Scaphopoda is the sister taxon to Bivalvia: Evidence of ancient incomplete lineage sorting

文献类型： 外文期刊

第一作者： Song, Hao

作者： Song, Hao;Wang, Yunan;Li, Zhuoqing;Shi, Pu;Zhang, Tao;Li, Cui;Ma, Peizhen;Wang, Haiyan;Song, Hao;Zhang, Tao;Wang, Haiyan;Song, Hao;Wang, Yunan;Li, Zhuoqing;Shi, Pu;Zhang, Tao;Li, Cui;Ma, Peizhen;Wang, Haiyan;Shao, Haojing;Hu, Pinli;Yap-Chiongco, Meghan K.;Kocot, Kevin M.;Wang, Yiguan;Vinther, Jakob;Vinther, Jakob;Kocot, Kevin M.

作者机构：

关键词： Scaphopoda; mollusc phylogeny; mollusc fossils; incomplete lineage sorting; Cambrian explosion

期刊名称：PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA （ 影响因子：9.4； 五年影响因子：10.8 ）

ISSN： 0027-8424

年卷期： 2023 年 120 卷 40 期

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收录情况： SCI

摘要： The almost simultaneous emergence of major animal phyla during the early Cambrian shaped modern animal biodiversity. Reconstructing evolutionary relationships among such closely spaced branches in the animal tree of life has proven to be a major challenge, hindering understanding of early animal evolution and the fossil record. This is particularly true in the species -rich and highly varied Mollusca where dramatic inconsistency among paleontological, morphological, and molecular evidence has led to a long- standing debate about the group's phylogeny and the nature of dozens of enigmatic fossil taxa. A critical step needed to overcome this issue is to supplement available genomic data, which is plentiful for well- studied lineages, with genomes from rare but key lineages, such as Scaphopoda. Here, by presenting chromosome -level genomes from both extant scaphopod orders and leveraging complete genomes spanning Mollusca, we provide strong support for Scaphopoda as the sister taxon of Bivalvia, revitalizing the morphology -based Diasoma hypothesis originally proposed 50 years ago. Our molecular clock analysis confidently dates the split between Bivalvia and Scaphopoda at similar to 520 Ma, prompting a reinterpretation of controversial laterally compressed Early Cambrian fossils, includingAnabarella, Watsonella, and Mellopegma, as stem diasomes. Moreover, we show that incongruence in the phylogenetic placement of Scaphopoda in previous phylogenomic studies was due to ancient incomplete lineage sorting (ILS) that occurred during the rapid radiation of Conchifera. Our findings highlight the need to consider ILS as a potential source of error in deep phylogeny reconstruction, especially in the context of the unique nature of the Cambrian Explosion.

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