楔齒龍類










 

如何讀生物分類框
楔齒龍類
化石時期： 305–270 Ma

PreЄ

Є

O

S

D

C

P

T

J

K

Pg

N







晚賓夕法尼亞紀到中二疊紀
（不包含獸孔目、哺乳綱的狀況）


Pantelosaurus
Pantelosaurus


科學分類






























界：
動物界 Animalia
門：
 脊索動物門 Chordata


羊膜動物 Amniota
綱：
合弓綱 Synapsida
目：
盤龍目 Pelycosauria

（未分级）
真盤龍亞目 Eupelycosauria


楔齒龍類 Spenacodontia


楔齒龍類（学名：Spenacodontia）是個演化支，包括楔齒龍科與牠們所有後代（包括哺乳類）。牠們首次出現於晚賓夕法尼亞紀。共有衍徵包括：上頜骨的內部變厚、大型的犬齒型牙齒、前上頜骨的牙齒位在齒槽裡。所有其他（姐妹分類單元與更原始的物種）合弓動物演化支的牙齒都位在淺的齒槽裡。


基礎的楔齒龍類構成早期盤龍目到獸孔目祖先的演化過渡階段。有研究認為楔齒龍類是原始獸孔目動物。



分類學與種系發生學


以下分類是根據近年的兩個楔齒龍類研究[1][2]：


合弓綱 Synapsida




  • 盤龍目 PELYCOSAURIA

    • 真盤龍亞目 Eupelycosauria

      • 楔齒龍類 Sphenacodontia（包括並系群楔齒龍科）


        • 哈普托獸 Haptodus

        • Palaeohatteria

        • Pantelosaurus


        • 楔齒龍超科 Sphenacodontoidea

          • 楔齒龍科 Sphenacodontidae（狹義）


            • 深頜龍 Bathygnathus


            • 櫛棘龍 Ctenorhachis

            • Cutleria

            • Macromerion


            • 新龍 Neosaurus


            • 切齒龍 Secodontosaurus

            • ? Steppesaurus


            • 楔齒龍亞科 Sphenacodontinae


              • 隱獵龍 Cryptovenator


              • 櫛椎龍 Ctenospondylus


              • 異齒龍 Dimetrodon


              • 楔齒龍 Sphenacodon











  • 獸孔目 THERAPSIDA
    • 哺乳綱 Mammalia




參考資料





  1. ^ Jörg Fröbisch, Rainer R. Schoch, Johannes Müller, Thomas Schindler and Dieter Schweiss. A new basal sphenacodontid synapsid from the Late Carboniferous of the Saar-Nahe Basin, Germany (PDF). Acta Palaeontologica Polonica. 2011, 56 (1): 113–120. doi:10.4202/app.2010.0039. 


  2. ^ Benson, R.J. Interrelationships of basal synapsids: cranial and postcranial morphological partitions suggest different topologies. Journal of Systematic Paleontology. 2012,. in press. doi:10.1080/14772019.2011.631042. 


  • Michel Laurin and Robert Reisz, 1997, Autapomorphies of the main clades of synapsids - Tree of Life Web Project



外部連結


  • 合弓動物：楔齒龍類




物種識別信息


  • 維基數據: Q930410

  • 維基物種: Sphenacodontia

  • EoL: 13075926

  • Fossilworks: 95328



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