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A chasmataspidid affinity for the putative xiphosuran Kiaeria Størmer, 1934

  • James C. LamsdellEmail author
Short Communication


The putative xiphosuran Kiaeria Størmer, 1934, from the Late Silurian (Ludlow) of Ringerike, Norway, is redescribed from the holotype and only known specimen as a chasmataspidid chelicerate arthropod. Morphological features such as the presence of a fused buckler of three opisthosomal segments clearly indicate a chasmataspidid affinity, while the size of Kiaeria, along with the occurrence of a raised axial region and expanded anterior articulation, suggest a close phylogenetic relationship to the Ordovician Chasmataspis. As such, Kiaeria represents the first indication that the Chasmataspis-type chasmataspidid morphology persisted alongside the radiation of diploaspidids. This is also only the third chasmataspidid species recorded from the Silurian.


Chasmataspidida Chelicerata Kiaeria Kiaeritia Ringerike 



I thank Hans Nakrem (PMO) for providing images of Kiaeria, and Kathy Hollis (NMNH) for facilitating loans of the Chasmataspis material. I am especially grateful to Jason Dunlop (Berlin) and Mike Reich (Munich) for detailed and invaluable reviews that helped resolve the taxonomic situation of Kiaeria.


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Copyright information

© Paläontologische Gesellschaft 2019

Authors and Affiliations

  1. 1.Department of Geology and GeographyWest Virginia UniversityMorgantownUSA

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