MUSEUM QUALITY Yunnanozoon Chordate Precursor

and Arthropod Fossil Association

Yunnanozoon lividum

Phylum Hemichordata

Phylum Arthropoda indet

Geological Time: Early Cambrian (~525 million years ago)

Size (25.4mm=1 inch): Yunnanozoon fossil is 51 mm long; Arthropod fossil is 110 mm long (curve measure), all on a 120 mm by 165 mm matrix

Fossil Site: Chengjiang Maotianshan Shales - Quiongzhusi Section, Yu’anshan Member, Heilinpu Formation, Jianshan Hill, Ercaicun Village, Haikou Town, Anning, Yunnan Province, China

Fossil Code: CJF1332

Price: $4995.00 - sold

Yunnanozoon lividumDescription: The highlight of this fine fossil Yunnanozoon lividum, that has been designated as the earliest known hemichordate. Possessing many of the characteristic chordate features and providing an anatomical link between invertebrates and chordates, the Hemichordata is a minor but important phylum in evolutionary biology. It at one point Yunnanozoon was thought to be a Yunnanozoon Fossil Artmember of the Phylum Chordata, but has been reassigned as mentioned above. This one comes from the Chengjiang deposits near Anning, Yunnan Province, China. As the earliest of the hemichordates, its study casts light upon the early evolution of both the chordates and the vertebrates that sprung from them as the story of life unfolded. The large fossil arthropod is as yet not described, but appears to have affinities with the somewhat younger Guangweicaris (see my other offerings). Note the presence of the eyes and a partial limb obscured by the Yunnanozoon, which is the largest such specimen I have ever seen. There is minor restoration as indicated in the photo, but this is overall the finest example I have seen in six years, and would serve as the cornerstone of any cabinet display or museum collection.

Also see: Chengjiang Biota Fauna List Chengjiang Fossils

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