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Holotype specimen of Fibulacaris nereidis (ROMIP 65380) | |
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Genus: | Fibulacaris Izquierdo-López & Caron, 2019 |
Fibulacaris is a monotypic genus of fossil arthropod known only by one species, Fibulacaris nereidis, discovered from the Cambrian Burgess Shale of Canada. [1] It was characterized by a bivalved carapace with an inverted rostrum, sandwiching the slender body with stalked eyes and homonomous appendages. [1] It was probably an actively swimming filter feeder and possibly swam upside-down like some branchiopod crustaceans and horseshoe crabs. [1] Phylogenetic analysis suggest it was a relative or member of Hymenocarina, which contains other bivalved arthropods. [1] [2]