中，它不同于以往的文学。小头金枪鱼的背部间隙较短，第一背鳍较后，背鳍较低，下颌部有较多的齿列，螺旋瓣数目较多，尾前椎骨较少。具有较短的鳃前长度、较低的背鳍、较多的螺旋瓣数和稍多的尾椎骨。SubgenusRhinoscymnusincludesS.(Rhinoscymnus)rostratusfrom位于北大西洋东部和地中海(高级同义词OFS。Buchotae)和(R.)long us来自西太平洋，Somniosus long us一直是s的代名词。但不同之处在于第二背鳍相对较长，眼睛稍大，齿排更低，螺旋瓣数量略高。南极熊(Somniosus(Somniosus))和北极熊(S.(Rhinoscymnus)Long us从太平洋被重新描述。提供了该物种的检索表和所有物种的地理分布。
Past treatments of the sleeper shark genusSomniosusgenerally recognize three species:S. microcephalus,S. pacificus, andS. rostratus.Based on morphometrics and meristics, we conclude that this genus includes two subgenera (SomniosusandRhinoscymnus) and five species. SubgenusSomniosusdiffers fromRhinoscymnusby being much larger when adult and in having more numerous tooth rows in the lower jaw, hooklike rather than leaf-shaped dermal denticles, more numerous spiral valve and vertebral counts, and a poorly calcified vertebral column. SubgenusSomniosusincludesS.(Somniosus)microcephalusandS.(S.)pacificusof the Northern Hemisphere andS.(S.)antarcticusof the Southern Hemisphere. AlthoughSomniosus antarcticushas been synonymized withS. microcephalusand identified asS. pacificusin past literature, it differs fromS. microcephalusin having a shorter interdorsal space, a more posterior first dorsal fin, lower dorsal fins, more numerous tooth rows in the lower jaw, more numerous spiral valve counts, and fewer precaudal vertebrae.Somniosus antarcticusalso differs fromS. pacificusby having a shorter prebranchial length, lower dorsal fins, more numerous spiral valve counts, and slightly more precaudal vertebrae. SubgenusRhinoscymnusincludesS.(Rhinoscymnus)rostratusfrom the eastern North Atlantic and Mediterranean Sea (senior synonym ofS. bauchotae) andS.(R.)longusfrom the western Pacific Ocean.Somniosus longushas been synonymized withS. rostratus, but differs in having a relatively longer second dorsal fin, a slightly larger eye, more lower tooth rows, and slightly higher spiral valve counts. BothSomniosus(Somniosus)antarcticusandS. (Rhinoscymnus)longusfrom the Pacific Ocean were redescribed. A key to the species and the geographical distribution of all species are provided.