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Communication Dans Un Congrès Année : 2023

The secret history of sea spiders (Arthropoda: Pycnogonida)

Romain Sabroux
  • Fonction : Auteur
Morena Nava
  • Fonction : Auteur
Gregory D. Edgecombe
  • Fonction : Auteur
Russell J. Garwood
  • Fonction : Auteur
Philip C. J. Donoghue
  • Fonction : Auteur
Derek J. Siveter
  • Fonction : Auteur
Derek E. G. Briggs
  • Fonction : Auteur
David J. Siveter
  • Fonction : Auteur
Mark D. Sutton
  • Fonction : Auteur
Laure Corbari
  • Fonction : Auteur
Alexandre Hassanin
  • Fonction : Auteur
Davide Pisani
  • Fonction : Auteur

Résumé

Sea spider fossils (Chelicerata: Pycnogonida) are restricted to eleven species sparsely distributed from the Silurian to the Jurassic. Their morphology and relationships to extant pycnogonids are poorly understood. To improve their description, nest them in the chelicerate phylogeny and decipher the timing of Pycnogonida’s evolution, we conducted a comprehensive reinvestigation of the sea spider fossil record. We studied approximately 60 fossils, published or new, from the KonservatLagerstätten of Herefordshire, UK (Silurian), the Hunsrück Slate, Germany (Devonian), La Voulte-sur-Rhône, France and Solnhofen, Germany (Jurassic). Using X-ray microtomography, Reflectance Transformation Imaging, serial grinding and microtopography, we illustrate the past diversities of Pycnogonida. We show that while Palaeozoic fossils exhibit a stunning diversity of forms and adaptations unmatched in extant species, Mesozoic fossils share the same body plan as extant sea spiders, suggesting they belong to the crown-group Pycnogonida, i.e. Pantopoda. By performing the first total-evidence phylogeny of Chelicerata including the eleven sea spider fossil species, we further support our taxonomic interpretations. We demonstrate that Mesozoic fossils are nested within extant families or superfamilies, while Palaeozoic species belong to the stem-group Pycnogonida. Finally, we date the phylogeny of Pycnogonida using both node-dating and tip-dating strategies and estimate the divergence time of major Pycnogonida lineages.

Domaines

Paléontologie
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Dates et versions

hal-04362834 , version 1 (23-12-2023)

Identifiants

  • HAL Id : hal-04362834 , version 1

Citer

Romain Sabroux, Morena Nava, Gregory D. Edgecombe, Russell J. Garwood, Philip C. J. Donoghue, et al.. The secret history of sea spiders (Arthropoda: Pycnogonida). The Palaeontological Association 67th Annual Meeting, The Palaeontological Association & University of Cambridge, Sep 2023, Cambridge, United Kingdom. ⟨hal-04362834⟩
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