McIlroy D, Pasinetti G, Pérez-Pinedo D, McKean C, Dufour S C, Matthews J J, Menon L R, Nicholls R, Taylor R S
Department of Earth Sciences, Memorial University of Newfoundland, St. John's, NL A1C 5S7, Canada.
Department of Biology, Memorial University of Newfoundland, St. John's, NL A1C 5S7, Canada.
Life (Basel). 2024 Aug 30;14(9):1096. doi: 10.3390/life14091096.
The Ediacaran of eastern Newfoundland preserves the world's oldest known eumetazoan body fossils, as well as the earliest known record of fossilized muscular tissue. Re-examination of the holotype of the eight-armed in terms of its morphology, the arrangement of its muscle filament bundles, and hitherto undescribed aspects of its anatomy support its interpretation as a crown staurozoan. We also document several new fossils preserving muscle tissue with a different muscular architecture to , but with only four arms. This new material allows us to describe a new crown group staurozoan, gen. et sp. nov. This work confirms the presence of crown group medusozoan cnidarians of the Staurozoa in the Ediacaran of Newfoundland circa 565 Ma.
纽芬兰岛东部的埃迪卡拉纪保存着世界上已知最古老的真后生动物身体化石，以及最早的肌肉组织化石记录。对八臂的正模标本重新审视其形态、肌肉丝束的排列以及迄今未描述的解剖学特征，支持将其解释为冠群海盘车动物。我们还记录了几个新化石，它们保存着与不同肌肉结构的肌肉组织，但只有四条臂。这些新材料使我们能够描述一个新的冠群海盘车动物，新属新种。这项工作证实了约5.65亿年前在纽芬兰岛埃迪卡拉纪存在冠群水母亚门刺胞动物中的海盘车动物。
