三尖角鯊屬學名Thrinacodus)為已滅絕板鰓亞綱基群演化支,屬於亮齒鯊類英語Phoebodontiformes[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英語Bear Gulch Limestone,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,分別屬於刺突鮫屬英語Harpagofututor鐮鰭鯊屬[3]

三尖角鯊屬
化石時期:法門期 - 謝爾普霍夫期 Famennian至Serpukhovian
復原圖
牙齒化石
科學分類 編輯
界: 動物界 Animalia
門: 脊索動物門 Chordata
綱: 軟骨魚綱 Chondrichthyes
亞綱: 板鰓亞綱 Elasmobranchii
演化支 亮齒鯊類 Phoebodontiformes
屬: 三尖角鯊屬 Thrinacodus
St. John and Worthen, 1875
  • Thrinacodus tranquillus Ginter, 2000
  • Thrinacodus gracia (Grogan & Lund, 2008)
  • Thrinacodus ferox (Turner, 1982)
  • Thrinacodus nanus St. John and Worthen, 1875
  • Thrinacodus bicuspidatus Ginter and Sun, 2007
  • Thrinacodus dziki Ginter et al. 2014
異名
  • Thrinacoselache Grogan & Lund, 2008

參考文獻

編輯
  1. ^ 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. 
  2. ^ 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. ^ 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. 
  4. ^ 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.