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  • 标题:A new type of colony in Silurian (upper Wenlock) retiolitid graptolite Spinograptus from Poland
  • 本地全文:下载
  • 作者:ANNA KOZŁOWSKA ; KINGA DOBROWOLSKA ; DENIS E.B. BATES
  • 期刊名称:Acta Palaeontologica Polonica
  • 印刷版ISSN:0567-7920
  • 电子版ISSN:1732-2421
  • 出版年度:2013
  • 卷号:58
  • 期号:1
  • 页码:85-92
  • DOI:10.4202/app.2011.0020
  • 语种:English
  • 出版社:Institute of Paleobiology PAS
  • 摘要:The new retiolitid species, Spinograptus tubothecalis, is described from the Colonograptus praedeubeli and C. deubeli biozones from two localities in Poland: a borehole on the East European Platform and the Holy Cross Mountains. This was a recovery phase after the severe Silurian Cyrtograptus lundgreni Event. The new species has a unique, previously undescribed form of finite rhabdosome. Unlike the species Spinograptus reticulolawsoni and S. lawsoni, in which the finite rhabdosomes taper distally, its rhabdosome is parallel-sided with the two distal thecae developed as isolated tubes without genicular processes, with a small appendix between them. The new species also has preserved membranes of the sicula, thecae and ancora sleeve, similar to a few species of Spinograptus from the lower Homerian. Spinograptus tubothecalis, like Spinograptus clathrospinosus and S. spinosus, has paired reticulofusellar genicular processes on the pre-thecal ventral orifices, similar to but shorter than thecal processes. Transverse rods, a rare character in post-Cyrtograptus lundgreni Event retiolitids occur in the new species in rudimentary form.
  • 关键词:Graptoloidea;Retiolitidae;Spinograptus;finite colony;Silurian;Poland
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