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Anomalocaris ("unlike other shrimp", or "abnormal shrimp") is an extinct genus of radiodont, an order of early-diverging stem-group marine arthropods.. It is best known from the type species A. canadensis, found in the Stephen Formation (particularly the Burgess Shale) of British Columbia, Canada.
Anomalocarididae [1] (occasionally mis-spelt Anomalocaridae [2]) is an extinct family of Cambrian radiodonts, a group of stem-group arthropods. [3] [4]Around 1990s and early 2010s, Anomalocarididae included all radiodont species, hence the previous equivalent of the common name "anomalocaridid" to the whole Radiodonta. [5]
Anomalocaris is a member of the anomalocarididae family, which at one point included all radiodonts, but now only includes a few genera such as Lenisicaris. Amplectobelua and Lyrarapax are representatives of the amplectobeluidae which is a very inclusive family of mainly Chinese radiodonts.
Formerly referred to as "Anomalocaris" briggsi, it was placed in the new monotypic genus Echidnacaris in 2023. [1] It is only distantly related to true Anomalocaris, and is instead placed in the family Tamisiocarididae. [2] Echidnacaris is primarily known from its frontal appendages which had 13 podomeres. [1]
Titanokorys is a radiodont belonging to the family Hurdiidae. Hurdiids can be distinguished from other radiodonts by the rake-like frontal appendages which each bore a single row of elongated endites with only anterior auxiliary spines, alongside the combination of enlarged head sclerites and tetraradial mouthparts (oral cone).
Incredibly well-preserved fossils of the oldest swimming jellyfish, which lived 505 million years ago, were discovered at a famed fossil site in Canada.