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Proterocladus
''Proterocladus'' is a genus of green algae from the early Neoproterozoic (Tonian) and latest Mesoproterozoic (Stenian), known from the Nanfen Formation and Diaoyutai Formation in China and the Svanbergfjellet Formation in Norway. Alongside this, possible ''Proterocladus'' remains are known from the Nonesuch Formation, although their fragmentary state makes it unclear whether they belong to the genus. Description The later three species (''major'', ''minor'', ''hermannae'') are relatively similar, only being differentiated by size and accessory features. All these species have filaments composed of rows of single cells with occasional branches, with the individual cells being cylindrical, wikt:psilate, psilate (lacking ornamentation) and thin-walled, varying in length but much longer than wide. These cells often have septa (partitions) separating them, and the occasional branches often occur near a septum. The tips of the filaments are either rounded or capitate (ending in a br ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Svanbergfjellet Formation
The Svanbergfjellet Formation is a Formation (geology), geologic formation in Svalbard. It preserves eukaryotic fossils dating back to the Late Tonian Period (geology), period, around 790 Ma. Paleobiota After Butterfield et al, 1994. References {{reflist Geologic formations of Norway Tonian Neoproterozoic geology ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cladophorales Genera
Cladophorales are an order of green algae, in the class Ulvophyceae. The earliest known representative is ''Proterocladus antiquus'' from the Mesoproterozoic-Neoproterozoic boundary in North China. The order Cladophorales consists of filamentous macroalgae attached to a surface. The filaments are uniseriate (one cell thick) with multinucleate cells, and are unbranched or profusely branched. In some taxa, the filaments are modified into giant single cells, three-dimensional networks of branches, or pseudoparenchymatic clusters. Currently, Cladophorales has an expanded circumscription that includes Siphonocladales. Classification has been difficult, because the simple morphology has led to convergent evolution Convergent evolution is the independent evolution of similar features in species of different periods or epochs in time. Convergent evolution creates analogous structures that have similar form or function but were not present in the last comm .... The current hypothes ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Species
A species () is often defined as the largest group of organisms in which any two individuals of the appropriate sexes or mating types can produce fertile offspring, typically by sexual reproduction. It is the basic unit of Taxonomy (biology), classification and a taxonomic rank of an organism, as well as a unit of biodiversity. Other ways of defining species include their karyotype, DNA sequence, morphology (biology), morphology, behaviour, or ecological niche. In addition, palaeontologists use the concept of the chronospecies since fossil reproduction cannot be examined. The most recent rigorous estimate for the total number of species of eukaryotes is between 8 and 8.7 million. About 14% of these had been described by 2011. All species (except viruses) are given a binomial nomenclature, two-part name, a "binomen". The first part of a binomen is the name of a genus to which the species belongs. The second part is called the specific name (zoology), specific name or the specific ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Green Algae
The green algae (: green alga) are a group of chlorophyll-containing autotrophic eukaryotes consisting of the phylum Prasinodermophyta and its unnamed sister group that contains the Chlorophyta and Charophyta/ Streptophyta. The land plants ( Embryophytes) have emerged deep within the charophytes as a sister of the Zygnematophyceae. Since the realization that the Embryophytes emerged within the green algae, some authors are starting to include them. The completed clade that includes both green algae and embryophytes is monophyletic and is referred to as the clade Viridiplantae and as the kingdom Plantae. The green algae include unicellular and colonial flagellates, most with two flagella per cell, as well as various colonial, coccoid (spherical), and filamentous forms, and macroscopic, multicellular seaweeds. There are about 22,000 species of green algae, many of which live most of their lives as single cells, while other species form coenobia (colonies), long filaments ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Neoproterozoic
The Neoproterozoic Era is the last of the three geologic eras of the Proterozoic geologic eon, eon, spanning from 1 billion to 538.8 million years ago, and is the last era of the Precambrian "supereon". It is preceded by the Mesoproterozoic era and succeeded by the Paleozoic era of the Phanerozoic eon, and is further subdivided into three geologic period, periods, the Tonian, Cryogenian and Ediacaran. One of the most severe glaciation events known in the geologic record occurred during the Cryogenian period of the Neoproterozoic, when global ice sheets may have reached the equator and created a "Snowball Earth" lasting about 100 million years. The earliest fossils of complex life are found in the Tonian period in the form of ''Otavia'', a primitive sponge, and the earliest fossil evidence of metazoan evolutionary radiation, radiation are found in the Ediacaran period, which included the namesaked Ediacaran biota as well as the oldest definitive cnidarians and bilaterians in th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tonian
