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- Publisher
- Wiley
- Copyright
- © 2011 Geological Society of China
- ISSN
- 1000-9515
- eISSN
- 1755-6724
- DOI
- 10.1111/j.1755-6724.2011.00381.x
- Publisher site
- See Article on Publisher Site
Abstract
Abstract: In the light of Synchrotron Radiation X‐ray Tomographic Microscopy (SRXTM), the internal structure of Markuelia hunanensis is revealed. In one example, vitrification and peeling show the annuli hidden under the chorion. Sectioning and 3‐D reconstruction display an intact digestive tract from the inverted introvert to the terminal anus. The inverted introvert forms a rugby cavum. The following digestive tract is rope‐like coiling, parallel to the body axis, about 650 μm in length, and uniform in diameter (∼80 μm). An exquisitely preserved pipe‐like structure is hidden in the middle of the rope‐like structure, diameter 20–40 μm, with a length of ∼120 μm. We interpret this pipe‐like structure as the possible epidermis of the gut and its surroundings as the possible residue of musculature, similar to that in Priapulans. The two symmetrical rod‐shape structures connecting the body wall and digestive tract are interpreted as the possible retractor muscles. After comparing the well preserved Left‐form and Right‐form Body of Markuelia, we suggest that they may represent a dimorphism. Counted directly, one sample of Markuelia hunanensis possesses 62 annulations and the other 68.
Journal
Acta Geologica Sinica (English Edition) – Wiley
Published: Feb 1, 2011