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Macrorhizodus
''Macrorhizodus'' is an extinct genus of Mackerel shark which lived during the early to middle Eocene epoch of the Paleogene period. It is often considered ancestral to ''Isurus'' and sometimes considered part of it. ''Macrorhizodus'' is also likely ancestral to ''Cosmopolitodus''. It seems to be related to ''Isurolamna''. It is known from isolated teeth and vertebral centra as well as at least two associated dentitions. It is an incredibly widespread shark, known from every continent except Australia. This includes a report from Antarctica. Species The genus is composed of the following species: This genus appears to have undergone anagenesis Anagenesis is the gradual evolution of a species that continues to exist as an interbreeding population. This contrasts with cladogenesis, which occurs when there is branching or splitting, leading to two or more lineages and resulting in separate ..., making it difficult to draw lines between species. Some authors prefer to lump and othe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Macrorhizodus Americana
''Macrorhizodus'' is an extinct genus of Mackerel shark which lived during the early to middle Eocene epoch of the Paleogene period. It is often considered ancestral to ''Isurus'' and sometimes considered part of it. ''Macrorhizodus'' is also likely ancestral to ''Cosmopolitodus''. It seems to be related to ''Isurolamna''. It is known from isolated teeth and vertebral centra as well as at least two associated dentitions. It is an incredibly widespread shark, known from every continent except Australia. This includes a report from Antarctica. Species The genus is composed of the following species: This genus appears to have undergone anagenesis Anagenesis is the gradual evolution of a species that continues to exist as an interbreeding population. This contrasts with cladogenesis, which occurs when there is branching or splitting, leading to two or more lineages and resulting in separate ..., making it difficult to draw lines between species. Some authors prefer to lump and othe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Macrorhizodus Falcatus
''Macrorhizodus'' is an extinct genus of Mackerel shark which lived during the early to middle Eocene epoch of the Paleogene period. It is often considered ancestral to ''Isurus'' and sometimes considered part of it. ''Macrorhizodus'' is also likely ancestral to ''Cosmopolitodus''. It seems to be related to ''Isurolamna''. It is known from isolated teeth and vertebral centra as well as at least two associated dentitions. It is an incredibly widespread shark, known from every continent except Australia. This includes a report from Antarctica. Species The genus is composed of the following species: This genus appears to have undergone anagenesis Anagenesis is the gradual evolution of a species that continues to exist as an interbreeding population. This contrasts with cladogenesis, which occurs when there is branching or splitting, leading to two or more lineages and resulting in separate ..., making it difficult to draw lines between species. Some authors prefer to lump and oth ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Macrorhizodus Praecursor
''Macrorhizodus'' is an extinct genus of Mackerel shark which lived during the early to middle Eocene epoch of the Paleogene period. It is often considered ancestral to ''Isurus'' and sometimes considered part of it. ''Macrorhizodus'' is also likely ancestral to ''Cosmopolitodus''. It seems to be related to ''Isurolamna''. It is known from isolated teeth and vertebral centra as well as at least two associated dentitions. It is an incredibly widespread shark, known from every continent except Australia. This includes a report from Antarctica. Species The genus is composed of the following species: This genus appears to have undergone anagenesis Anagenesis is the gradual evolution of a species that continues to exist as an interbreeding population. This contrasts with cladogenesis, which occurs when there is branching or splitting, leading to two or more lineages and resulting in separate ..., making it difficult to draw lines between species. Some authors prefer to lump and oth ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Macrorhizodus Nolfi
''Macrorhizodus'' is an extinct genus of Mackerel shark which lived during the early to middle Eocene epoch of the Paleogene period. It is often considered ancestral to ''Isurus'' and sometimes considered part of it. ''Macrorhizodus'' is also likely ancestral to ''Cosmopolitodus''. It seems to be related to ''Isurolamna''. It is known from isolated teeth and vertebral centra as well as at least two associated dentitions. It is an incredibly widespread shark, known from every continent except Australia. This includes a report from Antarctica. Species The genus is composed of the following species: This genus appears to have undergone anagenesis Anagenesis is the gradual evolution of a species that continues to exist as an interbreeding population. This contrasts with cladogenesis, which occurs when there is branching or splitting, leading to two or more lineages and resulting in separate ..., making it difficult to draw lines between species. Some authors prefer to lump and oth ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lamnidae
The Lamnidae are the family of mackerel sharks known as white sharks. They are large, fast-swimming predatory fish found in oceans worldwide, though prefer environments with colder water. The name of the family is formed from the Greek word ''lamna'', which means "fish of prey", and was derived from the Greek legendary creature, the Lamia.: ''A source-book of biological names and terms'', 1944, Edmund Carroll Jaeger These sharks have pointed snouts, spindle-shaped bodies, and large gill openings. The first dorsal fin is large, high, stiff and angular or somewhat rounded. The second dorsal and anal fins are minute. The caudal peduncle has a couple of less distinct keels. The teeth are gigantic. The fifth gill opening is in front of the pectoral fin and spiracles are sometimes absent. They are powerful, heavily built sharks, sometimes weighing nearly twice as much as other sharks of comparable length from other families. Many sharks in the family are among the fastest-swimming f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Isurolamna
