Fuxianhuiida
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Fuxianhuiida is an extinct clade of arthropods from the Cambrian of China. All currently known species are from Cambrian Series 2 aged deposits in Yunnan Province, including the Chengjiang biota. They
Diagrammatic reconstruction of Alacaris, with the underside of the head of Chengjiangocaris bottom right.
Fossil of Fuxianhuia
Hymenocarina
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Hymenocarina is an order of extinct marine arthropods known from the Cambrian. They possess bivalved carapaces, typically with exposed posteriors. Members of the group are morphologically diverse and
Waptia diagram
Canadaspis perfecta USNM 57703
Only 2 cm-long Fibulacaris is suggested to have swum upside down
The carapace of possible hymenocarine Pseudoarctolepis had wing-like projections