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Charniidae
Charniidae is a family of rangeomorphs. It is the only non-monotypic family of Rangeomorpha. Distribution From the Ediacaran of Australia, Canada, Russia and the United Kingdom, to the Cambrian of Canada. Taxonomy The family presents 5 genera: * †''Beothukis'' * †'' Bomakellia'' * †''Charnia'' * †''Culmofrons'' * †''Paracharnia'' Gallery Bomakellia_kelleri.JPG , Artists interpretation of the enigmatic '' Bomakellia kelleri''. Charnia.png , Fossil specimen of '' Charnia masoni''. Paracharnia_dengyingensis.png , Artists interpretation of '' Paracharnia dengyingensis''. See also *''Rangea ''Rangea'' is a frond-like Ediacaran fossil with six-fold radial symmetry. It is the type genus of the rangeomorphs. ''Rangea'' was the first complex Precambrian macrofossil named and described anywhere in the world. ''Rangea'' was a centimetre- ...'' References Rangeomorpha Charniidae Ediacaran life {{Ediacaran-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Beothukis
''Beothukis mistakensis'' is a rare fossil frond-like member of the Rangeomorpha, described from the Ediacaran of Mistaken Point, Newfoundland. It had been identified since 1992, referred in papers as a "spatulate frond" or "flat recliner", but not formally described until 2009. The original fossils from which the genus has been described are still ''in situ'', but replicas are preserved at the Memorial University of Newfoundland and at the Oxford University Museum of Natural History. Claims of a stem have been contentious, and based largely on structures that have subsequently been determined to be erosional scours, and is so considered to be a recliner Morphology ''Beothukis'' appears as a frond composed of two asymmetrical rows of branches that depart from a central growth axis, 12.5–15.5 cm long and 4.5–6 cm wide. Secondary growth is present around the tip. Secondary order units cross the primary order axes as is common in the Charnida The alternations are i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bomakellia
''Bomakellia kelleri'' is a species of poorly understood Ediacaran fossil organism represented by only one specimen discovered in the Ust'-Pinega Formation of the Syuzma River from rocks dated 555 million years old. ''Bomakellia'' was originally interpreted as an early Arthropod. A study by B. M. Waggoner even concluded that the organism was a primitive anomalocarid and erroneously identified the ridges of supposed Cephalon as being eyes making ''Bomakellia'' the oldest known animal with vision. But this hypothesis has not reached acceptance, nor acknowledgement. A closer examination of the specimen has identified a tetraradial symmetry in the body, and a frond-like morphology which closely resembles that of ''Rangea'' – the current interpretation of ''Bomakellia'' is as a rangeomorph frond, which could possibly mean that it's closely related to the Chinese ''Paracharnia''. See also * List of Ediacaran genera * Charniidae Charniidae is a family of rangeomorphs. It is th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Culmofrons
''Beothukis mistakensis'' is a rare fossil frond-like member of the Rangeomorpha, described from the Ediacaran of Mistaken Point, Newfoundland. It had been identified since 1992, referred in papers as a "spatulate frond" or "flat recliner", but not formally described until 2009. The original fossils from which the genus has been described are still ''in situ'', but replicas are preserved at the Memorial University of Newfoundland and at the Oxford University Museum of Natural History. Claims of a stem have been contentious, and based largely on structures that have subsequently been determined to be erosional scours, and is so considered to be a recliner Morphology ''Beothukis'' appears as a frond composed of two asymmetrical rows of branches that depart from a central growth axis, 12.5–15.5 cm long and 4.5–6 cm wide. Secondary growth is present around the tip. Secondary order units cross the primary order axes as is common in the Charnida The alternations are i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paracharnia
''Paracharnia'' is a reassessed genus of a fossil reported by Ding and Chen (1981). It is the first Ediacaran metazoan fossilized remains found in China, taken from the Shibantan Member, Dengying Formation, Sinian System in the Eastern Yangtze Gorge, Hubei Province. It was initially classified as ''Charnia dengyingensis'', but Sun Weiguo in 1986, comparing this to findings from Charnwood in England and the Ediacara assemblage of South Australia South Australia (commonly abbreviated as SA) is a state in the southern central part of Australia. It covers some of the most arid parts of the country. With a total land area of , it is the fourth-largest of Australia's states and territories ..., identified it as a new genera. ''Paracharnia'' is a pennatulid within the taxon of Rangeomorpha. It is closely associated with macroscopic algal remains of ''Vendotaenia'' and dense Cambrian shelly fossil deposits, suggesting its paleontological relevance. The original fossil extraction ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bomakellia Kelleri
