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A new limulid genus from the Strelovec Formation (Middle Triassic, Anisian) of northern Slovenia

Published online by Cambridge University Press:  07 May 2019

Russell D. C. Bicknell Open the ORCID record for Russell D. C. Bicknell [Opens in a new window] ,
Jure Žalohar ,
Primož Miklavc ,
Bogomir Celarc ,
Matija Križnar  and
Tomaž Hitij
Russell D. C. Bicknell*
Affiliation:
Palaeoscience Research Centre, School of Environmental and Rural Science, University of New England, Armidale, 2351, Australia
Jure Žalohar
Affiliation:
T-TECTO, Koroška cesta 12, SI-4000 Kranj, Slovenia
Primož Miklavc
Affiliation:
Department of Geology, Faculty of Natural Sciences and Engineering, University of Ljubljana, Aškerčeva ceta 12, SI-1000 Ljubljana, Slovenia
Bogomir Celarc
Affiliation:
Geological Survey of Slovenia, Dimičeva ulica 14, SI–1000 Ljubljana, Slovenia
Matija Križnar
Affiliation:
Slovenian Museum of Natural History, Prešernova 20, SI-1000 Ljubljana, Slovenia
Tomaž Hitij
Affiliation:
Dental School, Faculty of Medicine, University of Ljubljana, Hrvatski trg 6, SI-1000 Ljubljana, Slovenia
*
*Author for correspondence: Russell D. C. Bicknell, Email: rdcbicknell@gmail.com
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Abstract

Horseshoe crabs are an archetypal chelicerate group with a fossil record extending back to Early Ordovician time. Although extensively studied, the group generally has a low diversity across the Phanerozoic Eonothem. Here, we expand the known diversity of true horseshoe crabs (Xiphosurida) by the description of a new taxon from the Middle Triassic Strelovec Formation of the Slovenian Alps. The mostly complete fossil is preserved as an external mould and assigned to the family Limulidae Zittel, 1881 as Sloveniolimulus rudkini, n. gen., n. sp. The use of landmark and semilandmark geometric morphometrics is explored to corroborate the systematic palaeontology and suggests that the new genus and species are valid. We also provide the first quantitative evidence for the extensive diversity of Triassic horseshoe crabs. We suggest that Triassic horseshoe crabs likely filled many ecological niches left vacant after the end-Permian extinction.

Keywords

TriassicStrelovec FormationXiphosuridahorseshoe crabLimulidaeSloveniolimulusSloveniageometric morphometrics
Type
Original Article
Information
Geological Magazine , Volume 156 , Issue 12 , December 2019 , pp. 2017 - 2030
Copyright
© Cambridge University Press 2019 

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