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A Cambrian crown annelid reconciles phylogenomics and the fossil record

机译：寒武纪皇冠环节和化石记录调和

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摘要

Abstract The phylum of annelids is one of the most disparate animal phyla and encompasses ambush predators, suspension feeders and terrestrial earthworms1. The early evolution of annelids remains obscure or controversial2,3, partly owing to discordance between molecular phylogenies and fossils2,4. Annelid fossils from the Cambrian period have morphologies that indicate epibenthic lifestyles, whereas phylogenomics recovers sessile, infaunal and tubicolous taxa as an early diverging grade5. Magelonidae and Oweniidae (Palaeoannelida1) are the sister group of all other annelids but contrast with Cambrian taxa in both lifestyle and gross morphology2,6. Here we describe a new fossil polychaete (bristle worm) from the early Cambrian Canglangpu formation7 that we name Dannychaeta tucolus, which is preserved within delicate, dwelling tubes that were originally organic. The head has a well-defined spade-shaped prostomium with elongated ventrolateral palps. The body has a wide, stout thorax and elongated abdomen with biramous parapodia with parapodial lamellae. This character combination is shared with extant Magelonidae, and phylogenetic analyses recover Dannychaeta within Palaeoannelida. To our knowledge, Dannychaeta is the oldest polychaete that unambiguously belongs to crown annelids, providing a constraint on the tempo of annelid evolution and revealing unrecognized ecological and morphological diversity in ancient annelids.
机译：摘要Annelids的门是最偏差的动物植物之一，包括伏击捕食者，悬浮饲料和陆地蚯蚓1。 Annelids的早期演变仍然是模糊或争议的2,3，部分原因是分子系统和化石之间的一种不和谐2,4。来自寒武纪时期的环形化石具有表明癫痫素的形态，而文学因素恢复了术，作为早期分歧的术语，婴儿和毒物分类群。 Magelonidae和Oweniidae（Palaeoannelida1）是所有其他环庄的姐妹组，而是与生活方式和毛的形态学2,6的寒武纪分类群相比。在这里，我们描述了来自早期寒武纪Canglangpu Flower7的新化石多芯片（Bristle Worm），我们命名Dannychaeta TucoLus，这些是在最初有机的精致的居住管内保存。头部有一个明确界定的铲形叉子，具有细长的腹侧palps。身体具有宽，胸部和细长的腹部，带有剖腹产膜的果酱副植物。该角色组合与现存Magelonidae共享，并且系统发育分析在PalaeOnnelida内恢复Dannychaeta。为了我们的知识，Dannychaeta是最古老的多档，毫不含糊地属于Crown Annelids，为古代Annelids揭示了环形演化的节奏和揭示了无法识别的生态和形态多样性的制约因素。

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  • 来源
    《Nature》 |2020年第7815期|249-252|共4页
  • 作者

    Hong Chen; Luke A. Parry; Jakob Vinther; Dayou Zhai; Xianguang Hou; Xiaoya Ma;

  • 作者单位

    Yunnan University|Yunnan University|Liupanshui Normal University;

    Yale University|University of Oxford;

    University of Bristol|University of Bristol;

    Yunnan University|Yunnan University;

    Yunnan University|Yunnan University;

    Yunnan University|Yunnan University|University of Exeter;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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