{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,30]],"date-time":"2026-09-30T13:52:47Z","timestamp":1790776367939,"version":"4.1.0"},"reference-count":93,"publisher":"PeerJ","license":[{"start":{"date-parts":[[2022,11,4]],"date-time":"2022-11-04T00:00:00Z","timestamp":1667520000000},"content-version":"unspecified","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"University of New England Postdoctoral Fellowship"},{"name":"Karl Hirsch Memorial Grant"},{"name":"Australian Museum AMF\/AMRI Visiting Research Fellowship"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"abstract":"<jats:p>\n                    Abnormal trilobites present insight into how arthropods with fully biomineralised exoskeletons recovered from injuries, genetic malfunctions, and pathologies. Records of abnormal Silurian trilobites in particular show an abundance of specimens with teratologies and a limited record of injuries. Here we expand the record of abnormal Silurian trilobites by presenting seven new abnormal specimens of\n                    <jats:italic>Odontopleura (Sinespinaspis) markhami<\/jats:italic>\n                    from the early Silurian (Llandovery, Telychian) Cotton Formation, New South Wales. We use these specimens to illustrate novel evidence for asymmetric distribution of pleural thoracic spine bases. These abnormal bases likely reflect genetic complications, resulting in morphologies that would unlikely have aided the fitness of abnormal individuals. In considering records of malformed Silurian trilobites more broadly, we propose that the largest trilobites may have been prey at this time. This indicates a possible change in the trophic position of trilobites when compared to Cambrian and Ordovician palaeoecosystems.\n                  <\/jats:p>","DOI":"10.7717\/peerj.14308","type":"journal-article","created":{"date-parts":[[2022,11,4]],"date-time":"2022-11-04T04:41:56Z","timestamp":1667536916000},"page":"e14308","source":"Crossref","is-referenced-by-count":15,"title":["Examining abnormal Silurian trilobites from the Llandovery of Australia"],"prefix":"10.7717","volume":"10","author":[{"given":"Russell D.C.","family":"Bicknell","sequence":"first","affiliation":[{"name":"Palaeoscience Research Centre, School of Environmental and Rural Science, University of New England,  Armidale, New South Wales, Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Patrick M.","family":"Smith","sequence":"additional","affiliation":[{"name":"Department of Biological Sciences, Macquarie University, Sydney, New South Wales, Australia"},{"name":"Palaeontology Department, Australian Museum Research Institute, Sydney, New South Wales, Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"4443","published-online":{"date-parts":[[2022,11,4]]},"reference":[{"key":"10.7717\/peerj.14308\/ref-1","article-title":"Palaeontologica Scandinavica","volume-title":"Pars 1. 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