Gill structure and relationships of the Triassic cycloid crustaceans

  title={Gill structure and relationships of the Triassic cycloid crustaceans},
  author={Jerzy Dzik},
  journal={Journal of Morphology},
  • J. Dzik
  • Published 1 December 2008
  • Biology
  • Journal of Morphology
Unusually well‐preserved fossils of a Halicyne‐like cycloid crustacean frequently occur in the early Late Triassic lacustrine clay bed at Krasiejów in Opole Silesia, southern Poland. Its gill‐like structures form a horseshoe‐shaped pair of units composed of numerous calcified blades with reverse U‐shaped cross‐section. Originally, these were parallel slits opening on the ventral surface of the carapace. Lobation of the posterior margin of the carapace, of unusually large mature size for the… 

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