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Rhombocorniculum
''Rhombocorniculum'' is a species of small shelly fossil comprising twisted ornamented cones. It has been described from the Comely limestone and elsewhere. ''R. cancellatum'' straddles the Atdabanian/Botomian boundary. The structure of its inner layer suggests that its phosphatic fibres formed within a flexible organic matrix. Taxonomy Three species are recognized — in stratigraphic succession: ''R. insolutum'', ''R. cancellatum'' (=''R. walliseri''), and ''R. spinosus'' (=''Rushtonites spinosus''). Landing (1995) refers ''R. insolutum'' to the strictocorniculids, along with ''Rushtonites''. Hinz (1987) considers ''insolutum'' to fall within the variability seen in ''cancellatum''. Affinity Based on details of the ornament and construction, ''Rhombocorniculum'' is interpreted as the spines of a ''Hallucigenia ''Hallucigenia'' is a genus of Cambrian animal resembling worms, known from articulated fossils in Burgess Shale-type deposits in Canada and China, and fro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rushtonites
''Mongolitubulus'' is a form genus encapsulating a range of ornamented conical small shelly fossils of the Cambrian, Cambrian period. It is potentially synonymous with ''Rushtonites'', ''Tubuterium'' and certain species of ''Rhombocorniculum'', and owing to the similarity of the genera, they are all dealt with herein. Organisms that bore ''Mongolitubulus''-like projections include trilobites, bradoriid arthropods and hallucigeniid lobopodians. Morphology The fossils consist of round, slender, pointed, spines with a slight curvature, and are covered with short rhomboid processes that spiral around the spine surface, forming a regular mosaic with a 60° angle of intersection. Spines vary from sub-millimetric up to two centimetres in length, but do not show any growth lines, suggesting that they were moulted and replaced. Species are defined on the basis of the ornamentation, which may of course be convergent evolution, convergent. Spines of ''Rhombocorniculum cancellatum'' have ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mongolitubulus
''Mongolitubulus'' is a form genus encapsulating a range of ornamented conical small shelly fossils of the Cambrian period. It is potentially synonymous with ''Rushtonites'', ''Tubuterium'' and certain species of ''Rhombocorniculum'', and owing to the similarity of the genera, they are all dealt with herein. Organisms that bore ''Mongolitubulus''-like projections include trilobites, bradoriid arthropods and hallucigeniid lobopodians. Morphology The fossils consist of round, slender, pointed, spines with a slight curvature, and are covered with short rhomboid processes that spiral around the spine surface, forming a regular mosaic with a 60° angle of intersection. Spines vary from sub-millimetric up to two centimetres in length, but do not show any growth lines, suggesting that they were moulted and replaced. Species are defined on the basis of the ornamentation, which may of course be convergent. Spines of ''Rhombocorniculum cancellatum'' have a similar surface ornamentation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Comely Limestone
Comely (foaled 1912) was an American Thoroughbred racehorse. She was bred by James R. Keene who sold her in a package deal to James Butler, owner of the Empire City Race Track. Butler had bought the entire 1912 crop produced by Keene's Castleton Stud. Background Comely's sire was Disguise who raced in England for owner/breeder James R. Keene. Disguise was the winner of the 1900 Jockey Club Stakes and ran third in that year's Epsom Derby. Both her grandsire and damsire were elected to the U.S. Racing Hall of Fame. Comely is best remembered from her racing days for a remarkable performance as a two-year-old when she defeated older male horses to win the first running of the Fall Highweight Handicap in 1914. Going into 2019, she remains the only two-year-old to win the Fall Highweight Handicap and one of only a few two-year-olds to defeat older horses in a major stakes race. The Comely Stakes at Aqueduct Racetrack in Queens, New York New York most commonly refers to: * N ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hallucigenia
''Hallucigenia'' is a genus of Cambrian animal resembling worms, known from articulated fossils in Burgess Shale-type deposits in Canada and China, and from isolated spines around the world. 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. ''Hallucigenia'' was later recognized as a lobopodian, a grade of Paleozoic panarthropods from which the velvet worms, water bears, and arthropods arose. Description ''Hallucigenia'' is a long tubular animal with up to ten pairs of slender legs ( lobopods). The first 2 or 3 leg pairs are slender and featureless, while the remaining 7 or 8 pairs each terminate with 1 or 2 claws. Above the trunk region are 7 pairs of rigid conical sclerites (spines) corresponding to the 3rd–9th leg pairs. The trunk is either featureless (''H. sparsa'') or divided by heteronomous annula ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Prehistoric Animal Genera
Prehistory, also known as pre-literary history, is the period of human history between the use of the first stone tools by hominins 3.3 million years ago and the beginning of recorded history with the invention of writing systems. The use of symbols, marks, and images appears very early among humans, but the earliest known writing systems appeared 5000 years ago. It took thousands of years for writing systems to be widely adopted, with writing spreading to almost all cultures by the 19th century. The end of prehistory therefore came at very different times in different places, and the term is less often used in discussing societies where prehistory ended relatively recently. In the early Bronze Age, Sumer in Mesopotamia, the Indus Valley Civilisation, and ancient Egypt were the first civilizations to develop their own scripts and to keep historical records, with their neighbors following. Most other civilizations reached the end of prehistory during the following Iron Age. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
