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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.
Echidnacaris briggsi is an extinct species of radiodont known from the Cambrian Stage 4 aged Emu Bay Shale of Australia.Formerly referred to as "Anomalocaris" briggsi, it was placed in the new monotypic genus Echidnacaris in 2023. [1]
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]
Radiodonta is an extinct order of stem-group arthropods that was successful worldwide during the Cambrian period. Radiodonts are distinguished by their distinctive frontal appendages, which are morphologically diverse and were used for a variety of functions.
In 2011, seven fossils of large, isolated compound eyes were described from the inland quarry site at Emu Bay, as well as the first well-preserved visual surfaces of the eyes of Anomalocaris. The latter specimens are consistent with anomalocaridids being closely related to arthropods as had been suspected. The find also indicated that advanced ...
Lenisicaris is only known from frontal appendages, though these specimens have several distinguishing traits, most noticeably the lack of auxiliary spines. [5] The type species L. lupata has smaller, triangular endites, closely resembling those of Anomalocaris. [1]
Early schizochroal eye designs appear haphazard and irregular – possibly constrained by the geometrical complications of packing identical sized lenses on a curved surface. Later schizochroal eyes had size graduated lens. [22] The abathochroal eye is the third eye morphology of trilobites, but it has found only within the Eodiscina. This form ...
Anomalocaris canadensis is the 3-ft giant, found in the Burgess Shale, about 505 MA. Laggania cambria seems about 6 in. to 1 foot. Also from the Burgess Shale. Sam Gon's pages include fossils and reconstructions of Anomalocaris saron and Amplectobelua symbrachiata from the Chengjiang biota of in the Maotianshan Shales. These fossils date to ...