Combinivalvula chengjiangensis, Shelled Arthropod Fossil from Chengjiang

Name: Combinivalvula chengjiangensis (Chengjiang Biota)

Phylum Arthrpoda

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

Size (25.4mm=1 inch): 35 mm long by 23 mm across on a 50 mm by 36 mm matrix

Fossil Site: Chengjiang - Quiongzhusi Section, Yu’anshan Member, Heilinpu Formation, Mafang Village, Anning, Kunming, Yunnan Province, China

Combinivalvula chengjiangensis chengjiang fossilDescription: This unusual bivalved arthropod is known as Combinivalvula. They have a fairly wrinkled carapace which is indicative of its thin, relatively unmineralized nature. This structure hinged along the dorsal edge like a bivalve, but the juncture is only evident posteriorly. The fact that the hinge is incomplete is indicative of the fact that the shell was not designed to close. Rarely are any soft parts preserved. Combinivalvula has been placed by some as a relative of the waptiids. This taxon is only known from the Chengjiang Biota.

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