| Описание: | Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Still, there are anatomical differences from Haikouella, including a smaller stomach and much larger (1 mm) pharyngeal teeth. However, some authors think that Yunnanozoon is closely related to the chordate Haikouella and that Yunnanozoon is probably a chordate rather than a hemichordate. Yunnanozoon somewhat resembles the Middle Cambrian Pikaia from the Burgess shale of British Columbia in Canada. Yunnanozoon lividum ("Livid Animal of Yunnan") is a suspected chordate or hemichordate from the Lower Cambrian, Chengjiang biota of Yunnan province, China. Yunnanozoon is similar to the form Haikouella which is almost certainly a vertebrate. Yunannozoon is not known for sure to possess many features like heart, gills, etc. that are known from well preserved specimens of Haikouella. A close relationship between Yunnanozoon and the phylum Vetulicolia has also been proposed. Thirteen pairs of symmetrically arranged gonads have been identified as have possible gill slits. |
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