An earliest Triassic age for Tasmaniolimulus and comments on synchrotron tomography of Gondwanan horseshoe crabs

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dc.contributor.authorBicknell, RDCen_AU
dc.contributor.authorSmith, PMen_AU
dc.contributor.authorBrougham, Ten_AU
dc.contributor.authorBevitt, JJen_AU
dc.date.accessioned2024-10-04T00:12:42Zen_AU
dc.date.available2024-10-04T00:12:42Zen_AU
dc.date.issued2022-04-22en_AU
dc.date.statistics2024-10-04en_AU
dc.description.abstractConstraining the timing of morphological innovations within xiphosurid evolution is central for understanding when and how such a long-lived group exploited vacant ecological niches over the majority of the Phanerozoic. To expand the knowledge on the evolution of select xiphosurid forms, we reconsider the four Australian taxa:Austrolimulus fletcheri, Dubbolimulus peetae, Tasmaniolimulus patersoni, andVictalimulus mcqueeni. In revisiting these taxa, we determine that, contrary to previous suggestion,T. patersoniarose after the Permian and the origin of over-developed genal spine structures within Austrolimulidae is exclusive to the Triassic. To increase the availability of morphological data pertaining to these unique forms, we also examined the holotypes of the four xiphosurids using synchrotron radiation X-ray tomography (SRXT). Such non-destructive,in situimaging of palaeontological specimens can aid in the identification of novel morphological data by obviating the need for potentially extensive preparation of fossils from the surrounding rock matrix. This is particularly important for rare and/or delicate holotypes. Here, SRXT was used to emphasizeA. fletcheriandT. patersonicardiac lobe morphologies and illustrate aspects of theV. mcqueenithoracetronic doublure, appendage impressions, and moveable spine notches. Unfortunately, the strongly compactedD. peetaeprecluded the identification of any internal structures, but appendage impressions were observed. The application of computational fluid dynamics to high-resolution 3D reconstructions are proposed to understand the hydrodynamic properties of divergent genal spine morphologies of austrolimulid xiphosurids. 10.7717/peerj.13326 © 2022 Bicknell et al. Distributed under Creative Commons CC-BY 4.0en_AU
dc.description.sponsorshipThis research was supported by funding from a UNE Postdoctoral Research Fellowship (to Russell D.C. Bicknell and Tom Brougham), and an ANSTO research grant (AS1/IMBL/15769 to Russell D.C. Bicknell and Tom Brougham). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.en_AU
dc.format.mediumElectronic-eCollectionen_AU
dc.identifier.articlenumbere13326en_AU
dc.identifier.citationBicknell, R. D. C., Smith, P. M., Brougham, T., Bevitt, J. J. (2022). An earliest Triassic age for Tasmaniolimulus and comments on synchrotron tomography of Gondwanan horseshoe crabs. PeerJ 10:e13326: doi:10.7717/peerj.13326en_AU
dc.identifier.issn2167-8359en_AU
dc.identifier.journaltitlePeerJen_AU
dc.identifier.urihttp://dx.doi.org/10.7717/peerj.13326en_AU
dc.identifier.urihttps://apo.ansto.gov.au/handle/10238/15726en_AU
dc.identifier.volume10en_AU
dc.languageEnglishen_AU
dc.language.isoenen_AU
dc.publisherPeerJen_AU
dc.subjectMorphologyen_AU
dc.subjectAustraliaen_AU
dc.subjectEvolutionen_AU
dc.subjectPermian Perioden_AU
dc.subjectTomographyen_AU
dc.subjectArchaeological specimensen_AU
dc.subjectSynchrotron radiationen_AU
dc.subjectTriassic Perioden_AU
dc.titleAn earliest Triassic age for Tasmaniolimulus and comments on synchrotron tomography of Gondwanan horseshoe crabsen_AU
dc.typeJournal Articleen_AU
dcterms.dateAccepted2022-04-02en_AU
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