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Paleoscolecid
The palaeoscolecids are a group of extinct ecdysozoan worms resembling armoured priapulids. They are known from the Lower Cambrian to the late Silurian; they are mainly found as disarticulated sclerites, but are also preserved in many of the Cambrian lagerstätten. They take their name from the typifying genus ''Palaeoscolex''. Other genera include ''Cricocosmia'' from the Lower Cambrian Chengjiang biota. Morphology Palaeoscolecids bear an annulated trunk ornamented with circular patterns of phosphatic tesselating plates; a layered cuticle; and an armoured proboscis. They are long and narrow, and can reach tens of centimetres in length. Their cuticle is annulated, typically in complete rings, but sometimes the rings split or only encircle part of the trunk. Each annulus is essentially identical to its neighbours; the only trunk differentiation is at the anterior and posterior. The anterior is radially symmetrical, typically comprising an introvert, whereas the trunk is bilat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Burgess Shale
The Burgess Shale is a fossil-bearing deposit exposed in the Canadian Rockies of British Columbia, Canada. It is famous for the exceptional preservation of the soft parts of its fossils. At old (middle Cambrian), it is one of the earliest fossil beds containing soft-part imprints. The rock unit is a black shale and crops out at a number of localities near the town of Field in Yoho National Park Yoho National Park ( ) is a National Parks of Canada, national park of Canada. It is located within the Canadian Rockies, Rocky Mountains along the western slope of the Continental Divide of the Americas in southeastern British Columbia, bordered ... and the Kicking Horse Pass. Another outcrop is in Kootenay National Park 42 km to the south. History and significance The Burgess Shale was discovered by palaeontologist Charles Doolittle Walcott, Charles Walcott on 30 August 1909, towards the end of the season's fieldwork. He returned in 1910 with his sons, daughter, and wif ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Microdictyon
''Microdictyon'' is an extinct armoured worm-like animal coated with net-like scleritic plates, known from the Early Cambrian Maotianshan shale of Yunnan China and other parts of the world. ''Microdictyon'' is part of the ill-defined taxon – Lobopodia – that includes several other odd worm-like animals that resembling worm with legs, such as ''Hallucigenia'', ''Onychodictyon'', '' Cardiodictyon'', ''Luolishania'', and '' Paucipodia''. The isolated sclerites of ''Microdictyon'' are known from other Lower Cambrian deposits. ''Microdictyon'' sclerites appear to have moulted; one sclerite seems to have been preserved during ecdysis.Figured in ''Microdictyon sinicum'' (Chen, Hou and Lu, 1989) is typical. The wormlike animal has ten pairs of sclerites (suggestions that these may be eyes or eye-like structures have no weight) on the sides, matched to a pair of tentacle-like feet below. The head and posterior are tubular and featureless. Species composition *Type spe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Maotianshania
''Maotianshania cylindrica'' is an extinct worm-like creature of average size (up to long and wide). It occurs in the Lower Cambrian (Atdabanian) Chengjiang biota of Northeastern Yunnan, China. It is usually preserved as pink impression. The gut is a dark central zone. The anterior pharnyx and "collar", carry tiny sepia-colored teeth. The very back-end of the body has two small hooks. Etymology ''Maotianshania'' has been named for the Maotianshan shales, home to the famous Chengjiang Lagerstätte. Description The body of ''Maotianshania'' is worm-like, up to 4 cm in length and 2 mm wide, having 3-4 rings (or annuli) per mm. Like its relatives ''Cricocosmia'' and ''Palaeoscolex'', it is usually preserved as a very thin pink impression on the buff-colored matrix that is characteristic for the Maotianshan shales. The front of the body consists of a presumably protrusive and retractable elongate pharynx, armed with tooth- or spine-like outgrowths, arranged in rows a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Xystoscolex
''Xystoscolex'' is a genus of palaeoscolecidian worm known from the Sirius Passet, North Greenland The Northern Inspectorate of Greenland also known as North Greenland was a Danish inspectorate on Greenland consisting of the trading centers and missionary stations along the northwest coast of the island. History North Greenland was established .... References Prehistoric protostome genera Sirius Passet fossils Paleoscolecids {{cambrian-animal-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sirius Passet
Sirius Passet is a Cambrian Lagerstätte in Peary Land, Greenland. The Sirius Passet Lagerstätte was named after the Sirius sledge patrol that operates in North Greenland. It comprises six places in Nansen Land, on the east shore of J.P. Koch Fjord in the far north of Greenland. It was discovered in 1984 by A. Higgins of the Geological Survey of Greenland. A preliminary account was published by Simon Conway Morris and others in 1987 and expeditions led by J. S. Peel and Conway Morris have returned to the site several times between 1989 and the present. A field collection of perhaps 10,000 fossil specimens has been amassed. It is a part of the Buen Formation. Age The fauna is inevitably compared to that of the Burgess Shale, although it is probably ten to fifteen million years older – vs. ) – and more closely contemporaneous with the fauna of the Maotianshan shales from Chengjiang, which are dated to . Preservation The preservation of the Sirius Passet is traditionall ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chalazoscolex
''Chalazoscolex'' is a genus of palaeoscolecidian worm known from the Sirius Passet Sirius Passet is a Cambrian Lagerstätte in Peary Land, Greenland. The Sirius Passet Lagerstätte was named after the Sirius sledge patrol that operates in North Greenland. It comprises six places in Nansen Land, on the east shore of J.P. Koch F .... It had around 140 segments, each adorned with two rows of palaeoscolecid plates. Its body was organised into three transverse sections, the medial bearing three large sclerites acrosswise, the laterals bearing ridges. References Cambrian invertebrates Prehistoric protostome genera Fossil taxa described in 2010 Paleoscolecids {{cambrian-animal-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chalazoscolecidae
''Chalazoscolex'' is a genus of palaeoscolecidian worm known from the Sirius Passet Sirius Passet is a Cambrian Lagerstätte in Peary Land, Greenland. The Sirius Passet Lagerstätte was named after the Sirius sledge patrol that operates in North Greenland. It comprises six places in Nansen Land, on the east shore of J.P. Koch F .... It had around 140 segments, each adorned with two rows of palaeoscolecid plates. Its body was organised into three transverse sections, the medial bearing three large sclerites acrosswise, the laterals bearing ridges. References Cambrian invertebrates Prehistoric protostome genera Fossil taxa described in 2010 Paleoscolecids {{cambrian-animal-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