''Isurolamna'' is an extinct genus of mackerel shark from the Paleogene period. It contains at least three species and a fourth is sometimes placed in it. It is thought to be closely related to ''Macrorhizodus'', ''Isurus'', and ''Cosmopolitodus''. ''Isurolamna'' arose in the Paleocene epoch during the Selandian age, and was extinct by the close of the Rupelian age of the Oligocene epoch The Oligocene ( ) is a geologic epoch of the Paleogene Period and extends from about 33.9 million to 23 million years before the present ( to ). As with other older geologic periods, the rock beds that define the epoch are well identified but th .... Some features which define this genus include a small, elliptical foramen (hole) in the middle of the lingual side of the root, triangular cusps except on lower interior teeth, and a relatively thick root with nearly vertical margins. The genus has a complicated taxonomic past. Species The following species are ascribed to the genus: Referenc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ypresian
In the geologic timescale the Ypresian is the oldest age (geology), age or lowest stage (stratigraphy), stratigraphic stage of the Eocene. It spans the time between , is preceded by the Thanetian Age (part of the Paleocene) and is followed by the Eocene Lutetian Age. The Ypresian is consistent with the lower Eocene. Events The Ypresian Age begins during the throes of the Paleocene–Eocene Thermal Maximum (PETM). The Fur Formation in Denmark, the Messel shales in Germany, the Oise amber of France and Cambay amber of India are of this age. The Eocene Okanagan Highlands are an uplands subtropical to temperate series of lakes from the Ypresian. Stratigraphic definition The Ypresian Stage was introduced in scientific literature by Belgium, Belgian geologist André Hubert Dumont in 1850. The Ypresian is named after the Flanders, Flemish city of Ypres in Belgium (spelled ''Ieper'' in Dutch). The definitions of the original stage were totally different from the modern ones. The Ypresi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
South Carolina
)''Animis opibusque parati'' ( for, , Latin, Prepared in mind and resources, links=no) , anthem = " Carolina";" South Carolina On My Mind" , Former = Province of South Carolina , seat = Columbia , LargestCity = Charleston , LargestMetro = Greenville (combined and metro) Columbia (urban) , BorderingStates = Georgia, North Carolina , OfficialLang = English , population_demonym = South Carolinian , Governor = , Lieutenant Governor = , Legislature = General Assembly , Upperhouse = Senate , Lowerhouse = House of Representatives , Judiciary = South Carolina Supreme Court , Senators = , Representative = 6 Republicans1 Democrat , postal_code = SC , TradAbbreviation = S.C. , area_rank = 40th , area_total_sq_mi = 32,020 , area_total_km2 = 82,932 , area_land_sq_mi = 30,109 , area_land_km2 = 77,982 , area_water_sq_mi = 1,911 , area_water_km2 = 4,949 , area_water_percent = 6 , population_rank = 23rd , population_as_of = 2022 , 2010Pop = 5282634 , population ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Shortfin Mako Shark
The shortfin mako shark (; ; ''Isurus oxyrinchus''), also known as the blue pointer or bonito shark, is a large mackerel shark. It is commonly referred to as the mako shark, as is the longfin mako shark (''Isurus paucus''). The shortfin mako can reach a size of in length and weigh . The species is classified as Endangered by the IUCN. Etymology "Mako" comes from the Māori language, meaning either the shark or a shark tooth. Following the Māori language, "mako" in English is both singular and plural. The word may have originated in a dialectal variation, as it is similar to the common words for shark in a number of Polynesian languages—''makō'' in the Kāi Tahu Māori dialect, ''mangō'' in other Māori dialects, "mago" in Samoan, ''ma'o'' in Tahitian, and ''mano'' in Hawaiian. The first written usage is in Lee and Kendall's ''Grammar and vocabulary of the language of New Zealand'' (1820), which simply states, "Máko; A certain fish". Richard Taylor's ''A leaf from t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Anagenesis
Anagenesis is the gradual evolution of a species that continues to exist as an interbreeding population. This contrasts with cladogenesis, which occurs when there is branching or splitting, leading to two or more lineages and resulting in separate species. Anagenesis does not always lead to the formation of a new species from an ancestral species. When speciation does occur as different lineages branch off and cease to interbreed, a core group may continue to be defined as the original species. The evolution of this group, without extinction or species selection, is anagenesis. Hypotheses One hypothesis is that during the speciation event in anagenetic evolution, the original populations will increase quickly, and then rack up genetic variation over long periods of time by mutation and recombination in a stable environment. Other factors such as selection or genetic drift will have such a significant effect on genetic material and physical traits that a species can be acknow ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dakhla, Western Sahara
Dakhla ( ar, الداخلة, Berber: Eddaxla / ⴷⴷⴰⵅⵍⴰ, es, Dajla, Villa Cisneros) is a city in the disputed territory of Western Sahara, currently occupied by Morocco. It is the capital of the claimed Moroccan administrative region Dakhla-Oued Ed-Dahab. It has a population of 106,277 and is on a narrow peninsula of the Atlantic Coast, the Río de Oro Peninsula, about south of Laayoune. History The area has been inhabited by Berbers since ancient times. Oulad Dlim is an Arab tribe of Himyari from Yemen that settled in the Sahara in the twelfth century. Dakhla was expanded by Spanish settlers during the expansion of their empire. The Spanish interest in the desert coast of Western Africa's Sahara arose as the result of fishing carried out from the nearby Canary Islands by Spanish fishers and as a result of the Barbary pirates menace. Spanish fishers were seal fur traders and hunters, fishers and whalers along the Saharan coast from Dakhla to Cabo Blanco ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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