A chancelloriid-like metazoan from the early Cambrian Chengjiang Lagerstätte, China

نویسندگان

  • Xianguang Hou
  • Mark Williams
  • David J. Siveter
  • Derek J. Siveter
  • Sarah Gabbott
  • David Holwell
  • Thomas H. P. Harvey
چکیده

Nidelric pugio gen. et sp. nov. from the Cambrian Series 2 Heilinpu Formation, Chengjiang Lagerstätte, Yunnan Province, China, is an ovoid, sac-like metazoan that bears single-element spines on its surface. N. pugio shows no trace of a gut, coelom, anterior differentiation, appendages, or internal organs that would suggest a bilateral body plan. Instead, the sac-like morphology invites comparison with the radially symmetrical chancelloriids. However, the single-element spines of N. pugio are atypical of the complex multi-element spine rosettes borne by most chancelloriids and N. pugio may signal the ancestral chancelloriid state, in which the spines had not yet fused. Alternatively, N. pugio may represent a group of radial metazoans that are discrete from chancelloriids. Whatever its precise phylogenetic position, N. pugio expands the known disparity of Cambrian scleritome-bearing animals, and provides a new model for reconstructing scleritomes from isolated microfossils.

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عنوان ژورنال:

دوره 4  شماره 

صفحات  -

تاریخ انتشار 2014