Evolutionary Process from Mockina bidentata to Parvigondolella andrusovi: Evidence from the Pizzo Mondello Section, Sicily, Italy
Evolutionary Process from Mockina bidentata to Parvigondolella andrusovi: Evidence from the Pizzo Mondello Section, Sicily, Italy
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DOI：
10.1007/s12583-020-1362-2
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发表时间：
2021-05-07
影响因子：
3.3
通讯作者：
Rigo, Manuel
中科院分区：
文献类型：
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作者：
Du, Yixing;Onoue, Tetsuji;Rigo, Manuel
在演化的最后阶段，梳状牙形刺元素表现出明显的简单化和小型化趋势。这一阶段始于晚三叠世的诺里安晚期(Sevatian)，其中Mocina属向Parvilondolella的演化过程，特别是Mocina bientata与Parvilondolella andrusovi之间的演化过程是最重要的例子之一。自20世纪70年代初首次描述以来，帕维贡多拉在全球范围内都有报道。然而，最近有人提出，Parvilondolella属是Mocina属的生态地层形态模式，因此是受环境条件控制的表型，而不是一个独立的分类单元。在意大利西西里岛的Pizzo Mondello段，在不同的进化阶段发现了双齿分枝杆菌和分枝杆菌之间的过渡形式。我们利用氧化还原敏感元素(Mn、Fe、V、Cr和Ni)和来自生物成因三角洲O-18(PHOS)的海水温度调查了当时的海洋条件，以了解环境对Mocina和Parvilondolella系统发育演化的可能影响。地球化学和同位素分析结果表明，在Pizzo Mondello中Parvilondolella属的演化过程中，氧化还原条件和温度是稳定的，证实了Parvilondolella属是一个真正的类群，而不是一个表型。记述了一新种牙形刺，命名为Parvilondolella ciarapicae n.sp.这是第一次在这里描述。
During their last phase of evolution, the pectiniform conodont elements manifested an evident trend of simplification and miniaturization. This phase started from the late Norian (Sevatian) in the Late Triassic and the evolutionary process of genus Mockina to Parvigondolella, in particular between Mockina bidentata and Parvigondolella andrusovi, is one of the most significant examples. Parvigondolella has been reported worldwide since it was first described in the early 1970s. However, it has recently been suggested that genus Parvigondolella is an ecostratigraphic morphotype of genus Mockina, and thus a phenotype controlled by the environmental conditions, and not an independent taxon. In the Pizzo Mondello Section (Sicily, Italy), transitional forms between M. bidentata and P. andrusovi have been found at different evolutionary stages. We have investigated the oceanic conditions at the time by using redox-sensitive elements (Mn, Fe, V, Cr, and Ni) and seawater temperatures from biogenetic delta O-18(phos) to understand the possible environmental influences on the phylogenetic evolution between Mockina and Parvigondolella. The geochemical and isotope analyses indicate that the redox condition and temperature were stable during the evolution of genus Parvigondolella in Pizzo Mondello, confirming that genus Parvigondolella is a real taxon and not a phenotype. A new conodont species named Parvigondolella ciarapicae n. sp. is described here for the first time.