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The genus '''''Xidazoon''''' was erected by Shu, et al. (1999) based on [[fossil]]s found in the Qiongzhusi (Chiungchussu) Formation, Yu'anshan Member (Eoredlichia zone), Lower Cambrian, Haikou, ([[ |
The genus '''''Xidazoon''''' was erected 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 currently consists of the single species ''Xidazoon stephanus''. |
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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]] 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 six [[Segment (biology)|segment]]s covered in [[cuticle]] with three less well-defined segments at the anterior end. 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]] 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 six [[Segment (biology)|segment]]s covered in [[cuticle]] with three less well-defined segments at the anterior end. 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. |
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Revision as of 17:09, 26 September 2008
| Xidazoon Temporal range: Cambrian
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|---|---|
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| Artist's concept of Xidazoon stephanus | |
| Scientific classification | |
| Kingdom: | |
| Phylum: | Shu, et al. 2001
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| Order: | Chen & Zhou 1997
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| Family: | Shu & Han 2001
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| Genus: | Xidazoon Shu, Conway Morris & Zhang 1999
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| Species: | X. stephanus
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| Binomial name | |
| Xidazoon stephanus | |
The genus Xidazoon was erected 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 currently consists of the single species Xidazoon stephanus.
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 six segments covered in cuticle with three less well-defined segments at the anterior end. 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.
See also
References
- Shu, D.-G., Conway Morris, S., Zhang, X.-L., Chen, L., Li, Y. and Han, J. 1999. A pipiscid-like fossil from the Lower Cambrian of south China, Nature, 400:746-749. (August 19 1999). [1] - URL retrieved December 1 2005.
- Shu, D.-G., Conway Morris, S., Han, J., Chen, L., Zhang, X.-L., Zhang, Z.-F., Liu, H.-Q., Li, Y., and Liu, J.-N. 2001. Primitive Deuterostomes from the Chengjiang Lagerstätte (Lower Cambrian, China), Nature, 414:419-424. (November 11 2001). [2]. - URL retrieved December 2 2005
External links
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