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
Branchiocaris
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Branchiocaris is an extinct genus of Cambrian bivalved arthropod. The type and best known species, Branchiocaris pretiosa, was described from the Burgess Shale of British Columbia, Canada, in 1929, or