The Tonian (from , meaning "stretch") is the first geologic period of the Neoproterozoic era (geology), Era. It lasted from to Mya (million years ago). Instead of being based on stratigraphy, these dates are defined by the International Commission on Stratigraphy, ICS based on radiometric dating, radiometric chronometry. The Tonian is preceded by the Stenian Period of the Mesoproterozoic Era and followed by the Cryogenian. Rifting leading to the breakup of supercontinent Rodinia, which had formed in the mid-Stenian, occurred during this period, starting from 900 to 850 Mya. Biology The first putative metazoan (animal) fossils are dated to the middle to late Tonian ( 890-800 Mya). The fossils of ''Otavia antiqua'', which has been described as a primitive sponge by its discoverers and numerous other scholars, date back to about 800 mya. Even earlier sponge-like fossils have been reported in reefs dating back to 890 million years before the present, but their identity is highly ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mesoproterozoic
The Mesoproterozoic Era is a geologic era that occurred from . The Mesoproterozoic was the first era of Earth's history for which a fairly definitive geological record survives. Continents existed during the preceding era (the Paleoproterozoic), but little is known about them. The continental masses of the Mesoproterozoic were more or less the same ones that exist today, although their arrangement on the Earth's surface was different. Major events and characteristics The major events of this era are the breakup of the Columbia supercontinent, the formation of the Rodinia supercontinent, and the evolution of sexual reproduction. This era is marked by the further development of continental plates and plate tectonics. The supercontinent of Columbia broke up between 1500 and 1350 million years ago, and the fragments reassembled into the supercontinent of Rodinia around 1100 to 900 million years ago, on the time boundary between the Mesoproterozoic and the subsequent Neoprot ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stenian
The Stenian Period ( , from , meaning "narrow") is the final geologic period in the Mesoproterozoic Era and lasted from Mya to Mya (million years ago). Instead of being based on stratigraphy, these dates are defined chronometrically. The name derives from narrow polymetamorphic belts formed over this period. It is preceded by the Ectasian Period and followed by the Neoproterozoic era and the Tonian period. The supercontinent Rodinia assembled during the Stenian. It would last into the Tonian period before breaking up in the Cryogenian The Cryogenian (from , meaning "cold" and , romanized: , meaning "birth") is a geologic period that lasted from . It is the second of the three periods of the Neoproterozoic era, preceded by the Tonian and followed by the Ediacaran. The Cryoge .... This period includes the formation of the Keweenawan Rift at about 1100 Mya. Fossils of the oldest known sexually reproducing organism, '' Bangiomorpha pubescens'', first appeared in the Sten ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nanfen Formation
Nanfen District () is a district under the administration of the city of Benxi, Liaoning province, People's Republic of China. It has a total area of , and a population of approximately 55,500 people as of 2020. Administrative divisions There are two subdistricts and one town A town is a type of a human settlement, generally larger than a village but smaller than a city. The criteria for distinguishing a town vary globally, often depending on factors such as population size, economic character, administrative stat ... in the district. Subdistricts: * Tieshan Subdistrict (), Nanfen Subdistrict () The only town is Xiamatang () Townships: * Nanfen Township (), Sishanling Manchu Ethnic Township () References External linksNanfen District Government website(Chinese) County-level divisions of Liaoning Benxi {{liaoning-geo-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Diaoyutai Formation
The Senkaku Islands, known as the Diaoyu Islands in China and the Tiaoyutai Islands in Taiwan, are a group of uninhabited islands in the East China Sea, administered by Japan. They were historically known in the Western world as the Pinnacle Islands. The islands are located northeast of Taiwan, east of China, west of Okinawa Island, and north of the southwestern end of the Ryukyu Islands. The islands are the focus of a territorial dispute between Japan and China and between Japan and Taiwan. China claims the discovery and ownership of the islands from the 14th century, while Japan maintained ownership of the islands from 1895 until its surrender at the end of World War II. The United States administered the islands as part of the United States Civil Administration of the Ryukyu Islands from 1945 until 1972, when the islands returned to Japanese control under the Okinawa Reversion Agreement between the United States and Japan. The discovery of potential undersea oil reserves i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nonesuch Formation
__NOTOC__ Nonesuch may refer to: Plants * ''Lychnis chalcedonica'', a wildflower * ''Medicago lupulina'', a wildflower Places and structures *Nonesuch, Kentucky *Nonesuch Island, Bermuda *Nonesuch Mine, Michigan *Nonesuch Palace, mis-spelling of Nonsuch, English royal palace *Nonesuch River, Maine *Nonesuch River Golf Course, Maine Other uses *Nonesuch Press, publisher in London 1922–1960s *Nonesuch Records, American record company *''The Nonesuch ''The Nonesuch'' is a Regency romance novel by Georgette Heyer. The story is set in 1816/1817.See http://www.georgette-heyer.com/chron.html Plot summary Sir Waldo Hawkridge, known in London society as 'the Nonesuch' for his sporting abilities a ...'', 1962 novel by Georgette Heyer See also * Nonsuch (other) {{Disambiguation, geo, plant ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Psilate
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