THE OLDEST HORSESHOE CRAB: A NEW XIPHOSURID FROM LATE ORDOVICIAN KONSERVAT‐LAGERSTÄTTEN DEPOSITS, MANITOBA, CANADA

@article{Rudkin2008THEOH,
  title={THE OLDEST HORSESHOE CRAB: A NEW XIPHOSURID FROM LATE ORDOVICIAN KONSERVAT‐LAGERST{\"A}TTEN DEPOSITS, MANITOBA, CANADA},
  author={David M Rudkin and Graham A. Young and Godfrey S. Nowlan},
  journal={Palaeontology},
  year={2008},
  volume={51}
}
Abstract:  A remarkable new fossil horseshoe crab, Lunataspis aurora gen. et sp. nov., from recently discovered Upper Ordovician (c. 445 Ma) shallow marine Konservat‐Lagerstätten deposits in Manitoba (Canada), is characterized by fusion of opisthosomal tergites into two sclerites. A broad mesosoma of six or seven fused segments, followed by a narrow metasoma of three reduced segments, represents an advanced transitional condition in the development of the xiphosurid thoracetron. Lunataspis… 
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EVIDENCE FOR SUBAERIAL ACTIVITY OF EUPROOPS DANAE (MEROSTOMATA, XIPHOSURIDA)
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