Tiny sea anemone from the Lower Cambrian of China.
<h4>Background</h4>Abundant fossils from the Ediacaran and Cambrian showing cnidarian grade grossly suggest that cnidarian diversification occurred earlier than that of other eumetazoans. However, fossils of possible soft-bodied polyps are scanty and modern corals are dated back only to...
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| Format: | Article |
| Language: | English |
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Public Library of Science (PLoS)
2010-10-01
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| Series: | PLoS ONE |
| Online Access: | https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/20967244/?tool=EBI |
| _version_ | 1818845474371665920 |
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| author | Jian Han Shin Kubota Hiro-omi Uchida George D Stanley Xiaoyong Yao Degan Shu Yong Li Kinya Yasui |
| author_facet | Jian Han Shin Kubota Hiro-omi Uchida George D Stanley Xiaoyong Yao Degan Shu Yong Li Kinya Yasui |
| author_sort | Jian Han |
| collection | DOAJ |
| description | <h4>Background</h4>Abundant fossils from the Ediacaran and Cambrian showing cnidarian grade grossly suggest that cnidarian diversification occurred earlier than that of other eumetazoans. However, fossils of possible soft-bodied polyps are scanty and modern corals are dated back only to the Middle Triassic, although molecular phylogenetic results support the idea that anthozoans represent the first major branch of the Cnidaria. Because of difficulties in taxonomic assignments owing to imperfect preservation of fossil cnidarian candidates, little is known about forms ancestral to those of living groups.<h4>Methods and findings</h4>We have analyzed the soft-bodied polypoid microfossils Eolympia pediculata gen. et sp. nov. from the lowest Cambrian Kuanchuanpu Formation in southern China by scanning electron microscopy and computer-aided microtomography after isolating fossils from sedimentary rocks by acetic acid maceration. The fossils, about a half mm in body size, are preserved with 18 mesenteries including directives bilaterally arranged, 18 tentacles and a stalk-like pedicle. The pedicle suggests a sexual life cycle, while asexual reproduction by transverse fission also is inferred by circumferential grooves on the body column.<h4>Conclusions</h4>The features found in the present fossils fall within the morphological spectrum of modern Hexacorallia excluding Ceriantharia, and thus Eolympia pediculata could be a stem member for this group. The fossils also demonstrate that basic features characterizing modern hexacorallians such as bilateral symmetry and the reproductive system have deep roots in the Early Cambrian. |
| first_indexed | 2024-12-19T05:30:14Z |
| format | Article |
| id | doaj.art-c2145110a4ca4488803aec1f671b750b |
| institution | Directory Open Access Journal |
| issn | 1932-6203 |
| language | English |
| last_indexed | 2024-12-19T05:30:14Z |
| publishDate | 2010-10-01 |
| publisher | Public Library of Science (PLoS) |
| record_format | Article |
| series | PLoS ONE |
| spelling | doaj.art-c2145110a4ca4488803aec1f671b750b2022-12-21T20:34:16ZengPublic Library of Science (PLoS)PLoS ONE1932-62032010-10-01510e1327610.1371/journal.pone.0013276Tiny sea anemone from the Lower Cambrian of China.Jian HanShin KubotaHiro-omi UchidaGeorge D StanleyXiaoyong YaoDegan ShuYong LiKinya Yasui<h4>Background</h4>Abundant fossils from the Ediacaran and Cambrian showing cnidarian grade grossly suggest that cnidarian diversification occurred earlier than that of other eumetazoans. However, fossils of possible soft-bodied polyps are scanty and modern corals are dated back only to the Middle Triassic, although molecular phylogenetic results support the idea that anthozoans represent the first major branch of the Cnidaria. Because of difficulties in taxonomic assignments owing to imperfect preservation of fossil cnidarian candidates, little is known about forms ancestral to those of living groups.<h4>Methods and findings</h4>We have analyzed the soft-bodied polypoid microfossils Eolympia pediculata gen. et sp. nov. from the lowest Cambrian Kuanchuanpu Formation in southern China by scanning electron microscopy and computer-aided microtomography after isolating fossils from sedimentary rocks by acetic acid maceration. The fossils, about a half mm in body size, are preserved with 18 mesenteries including directives bilaterally arranged, 18 tentacles and a stalk-like pedicle. The pedicle suggests a sexual life cycle, while asexual reproduction by transverse fission also is inferred by circumferential grooves on the body column.<h4>Conclusions</h4>The features found in the present fossils fall within the morphological spectrum of modern Hexacorallia excluding Ceriantharia, and thus Eolympia pediculata could be a stem member for this group. The fossils also demonstrate that basic features characterizing modern hexacorallians such as bilateral symmetry and the reproductive system have deep roots in the Early Cambrian.https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/20967244/?tool=EBI |
| spellingShingle | Jian Han Shin Kubota Hiro-omi Uchida George D Stanley Xiaoyong Yao Degan Shu Yong Li Kinya Yasui Tiny sea anemone from the Lower Cambrian of China. PLoS ONE |
| title | Tiny sea anemone from the Lower Cambrian of China. |
| title_full | Tiny sea anemone from the Lower Cambrian of China. |
| title_fullStr | Tiny sea anemone from the Lower Cambrian of China. |
| title_full_unstemmed | Tiny sea anemone from the Lower Cambrian of China. |
| title_short | Tiny sea anemone from the Lower Cambrian of China. |
| title_sort | tiny sea anemone from the lower cambrian of china |
| url | https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/20967244/?tool=EBI |
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