High Quality Content by WIKIPEDIA articles! Yongjiacaris zhejiangensis is an extinct species of shrimp, and the only species in the genus Yongjiacaris. Yongjiacaris represents the second report of freshwater caridean shrimp from the Mesozoic. The name of the genus Yongjiacaris refers to Yongjia County, in the Zhejiang Province of China, while the species name Y. zhejiangensis is derived from the province name. Yonjiacaris was formally described by Alessandro Garassino, Shen Yanbin, Frederick R. Schram, and Rod S. Taylor in 2002. It is described from 138 specimens discovered in the C Member of the Moshishan Formation of Yongjia County, and from specimens found in the Showchang Formation near Jiande, both in southeastern China. These two correlative rock units date to the Barremian age of the Early Cretaceous; volcanic rocks in the C Member of the Moshishan Formation are dated to 120 million years old, and volcanic rocks in the Showchang Formation are dated to 118 million years ago. The C Member of the Moshishan Formation is a heterogeneous rock unit including sandstone, shale, tuff, conglomerate, and rhyolite, while the Showchang Formation is dominantly sandstone and mudstone.

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