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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 ...
T. gregarium fossil (part and counterpart). Amateur collector Francis Tully [] found the first of these fossils in 1955 in a fossil bed known as the Mazon Creek formation.He took the strange creature to the Field Museum of Natural History, but paleontologists were stumped as to which phylum Tullimonstrum belonged in. [7] The species Tullimonstrum gregarium ("Tully's common monster"), as these ...
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.
Amplectobelua [3] 1995 Maotianshan Shales. Burgess Shale. Houcaris [13] 2021 Maotianshan Shales. Pioche Shale. Pyramid Shale. Lyrarapax [14] 2014 Maotianshan Shales: Caryosyntrips [15] 2010 Burgess Shale. Wheeler Shale. Marjum Formation. Valdemiedes Formation. Tamisiocaris [16] 2010 Sirius Passet: Opabinia [17] 1912 Burgess Shale: Utaurora [18 ...
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[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 ...
Trilobites range in length from minute (less than 1 millimetre (0.039 in)) to very large (over 70 centimetres (28 in)), with an average size range of 3–10 cm (1.2–3.9 in). Supposedly the smallest species is Acanthopleurella stipulae with a maximum of 1.5 millimetres (0.059 in). [ 64 ]
Ottoia is a stem-group archaeopriapulid worm known from Cambrian fossils. [3] Although priapulid-like worms from various Cambrian deposits are often referred to Ottoia on spurious grounds, the only clear Ottoia macrofossils come from the Burgess Shale of British Columbia , which was deposited 508 million years ago . [ 1 ]