Acosmia
| Acosmia Temporal range:
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|---|---|
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| Fossil specimen | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Superphylum: | Ecdysozoa |
| Genus: | †Acosmia Chen & Zhoi 1997 |
| Species: | †A. maotiania
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| Binomial name | |
| †Acosmia maotiania Chen & Zhoi 1997
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Acosmia is an extinct genus of marine worm from the Cambrian aged Chengjiang biota of Yunnan, China. It is represented by a single rare species, Acosmia maotiania, that reached 45 mm in length and 9 mm in width.[1] It was likely a burrowing animal that fed by deposit feeding.[2] While originally suggested it to be a priapulid (penis worm), a 2020 study proposed to be a stem-group ecdysozoan, due to lacking the radial pharygneal armature that characterises modern ecdysozoans, including priapulids.[2] Later studies suggested that Acosmia was more likely a crown-group ecdysozoan possibly alied with nematoids.[3][4]
References
[edit]- ^ Hou, Xian-Guag; Aldridge, Richard; Bergstrom, Jan; Siveter, David J; Siveter, Derek; Feng, Xiang-Hong (2008-04-15). The Cambrian Fossils of Chengjiang, China: The Flowering of Early Animal Life. John Wiley & Sons. ISBN 9780470999943.
- ^ a b Howard, Richard J.; Edgecombe, Gregory D.; Shi, Xiaomei; Hou, Xianguang; Ma, Xiaoya (2020-11-23). "Ancestral morphology of Ecdysozoa constrained by an early Cambrian stem group ecdysozoan". BMC Evolutionary Biology. 20 (1): 156. Bibcode:2020BMCEE..20..156H. doi:10.1186/s12862-020-01720-6. ISSN 1471-2148. PMC 7684930. PMID 33228518.
- ^ Wang, Deng; Qiang, Yaqin; Guo, Junfeng; Vannier, Jean; Song, Zuchen; Peng, Jiaxin; Zhang, Boyao; Sun, Jie; Yu, Yilun; Zhang, Yiheng; Zhang, Tao; Yang, Xiaoguang; Han, Jian (2024-07-08). Kuraku, Shigehiro; Desplan, Claude (eds.). "Early evolution of the ecdysozoan body plan". eLife. 13: RP94709. doi:10.7554/eLife.94709. ISSN 2050-084X. PMID 38976315.
- ^ Smith, Martin Ross; Dhungana, Alavya (2022). "Discussion on 'Tabelliscolex (Cricocosmiidae: Palaeoscolecidomorpha) from the early Cambrian Chengjiang Biota and the evolution of seriation in Ecdysozoa' by Shi et al. 2021 (JGS, jgs2021-060)". Journal of the Geological Society. 179 (3): jgs2021–111. Bibcode:2022JGSoc.179..111S. doi:10.1144/jgs2021-111.
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