''Bomakellia kelleri'' is a species of poorly understood Ediacaran fossil organism represented by only one specimen discovered in the Ust'-Pinega Formation of the Syuzma River from rocks dated 555 million years old. ''Bomakellia'' was originally interpreted as an early Arthropod. A study by B. M. Waggoner even concluded that the organism was a primitive anomalocarid and erroneously identified the ridges of supposed Cephalon as being eyes making ''Bomakellia'' the oldest known animal with vision. But this hypothesis has not reached acceptance, nor acknowledgement. A closer examination of the specimen has identified a tetraradial symmetry in the body, and a frond-like morphology which closely resembles that of ''Rangea'' – the current interpretation of ''Bomakellia'' is as a rangeomorph frond, which could possibly mean that it's closely related to the Chinese ''Paracharnia''. See also * List of Ediacaran genera * Charniidae Charniidae is a family of rangeomorphs. It is the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Charnia Masoni
''Charnia'' is a genus of frond-like lifeforms belonging to the Ediacaran biota with segmented, leaf-like ridges branching alternately to the right and left from a zig-zag medial suture (thus exhibiting glide reflection, or opposite isometry). The genus ''Charnia'' was named after Charnwood Forest in Leicestershire, England, where the first fossilised specimen was found. ''Charnia'' is significant because it was the first Precambrian fossil to be recognized as such. The living organism grew on the sea floor and is believed to have fed on nutrients in the water. Despite ''Charnia'' fern-like appearance, it is not a photosynthetic plant or alga because the nature of the fossilbeds where specimens have been found implies that it originally lived in deep water, well below the photic zone where photosynthesis can occur. Diversity Several ''Charnia'' species were described but only the type species ''C. masoni'' is considered valid. Some specimens of ''C. masoni'' were described as ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rangeomorph
The rangeomorphs are a form taxon of frondose Ediacaran fossils that are united by a similarity to ''Rangea''. Some researchers, such as Pflug and Narbonne, suggest that a natural taxon Rangeomorpha may include all similar-looking fossils. Rangeomorphs appear to have had an effective reproductive strategy, based on analysis of the distribution pattern of ''Fractofusus misrai'', which consisted of sending out a waterborne asexual propagule to a distant area, and then spreading rapidly from there, just as plants today spread by stolons or runners. Rangeomorphs are a key part of the Ediacaran biota, which survived about 30 million years, until the base of the Cambrian, which was . They were especially abundant in the early Ediacaran Mistaken Point assemblage found in Newfoundland. Body plan Rangeomorphs consist of branching "frond" elements, each a few centimetres long, each of which is composed of many smaller branching tubes held up by a semi-rigid organic skeleton. This self ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ediacaran
The Ediacaran Period ( ) is a geological period that spans 96 million years from the end of the Cryogenian Period 635 million years ago (Mya), to the beginning of the Cambrian Period 538.8 Mya. It marks the end of the Proterozoic Eon, and the beginning of the Phanerozoic Eon. It is named after the Ediacara Hills of South Australia. The Ediacaran Period's status as an official geological period was ratified in 2004 by the International Union of Geological Sciences (IUGS), making it the first new geological period declared in 120 years. Although the period takes its name from the Ediacara Hills where geologist Reg Sprigg first discovered fossils of the eponymous Ediacaran biota in 1946, the type section is located in the bed of the Enorama Creek within Brachina Gorge in the Flinders Ranges of South Australia, at . The Ediacaran marks the first appearance of widespread multicellular fauna following the end of Snowball Earth glaciation events, the so-called Ediacaran ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Family (biology)
Family ( la, familia, plural ') is one of the eight major hierarchical taxonomic ranks in Linnaean taxonomy. It is classified between order and genus. A family may be divided into subfamilies, which are intermediate ranks between the ranks of family and genus. The official family names are Latin in origin; however, popular names are often used: for example, walnut trees and hickory trees belong to the family Juglandaceae, but that family is commonly referred to as the "walnut family". What belongs to a family—or if a described family should be recognized at all—are proposed and determined by practicing taxonomists. There are no hard rules for describing or recognizing a family, but in plants, they can be characterized on the basis of both vegetative and reproductive features of plant species. Taxonomists often take different positions about descriptions, and there may be no broad consensus across the scientific community for some time. The publishing of new data and opi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
