海笔 (棘皮动物)

海笔(Cinctans)是一类已灭绝的棘皮动物化石只发现于中寒武纪[2][3],分布于欧洲北非摩洛哥[4]海笔的分类地位尚有争议,一般认为属于棘皮动物干群[2][3]其身体缺乏对称性,外观类似球拍,可分为两部分,分别为由不规则骨板构成的勺状萼(theca),以及后方延伸出的茎尾(stele)。[5]无柄和腕,肛门位于萼的同一侧。它们的生活方式可能类似现代的被囊动物,以鳃口滤食海水中的浮游生物和有机物颗粒为生。[2]

海笔纲
化石时期:苗岭世
产自捷克Trochocystites bohemicus化石,长15毫米
科学分类 编辑
界: 动物界 Animalia
门: 棘皮动物门 Echinodermata
亚门: 海扁果亚门 Homalozoa
纲: 海笔纲 Cincta
Jaekel, 1918
异名
  • 同柱纲 Homostelea Gill & Caster, 1960[1]

参考文献

  1. ^ Lefebvre, Bertrand; Derstler, Kraig; Sumrall, Colin D. A reinterpretation of the solutan Plasiacystis mobilis (Echinodermata) from the Middle Ordovician of Bohemia. Zoosymposia. 2012, 7: 287–306. doi:10.11646/zoosymposia.7.1.27. 
  2. ^ 2.0 2.1 2.2 Rahman, Imran A.; Zamora, Samuel. The oldest cinctan carpoid (stem-group Echinodermata), and the evolution of the water vascular system. Zoological Journal of the Linnean Society. 2009, 157 (2): 420–432. doi:10.1111/j.1096-3642.2008.00517.x . 
  3. ^ 3.0 3.1 Rahman, Imran A.; Zamora, Samuel; Falkingham, Peter L.; Phillips, Jeremy C. Cambrian cinctan echinoderms shed light on feeding in the ancestral deuterostome. Proceedings of the Royal Society B. 2015, 282 (1818). PMC 4650160 . PMID 26511049. doi:10.1098/rspb.2015.1964 . 
  4. ^ Zamora, Samuel; Lefebvre, Bertrand; Javier Álvaro, J.; Clausen, Sébastien; Elicki, Olaf; Fatka, Oldrich; Jell, Peter; Kouchinsky, Artem; Lin, Jih-Pai; Nardin, Elise; Parsley, Ronald; Rozhnov, Sergei; Sprinkle, James; Sumrall, Colin D.; Vizcaïno, Daniel; Smith, Andrew B. Cambrian echinoderm diversity and palaeobiogeography. Geological Society, London, Memoirs. 2013, 38 (1): 157–171. S2CID 130481550. doi:10.1144/M38.13. 
  5. ^ Jefferies, R. P. S. The solute Dendrocystites scoticus from the Upper Ordovician of Scotland and the ancestry of chordates and echinoderms. Palaeontology. 1990, 33 (3): 631–679.