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Estimated to reach 34.2–37.8 cm (13.5–14.9 in) long excluding the frontal appendages and tail fan, [4] Anomalocaris is one of the largest animals of the Cambrian, and thought to be one of the earliest examples of an apex predator, [5] [6] though others have been found in older Cambrian lagerstätten deposits.
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Cambroernids encompass three particular types of enigmatic animals first appearing in the Cambrian: Herpetogaster (the type genus), Phlogites, and the Eldonioidea.They are united by a set of common features including at least one pair of bifurcated or divided oral tentacles, and a large stomach and narrower intestine enclosed together in a clockwise-coiled sac.
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]
Cambrian Stage 4 is the still unnamed fourth stage of the Cambrian and the upper stage of Cambrian Series 2. It follows Cambrian Stage 3 and lies below the Wuliuan. The lower boundary has not been formally defined by the International Commission on Stratigraphy. One proposal is the first appearance of two trilobite genera, Olenellus or Redlichia.
Wiwaxia fossils—mainly isolated scales, but sometimes complete, articulated fossils—are known from early Cambrian and middle Cambrian fossil deposits across the globe. [ 4 ] [ 6 ] [ 7 ] The living animal would have measured up to 5 centimetres (2 in) when fully grown, although a range of juvenile specimens are known, the smallest being 2 ...
Radiodonta (also known as radiodonts, [1] [2] [3] radiodontans, [4] [5] radiodontids, [6] anomalocarids, [7] or anomalocaridids, [8] [9] [10] although the last two originally refer to the family Anomalocarididae, which previously included all species of this order but is now restricted to only a few species.
T. distos, though incomplete, is the longest with 3 cm body length and bears at least nine pairs of legs. [18] Hallucigenia species are highly diverse in body sizes, H. fortis is only about 1 cm long, H. hongmeia is intermediate with about 3 cm in length, and H. sparsa being the longest measuring 5.5 cm. [7] [19]