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The Triassic thylacocephalans from Slovenia: implications for their evolution and diversification

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1
Tomaž Hitij
  • Function : Author
Rok Gašparič
  • Function : Author
Jure Žalohar
  • Function : Author

Abstract

Thylacocephala is an enigmatic fossil euarthropod ingroup, often associated with Pancrustacea. Despite the remaining questions on their anatomy, thylacocephalans are characterized by key anatomical features: a folded shield enveloping most of the body, hypertrophied compound eyes, three pairs of raptorial appendages, a trunk made of eight to 22 segments bearing appendages, and eight pairs of gills. Known from at least the Silurian to the Cretaceous, it was during the Triassic that thylacocephalans were the most taxonomically diversified. Unknown until recently in the fossil record of Slovenia, many specimens of thylacocephalans have now been collected from various localities in the Julian and Kamnik-Savinja Alps. Dating back from the Anisian up to the Carnian, these localities display well-diversified thylacocephalan assemblages. Taxa already known from the Middle and Late triassic of Austria and Italy (Microcaris Pinna, 1974; Atropicaris Arduini and Brasca, 1984) have been recorded while new morphologies have also been identified. The new morphologies present typical characters of Jurassic representatives, especially a posterior notch and posterior spines. These new findings provide important insight into the diversity and geographic distribution of thylacocephalans during the Triassic but also into the morphological evolution of this puzzling group.
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Dates and versions

hal-03512596 , version 1 (05-01-2022)

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  • HAL Id : hal-03512596 , version 1

Cite

Thomas Laville, Tomaž Hitij, Rok Gašparič, Jure Žalohar, Marie-Béatrice Forel, et al.. The Triassic thylacocephalans from Slovenia: implications for their evolution and diversification. 65th Palaeontological AssociationAnnual Meeting, Dec 2021, Manchester, United Kingdom. ⟨hal-03512596⟩
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