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IRMNG taxon detailsChasmataspidida †
marine,
fossil only
Not documented
Taxonomic remark Previously included in Xiphosura. Lamsdell, 2012 states: Xiphosura sensu stricto is itself the sister group to a clade...
Taxonomic remark Previously included in Xiphosura. Lamsdell, 2012 states: Xiphosura sensu stricto is itself the sister group to a clade named Planaterga nom. nov. consisting of bunodids, pseudoniscids, chasmataspidids, eurypterids, and arachnids, a group defined at its base by the loss of the distinctive axial and subaxial nodes found on other synziphosurines. Chasmataspidids, eurypterids and arachnids are further defined in their ground plan by the possession of a 13-segmented opisthosoma (although this is then reduced in arachnids) and form a monophyletic clade, which is here named Dekatriata nom. nov. [details]
IRMNG (2023). Chasmataspidida †. Accessed at: https://www.irmng.org/aphia.php?p=taxdetails&id=10965 on 2025-03-09
Date action by
additional source
Lamsdell, J. C. (2012). Revised systematics of Palaeozoic 'horseshoe crabs' and the myth of monophyletic Xiphosura. <em>Zoological Journal of the Linnean Society.</em> 167(1): 1-27., available online at https://doi.org/10.1111/j.1096-3642.2012.00874.x [details]
taxonomy source The Paleobiology Database (2023 version). , available online at http://www.paleobiodb.org [details] name verified source The Paleobiology Database (2023 version). , available online at http://www.paleobiodb.org [details] current name source The Paleobiology Database (2023 version). , available online at http://www.paleobiodb.org [details] Unreviewed
Taxonomic remark Previously included in Xiphosura. Lamsdell, 2012 states: Xiphosura sensu stricto is itself the sister group to a clade named Planaterga nom. nov. consisting of bunodids, pseudoniscids, chasmataspidids, eurypterids, and arachnids, a group defined at its base by the loss of the distinctive axial and subaxial nodes found on other synziphosurines. Chasmataspidids, eurypterids and arachnids are further defined in their ground plan by the possession of a 13-segmented opisthosoma (although this is then reduced in arachnids) and form a monophyletic clade, which is here named Dekatriata nom. nov. [details]
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