Alalcomenaeus, Unusual Opabinid Arthropod Fossil Chengjiang

Name: Alalcomenaeus sp.

Phylum Arthropoda

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

Size: 26 mm long on a 50 mm by 57 mm matrix

Fossil Site: Chengjiang Biota, Qiongzhusi Section, Yu'anshan Member, Heilinpu Formation, Maotianshan Hill, Yuxi, Chengjiang County, Yunnan Province, China

Alalcomenaeus, Unusual Opabinid Arthropod Fossil ChengjiangThe specimen is a member of the "great appendage arthropods" known as the opabinids after Opabinia from the Burgess Shale Fauna. Other members from Chengjiang are Jianfengia and Leanchoilia. The long antenna and exceptional detail of the appendages are readily apparent in this fine specimen. The taxon is unknown outside the Chengjiang Biota. This is a truly exceptional specimen and representative of the Cambrian explosion.

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