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Opabinia regalis is an extinct, stem group arthropod found in the Middle Cambrian Burgess Shale Lagerstätte (505 million years ago) of British Columbia. [1] Opabinia was a soft-bodied animal, measuring up to 7 cm in body length, and had a segmented trunk with flaps along its sides and a fan-shaped tail.
A close relative of Hurdia that was originally named as a jellyfish, but was later recognized as the oral cone of the creature. This creature is also known from European deposits. Stanleycaris: Stem-group Arthropoda. Radiodonta: Stanley Glacier; A basal hurdiid radiodont known from a variety of Cambrian deposits in North America.
The Burgess Shale is a series of sediment deposits spread over a vertical distance of hundreds of metres, extending laterally for at least 50 kilometres (30 mi). [18] The deposits were originally laid down on the floor of a shallow sea; during the Late Cretaceous Laramide orogeny, mountain-building processes squeezed the sediments upwards to their current position at around 2,500 metres (8,000 ...
Hallucigenia is a genus of lobopodian known from Cambrian aged fossils in Burgess Shale-type deposits in Canada and China, and from isolated spines around the world. [4] The generic name reflects the type species' unusual appearance and eccentric history of study; when it was erected as a genus, H. sparsa was reconstructed as an enigmatic animal upside down and back to front. [1]
Every once in a while, evolution stumbles across a good idea and really runs with it. Despite its odd appearance, the Cambrian creature Odaraia alata—an arthropod whose taco-shaped carapace ...
[10] [2] A nearly complete specimen of a juvenile Lyrarapax unguispinus measured only 18 mm (0.71 in), making it among the smallest radiodont specimens known, though adults reached a length of 8.3 cm (3.3 in) [2] [13] An isolated frontal appendage of a hurdiid with a length less than half that of the juvenile Lyrarapax is known, but it is not ...
This animal's body was very long, and had extreme segmentation compared to other Cambrian arthropods, with over 100 distinct segments. In total this creature had about 110 pairs of biramous limbs, the most of any Cambrian-aged arthropod. Covering the head of this creature was a large carapace that resembles an arch or other curved structure ...
The genus name Kylinxia refers to a mixture of arthropod characters; kylin is derived from the chimeric creature in Chinese mythology, while xia (蝦) is a Chinese word for shrimp-like arthropod. The species name zhang is after Yehui Zhang who contributed the additional specimens (paratypes).