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March 8, 2014 |
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Yunnanozoon is similar to the form <Haikouella, which is almost certainly a chordata|vertebrate. Still, there are anatomical differences from Haikouella, including a smaller stomach and much larger (1mm) pharyngeal teeth. Yunannozoon is not known for sure to possess many features like heart, gills, etc. that are known from well preserved specimens of Haikouella. Yunnanozoon somewhat resembles the Middle Cambrian Pikaia from the Burgess shale of British Columbia in Canada. 13 pairs of symmetrically arranged gonads have been identified as are possible gill slits. However, some authors think that Yunnanozoon is closely related to the chordata|chordate Haikouella and that Yunnanozoon is probably a chordate rather than a hemichordate. There is one species Yunnanozoon lividum (Chen et al., 1995).
Category:Fossils This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Yunnanozoon".
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