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Volume 32 Issue 3
Jun 2021
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Weiping Zeng, Mark A. Purnell, Haishui Jiang, Muhui Zhang. Late Triassic (Norian) Conodont Apparatuses Revealed by Conodont Clusters from Yunnan Province, Southwestern China. Journal of Earth Science, 2021, 32(3): 709-724. doi: 10.1007/s12583-021-1459-2
Citation: Weiping Zeng, Mark A. Purnell, Haishui Jiang, Muhui Zhang. Late Triassic (Norian) Conodont Apparatuses Revealed by Conodont Clusters from Yunnan Province, Southwestern China. Journal of Earth Science, 2021, 32(3): 709-724. doi: 10.1007/s12583-021-1459-2

Late Triassic (Norian) Conodont Apparatuses Revealed by Conodont Clusters from Yunnan Province, Southwestern China

doi: 10.1007/s12583-021-1459-2
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  • Corresponding author: Haishui Jiang, jiangliuis@163.com
  • Received Date: 21 Nov 2020
  • Accepted Date: 19 Mar 2021
  • Publish Date: 01 Jun 2021
  • Almost all aspects of conodont research rely on a sound taxonomy based on comparative analysis. This is founded on hypotheses of homology which ultimately rest on knowledge of the location of elements in the apparatus. Natural assemblages—fossils that preserve the articulated remains of the conodont skeletal apparatus—provide our only direct evidence for element location, but very few are known from the Late Triassic. Here we describe fused clusters (natural assemblages) from the late Norian limestone beds of the Nanshuba Formation in Baoshan, Yunnan Province, southwestern China. Recurrent arrangements and juxtaposition of S and M elements in multiple clusters reveal the composition of the apparatus of Mockina and, probably, Parvigondolella. They indicate that these taxa had a standard 15 elements ozarkodinid apparatus, and provide new insights into the morphology of the elements occupying the P2, M and S locations of the apparatus. The apparatus comprised a single alate (hibbardelliform) S0 element, paired breviform digyrate (grodelliform) S1 and (enantiognathiform) S2 elements, paired bipennate (hindeodelliform) S3 and S4 elements, paired breviform digyrate (cypridodellifrom) M elements, paired, modified-angulate P2 elements (with reduced or lacking 'posterior' process) and segminiplanate (mockiniform and parvigondolelliform) P1 elements. Our results will allow testing of the hypothesis that Mockina, Parvigondolella and Misikella—critical taxa in Late Triassic biostratigraphy—are closely related and possessed morphologically similar elements in homologous locations.

     

  • Electronic Supplementary Materials : Supplementary materials, compressed 3D videos of the clusters are available in the online version of this article at https://doi.org/10.1007/s12583-021-1459-2.
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