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タイトル: | Divergent evolution of medusozoan symmetric patterns: Evidence from the microanatomy of Cambrian tetramerous cubozoans from South China |
著者: | Han, Jian Kubota, Shin Li, Guoxiang Ou, Qiang Wang, Xing Yao, Xiaoyong Shu, Degan Li, Yong Uesugi, Kentaro Hoshino, Masato Sasaki, Osamu Kano, Harumasa Sato, Tomohiko Komiya, Tsuyoshi |
著者名の別形: | 久保田, 信 |
キーワード: | Early Cambrian Kuanchuanpu Formation Tetra-radial symmetry Cubozoan Embryos |
発行日: | Mar-2016 |
出版者: | Elsevier B.V. |
誌名: | Gondwana Research |
巻: | 31 |
開始ページ: | 150 |
終了ページ: | 163 |
抄録: | Living medusozoans and their Middle Cambrian ancestors are characterized fundamentally by four-fold symmetry. The symmetric pattern of their earlier antecedents during the Ediacaran–Cambrian transition, traditionally expected to be tetramerous, needs to be reconsidered in the light of Cambrian pentamerous fossil medusozoans. Here we present a microanatomic analysis of three tiny tetramerous specimens from the Lower Cambrian Kuanchuanpu Formation in southern China; they display diagnostic characteristics of Cubomedusae, including paired but well-separated interradial tentacles deep in the subumbrellar cavity, interradial septa connected by claustra, coronal muscles at the subumbrella, and an annular velarium suspended by twelve frenula. These fossils likely represent three new taxa of a monophyletic stem group of cubomedusans, which is further confirmed by our phylogenetic analysis based on the data matrix with 25 taxa and 107 characteristics. Among these fossil cubozoans and co-occurring pentamerous forms, the specimen ELISN31-31 is mostly close to the crown-group Cubomedusae with regard to its narrow vascular cavity and the endodermic perradial fusion. Diverse symmetrical patterns among different lineages of early Cambrian medusozoan candidates might have been independently evolved in different classes of medusozoans. |
著作権等: | © 2015. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/ The full-text file will be made open to the public on 1 March 2018 in accordance with publisher's 'Terms and Conditions for Self-Archiving'. この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。 This is not the published version. Please cite only the published version. |
URI: | http://hdl.handle.net/2433/204554 |
DOI(出版社版): | 10.1016/j.gr.2015.01.003 |
出現コレクション: | 学術雑誌掲載論文等 |
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