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  • 标题:Silurian synziphosurine horseshoe crab Pasternakevia revisited
  • 本地全文:下载
  • 作者:WIESŁAW KRZEMIŃSKI ; EWA KRZEMIŃSKA ; DARIUSZ WOJCIECHOWSKI
  • 期刊名称:Acta Palaeontologica Polonica
  • 印刷版ISSN:0567-7920
  • 电子版ISSN:1732-2421
  • 出版年度:2010
  • 卷号:55
  • 期号:1
  • 页码:133-139
  • DOI:10.4202/app.2008.0074
  • 语种:English
  • 出版社:Institute of Paleobiology PAS
  • 摘要:The synziphosurine horseshoe crab Pasternakevia was until now known only from a single specimen. Herein we describe three new specimens from the outcrop close to the type locality of monotypic P. podolica that show several features that were unknown or only assumed in this genus. These characters include: a smooth surface of the carapace; an opisthosoma composed of ten segments, the first one being a microtergite (strongly reduced first opisthosomal segment usually hidden under the carapace), two or three last segments fused into a metasoma, and the telson. Pasternakevia is included in Bunodidae due to a hypertrophied tergite 2, but it is linked to the Pseudoniscidae by the shape of the opisthosoma.
  • 关键词:Arthropoda;Xiphosura;Bunodidae;Pasternakevia;microtergite;phylogeny;Silurian;Ukraine
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