Perspicaris
Sign in to savePerspicaris (from the Latin perspicax, meaning “sharp-sighted,” and caris, “crab/shrimp”) an extinct genus of bivalved arthropod from the Cambrian period. Fossils have been found in North America, primarily the Burgess Shale of British Columbia, Canada but also possibly the Wheeler Shale, Marjum Formation, Pioche Shale and Bloomington Formation. Two named species are known from the Burgess Shale Perspicaris dictynna and Perspicaris recondita, which differ in maximum size ( in P. recondita vs in P. dictynna), as well as proportions of the tail. Both species have a pair of stalked eyes, as well
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Perspicaris (from the Latin perspicax, meaning “sharp-sighted,” and caris, “crab/shrimp”) an extinct genus of bivalved arthropod from the Cambrian period. Fossils have been found in North America, primarily the Burgess Shale of British Columbia, Canada but also possibly the Wheeler Shale, Marjum Formation, Pioche Shale and Bloomington Formation. Two named species are known from the Burgess Shale Perspicaris dictynna and Perspicaris recondita, which differ in maximum size ( in P. recondita vs in P. dictynna), as well as proportions of the tail. Both species have a pair of stalked eyes, as well as a pair of large segmented antennae. The tail is forked and spiny. They are thought to have been active swimmers (nektonic).
File:Perspicaris dictynna.png|Restoration of P.dictynna File:Perspicaris recondita.png|Restoration of P. recondita File:USNM PAL 189280 Perspicaris dictynna Image 03.jpg|Holotype of P. dictynna File:USNM PAL 114255 Perspicaris recondita Image 04.jpg|Holotype of P. recondita