PATERIMITRA PYRAMIDALIS FROM SOUTH AUSTRALIA: SCLERITOME, SHELL STRUCTURE AND EVOLUTION OF A LOWER CAMBRIAN STEM GROUP BRACHIOPOD
PATERIMITRA PYRAMIDALIS FROM SOUTH AUSTRALIA: SCLERITOME, SHELL STRUCTURE AND EVOLUTION OF A LOWER CAMBRIAN STEM GROUP BRACHIOPOD
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DOI：
10.1111/pala.12072
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发表时间：
2014-03-01
期刊：
影响因子：
2.6
通讯作者：
Holmer, Lars E.
中科院分区：
文献类型：
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作者：
Larsson, Cecilia M.;Skovsted, Christian B.;Holmer, Lars E.
1986 年，根据来自南澳大利亚弗林德斯山脉下寒武统 Wilkawillina、Wirrapowie 和 Ajax 石灰岩的保存完好的材料，对 Tommotiid Paterimitrapyramalis Laurie 进行了重新描述。材料显示，Paterimitra Pyramalis 的骨片包括 3 种骨片形态类型（S1、S2 和 L）。详细的贝壳微观结构研究表明，其与腕足动物 Askepasma toddense 和 tommotiid Eccentrotheca helenia 具有惊人的相似性，这加强了 tommotiids 和腕足动物之间的进化联系。基于部分铰接的标本以及壳微结构和骨片形态与 Eccentrotheca 的相似性，Paterimitra Pyramidalis 被重建为管栖、表动物、无柄、滤食性动物，具有有机蒂状附着结构。所提出的骨片重建包括由一个 S1 和一个 S2 骨片组成的基底单元，以及排列在圆锥形管状结构中的未解决数量的 L 骨片。
The tommotiid Paterimitra pyramidalis Laurie, 1986, is redescribed based on well-preserved material from the lower Cambrian Wilkawillina, Wirrapowie and Ajax limestones of the Flinders Ranges, South Australia. The material shows that the scleritome of Paterimitra pyramidalis includes three sclerite morphotypes (S1, S2 and L). Detailed shell microstructure studies show striking similarities with both the paterinid brachiopod Askepasma toddense and the tommotiid Eccentrotheca helenia, which strengthens the suggested evolutionary link between tommotiids and brachiopods. Based on the partly articulated specimens and similarities in shell microstructure and sclerite morphology with Eccentrotheca, Paterimitra pyramidalis is reconstructed as a tube-dwelling, epifaunal, sessile, filter-feeder with an organic pedicle-like attachment structure. The proposed reconstruction of the scleritome comprises a basal unit composed of one S1 and one S2 sclerite, as well as an unresolved number of L sclerites lining a coniform tubular structure.