三尖角鯊屬
三尖角鯊屬(學名:Thrinacodus)為已滅絕的板鰓亞綱基群演化支,屬於亮齒鯊類[1],生存於泥盆紀晚期至石炭紀晚期的全球海域,其模式種為Thrinacodus nanus[2],本屬大多數物種目前僅有發現牠們的三尖齒化石。原先被認為屬於尖喙鰻鯊屬(Thrinacoselache)的T. gracia,化石發現於謝爾普霍夫期時期的美國蒙大拿州熊谷石灰岩礦床,是迄今為止唯一發現保留有全身骨架的三尖角鯊屬物種。從化石上可以發現,T. gracia具有細長,與現存鰻魚類似的身體,體長約1米(3英尺3英寸),並具備同樣細長的吻突[3][4][1]。T. gracia的胃部內容物包含了甲殼類的殘骸以及小型軟骨魚綱的遺骸,分別屬於刺突鮫屬及鐮鰭鯊屬[3]。
三尖角鯊屬![]() | |
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復原圖 | |
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牙齒化石 | |
科学分类 ![]() | |
界: | 动物界 Animalia |
门: | 脊索动物门 Chordata |
纲: | 软骨鱼纲 Chondrichthyes |
亚纲: | 板鳃亚纲 Elasmobranchii |
演化支: | †亮齒鯊類 Phoebodontiformes |
属: | †三尖角鯊屬 Thrinacodus St. John and Worthen, 1875 |
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異名 | |
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參考文獻
编辑- ^ 1.0 1.1 Frey, Linda; Coates, Michael; Ginter, Michał; Hairapetian, Vachik; Rücklin, Martin; Jerjen, Iwan; Klug, Christian. The early elasmobranch Phoebodus: phylogenetic relationships, ecomorphology and a new time-scale for shark evolution. Proceedings of the Royal Society B: Biological Sciences. 2019-10-09, 286 (1912): 20191336. ISSN 0962-8452. PMC 6790773 . PMID 31575362. doi:10.1098/rspb.2019.1336.
- ^ Brett Roelofs, Milo Barham, Arthur J. Mory, Kate Trinajstics. Late Devonian and Early Carboniferous chondrichthyans from the Fairfield Group, Canning Basin, Western Australia. Palaeontologia Electronica. January 2016, 19 (1): 1-28. doi:10.26879/583.
- ^ 3.0 3.1 Grogan, Eileen D.; Lund, Richard. A basal elasmobranch, Thrinacoselache gracia n. gen and sp., (Thrinacodontidae, new family) from the Bear Gulch Limestone, Serpukhovian of Montana, USA. Journal of Vertebrate Paleontology. 2008, 28 (4): 970–988. S2CID 84735866. doi:10.1671/0272-4634-28.4.970.
- ^ Ginter, Michał; Turner, Susan. The middle Paleozoic Selachian genus Thrinacodus. Journal of Vertebrate Paleontology. 2010-12-02, 30 (6): 1666–1672. ISSN 0272-4634. S2CID 86058786. doi:10.1080/02724634.2010.520785.