Asterozoans from the Devonian of the Parana Basin, South Brazil
Asterozoans from the Devonian of the Parana Basin, South Brazil
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巴西南部巴拉那盆地泥盆纪的小行星
DOI：
10.1016/j.jsames.2019.102398
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发表时间：
2020-01-01
影响因子：
1.8
通讯作者：
Vega, Cristina Silveira
中科院分区：
文献类型：
--
作者：
Fraga, Malton Carvalho;Vega, Cristina Silveira
长期以来，由于在巴拉那盆地泥盆纪无脊椎动物中很少有星虫研究，因此对该区域类群的分类学、地学和古生态学的认识仍然非常有限。因此，本研究首次对蓬塔格罗萨组Jaguariaiva和Sao Domingos成员的小行星和蛇类化石进行了详细的鉴定和分类。结果，本文描述了四个种：Paranaster crucis 11 . gen., 11 . sp., Magnasterella darwin (Clarke, 1913) 11 . gen., Encrinaster pontis （Clarke, 1913）和marinix notatus 11 . sp.。也被提出。另一方面，通过对这些星形动物的地面学分析，结合沉积基质和相关化石组合的解释，揭示了巴拉那盆地泥盆纪的重要古环境细节。这些棘皮动物生活在极地气候和低沉积率的海洋平台上。但通常铰接的星形动物也支持了快速埋葬的重要事件。最后，本研究扩大了malvinokaffric棘皮动物的多样性，为Ponta Grossa组的古生态重建做出了贡献。
For a long time, as the asterozoan studies were rare among Devonian invertebrates of the Parana Basin, the knowledge about the taxonomy, taphonomy, and palaeoecology of this regional group remained extremely limited. Therefore, this research focuses for the first time on the detailed identification and classification of fossil asteroids and ophiuroids from the Jaguariaiva and Sao Domingos members of the Ponta Grossa Formation. As a result, four species are described herein, Paranaster crucis nov. gen., nov. sp., Magnasterella darwini (Clarke, 1913) nov. gen., Encrinaster pontis (Clarke, 1913), and Marginix notatus nov. sp. In addition, the Paranasteridae nov. fam. is also proposed. On the other hand, the taphonomic analysis of this asterozoans, together with the interpretation of sedimentary matrix and associated fossil assemblages, reveals important palaeoenvironment details from the Devonian of the Parana Basin. These echinoderms lived in a marine platform governed by a polar climate and low sedimentation rates. But the commonly articulated asterozoans also support important events of rapid burial. Finally, this research expands the diversity of malvinokaffric echinoderms, contributing to the palaeoecological reconstruction of the Ponta Grossa Formation.