Pomatrum: Difference between revisions
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'''''Pomatrum''''' is an extinct [[vetulicolia]]n, the senior synonym of ''Xidazoon''; the latter taxon was described by Shu, et al. (1999) based on [[fossil]]s found in the Qiongzhusi (Chiungchussu) Formation, Yu'anshan Member (Eoredlichia zone), Lower Cambrian, Haikou, ([[Kunming]]), about 50 km west of [[Chengjiang]], [[China]]. It has been likened to the chordate ''[[Pipiscus]]''.<ref>{{cite journal|doi=10.1038/23445|year=1999|last1=Shu|first1=D.|journal=Nature|volume=400|issue=6746|pages=746|last2=Morris|first2=S. Conway|last3=Zhang|first3=X-L.|last4=Chen|first4=L.|last5=Li|first5=Y.|last6=Han|first6=J.}}</ref> |
'''''Pomatrum''''' is an extinct [[vetulicolia]]n, the senior synonym of ''Xidazoon''; the latter taxon was described by Shu, et al. (1999) based on [[fossil]]s found in the Qiongzhusi (Chiungchussu) Formation, Yu'anshan Member (Eoredlichia zone), Lower Cambrian, Haikou, ([[Kunming]]), about 50 km west of [[Chengjiang]], [[China]]. It has been likened to the chordate ''[[Pipiscus]]''.<ref>{{cite journal|doi=10.1038/23445|year=1999|last1=Shu|first1=D.|journal=Nature|volume=400|issue=6746|pages=746|last2=Morris|first2=S. Conway|last3=Zhang|first3=X-L.|last4=Chen|first4=L.|last5=Li|first5=Y.|last6=Han|first6=J.|title=A pipiscid-like fossil from the Lower Cambrian of south China}}</ref> |
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The fossils show that the body of the animal was divided into two parts. The [[anterior]] part of the body is moderately inflated, with a prominent [[mouth]] circlet. It has faint [[Transverse plane|transverse]] divisions towards the front, but is otherwise smooth. The mouth circlet consists of about 30 plates divided into inner and outer regions. The anterior section has five structures on each side, which are interpreted as [[gills]]. A dark region running close to the [[ventral]] and posterior margins is interpreted as an [[endostyle]]. The condition of the anterior portion of the fossils suggests that it was thin-walled, i.e., that the anterior portion was largely hollow. The [[Posterior (anatomy)|posterior]] part of the body tapers towards front and back (diamond-shaped), and is divided into seven [[Segment (biology)|segment]]s covered in [[cuticle]] with three less well-defined segments at the anterior end.<ref>Shu Degan. (2005) "On The Phylum Vetulicolia." ''Chinese Science Bulletin.''</ref> There are short spines at the posterior tip. The authors describe an [[alimentary canal]] with terminal openings and a rectum with what might be dilator muscles. |
The fossils show that the body of the animal was divided into two parts. The [[anterior]] part of the body is moderately inflated, with a prominent [[mouth]] circlet. It has faint [[Transverse plane|transverse]] divisions towards the front, but is otherwise smooth. The mouth circlet consists of about 30 plates divided into inner and outer regions. The anterior section has five structures on each side, which are interpreted as [[gills]]. A dark region running close to the [[ventral]] and posterior margins is interpreted as an [[endostyle]]. The condition of the anterior portion of the fossils suggests that it was thin-walled, i.e., that the anterior portion was largely hollow. The [[Posterior (anatomy)|posterior]] part of the body tapers towards front and back (diamond-shaped), and is divided into seven [[Segment (biology)|segment]]s covered in [[cuticle]] with three less well-defined segments at the anterior end.<ref>Shu Degan. (2005) "On The Phylum Vetulicolia." ''Chinese Science Bulletin.''</ref> There are short spines at the posterior tip. The authors describe an [[alimentary canal]] with terminal openings and a rectum with what might be dilator muscles. |
Revision as of 16:40, 14 April 2016
Pomatrum Temporal range:
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Artist's conception | |
Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | †Vetulicolia |
Class: | †Vetulicolida |
Order: | †Vetulicolata |
Family: | †Didazoonidae |
Genus: | †Pomatrum |
Species: | †P. ventralis
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Binomial name | |
†Pomatrum ventralis Luo and Hu, in Luo et al., 1999
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Synonyms | |
Xidazoon stephanusAttention: This template ({{ref doi}}) is deprecated. To cite the publication identified by doi:10.1111/j.1475-4983.2006.00606.x, please use {{cite journal}} with |
Pomatrum is an extinct vetulicolian, the senior synonym of Xidazoon; the latter taxon was described by Shu, et al. (1999) based on fossils found in the Qiongzhusi (Chiungchussu) Formation, Yu'anshan Member (Eoredlichia zone), Lower Cambrian, Haikou, (Kunming), about 50 km west of Chengjiang, China. It has been likened to the chordate Pipiscus.[1]
The fossils show that the body of the animal was divided into two parts. The anterior part of the body is moderately inflated, with a prominent mouth circlet. It has faint transverse divisions towards the front, but is otherwise smooth. The mouth circlet consists of about 30 plates divided into inner and outer regions. The anterior section has five structures on each side, which are interpreted as gills. A dark region running close to the ventral and posterior margins is interpreted as an endostyle. The condition of the anterior portion of the fossils suggests that it was thin-walled, i.e., that the anterior portion was largely hollow. The posterior part of the body tapers towards front and back (diamond-shaped), and is divided into seven segments covered in cuticle with three less well-defined segments at the anterior end.[2] There are short spines at the posterior tip. The authors describe an alimentary canal with terminal openings and a rectum with what might be dilator muscles.
Based on a comparison of the incomplete/damaged holotype with the incomplete/damaged holotype of Pomatrum ventralis, researchers Aldridge, et al., proposed that X. stephanus was a junior synonym of P. ventralis because the anterior portions of the two species are largely identical.[3]
See also
References
- ^ Shu, D.; Morris, S. Conway; Zhang, X-L.; Chen, L.; Li, Y.; Han, J. (1999). "A pipiscid-like fossil from the Lower Cambrian of south China". Nature. 400 (6746): 746. doi:10.1038/23445.
- ^ Shu Degan. (2005) "On The Phylum Vetulicolia." Chinese Science Bulletin.
- ^ Aldridge, et al. (2007) "The Systematics and Phylogenetic Relationships of Vetulicolians." Paleontology. Volume 50
- . doi:0.1038/23445 (inactive 2016-04-14) http://www.paper.edu.cn/project/nwu1/nwu1-9.pdf. Retrieved 2005.
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(help)CS1 maint: DOI inactive as of April 2016 (link) - Shu, D.-G.; Morris, S. Conway; Han, J.; Chen, L.; Zhang, X.-L.; Zhang, Z.-F.; Liu, H.-Q.; Li, Y.; Liu, J.-N. (2001). "Primitive deuterostomes from the Chengjiang Lagerstätte (Lower Cambrian, China)" (PDF). Nature. 414 (6862): 419. doi:10.1038/35106514. PMID 11719797. Retrieved 2005.
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