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Trichechinae
Trichechidae is a family of sirenians that includes all living manatees and several extinct genera. Systematics TRICHECHIDAE *MiosireninaeM. Voss. 2014. On the invalidity of Halitherium schinzii Kaup, 1838 (Mammalia, Sirenia), with comments on systematic consequences. Zoosystematics and Evolution 90(1):87-93 **''Anomotherium'' ***''Anomotherium langewieschei'' **''Miosiren'' ***''Miosiren canhami'' ***''Miosiren kocki'' *Trichechinae **''Trichechus'' ***''Trichechus inunguis'' - Amazonian Manatee ***''Trichechus manatus'' - West Indian Manatee ***''Trichechus senegalensis'' - African Manatee ***''Trichechus hesperamazonicus'' **''Potamosiren'' ***''Potamosiren magdalensis'' **''Ribodon ''Ribodon'' is an extinct genus of manatee that lived around South America (Ituzaingó Formation, then described as Entrerriana Formation, Argentina, Solimões Formation, Brazil and Urumaco Formation, Urumaco, Venezuela) during the Tortonian (May ...'' ***''Ribodon limbatus'' References ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sirenians
The Sirenia (), commonly referred to as sea-cows or sirenians, are an order (biology), order of fully aquatic, herbivorous mammals that inhabit swamps, rivers, estuaries, marine wetlands, and coastal marine waters. The Sirenia currently comprise two distinct family (biology), families: Dugongidae (the dugong and the now extinct Steller's sea cow) and Trichechidae (manatees, namely the Amazonian manatee, West Indian manatee, and West African manatee) with a total of four species. The Protosirenidae (Eocene sirenians) and Prorastomidae (terrestrial sirenians) families are extinct. Sirenians are classified in the clade Paenungulata, alongside the elephants and the hyraxes, and evolved in the Eocene 50 million years ago (mya). The Dugongidae Genetic divergence, diverged from the Trichechidae in the late Eocene or early Oligocene (30–35 mya). Sirenians grow to between in length and in weight. The historic Steller's sea cow was the largest known sirenian to have lived, and could r ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Late Oligocene
The Chattian is, in the geologic timescale, the younger of two ages or upper of two stages of the Oligocene Epoch/Series. It spans the time between . The Chattian is preceded by the Rupelian and is followed by the Aquitanian (the lowest stage of the Miocene). Stratigraphic definition The Chattian was introduced by Austrian palaeontologist Theodor Fuchs in 1894. Fuchs named the stage after the Chatti, a Germanic tribe.Berry, Edward W"The Mayence Basin, a Chapter of Geologic History" ''The Scientific Monthly'', Vol. 16, No. 2, February 1923. pp. 114. Retrieved March 18, 2020. The original type locality was near the German city of Kassel. The base of the Chattian is at the extinction of the foram genus ''Chiloguembelina'' (which is also the base of foram biozone P21b). An official GSSP for the Chattian Stage was ratified in October of 2016. The top of the Chattian Stage (which is the base of the Aquitanian Stage, Miocene Series and Neogene System) is at the first appearance of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Amazonian Manatee
The Amazonian manatee (''Trichechus inunguis'') is a species of manatee that lives in the Amazon Basin in Brazil, Peru, Colombia and Ecuador. It has thin, wrinkled brownish or gray colored skin, with fine hairs scattered over its body and a white chest patch. It is the smallest of the three extant species of manatee.''Trials of a Primatologist.'' - smithsonianmag.com. Accessed March 16, 2008. Taxonomy The specific name, ''inunguis'' is Latin for "nailless." The genus name ''Trichechus'', comes from Latin meaning "hair", referencing the whiskers around the manatee's mouth.Physical characteristics The Amazonian manatee is the smallest member of the manatee family and can be distinguished b ...[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mammal Families
Mammals () are a group of vertebrate animals constituting the class Mammalia (), characterized by the presence of mammary glands which in females produce milk for feeding (nursing) their young, a neocortex (a region of the brain), fur or hair, and three middle ear bones. These characteristics distinguish them from reptiles (including birds) from which they diverged in the Carboniferous, over 300 million years ago. Around 6,400 extant species of mammals have been described divided into 29 orders. The largest orders, in terms of number of species, are the rodents, bats, and Eulipotyphla (hedgehogs, moles, shrews, and others). The next three are the Primates (including humans, apes, monkeys, and others), the Artiodactyla (cetaceans and even-toed ungulates), and the Carnivora (cats, dogs, seals, and others). In terms of cladistics, which reflects evolutionary history, mammals are the only living members of the Synapsida (synapsids); this clade, together with Saurops ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ribodon
''Ribodon'' is an extinct genus of manatee that lived around South America (Ituzaingó Formation, then described as Entrerriana Formation, Argentina, Solimões Formation, Brazil and Urumaco Formation, Urumaco, Venezuela) during the Tortonian (Mayoan to Huayquerian in the South American land mammal ages). The type species is ''R. limbatus''. Ribodon is considered the direct ancestor of the Trichechus Manatees (family Trichechidae, genus ''Trichechus'') are large, fully aquatic, mostly herbivorous marine mammals sometimes known as sea cows. There are three accepted living species of Trichechidae, representing three of the four living species ... genus to which all modern manatees belong and was the first manatee to exhibit supernumerary molars that were replaced throughout life, indicating a diet of abrasive plants. Ribodon is hypothesized to have inhabited both coastal and inland freshwater regions; however, in which of the two it originated is unknown. References Pr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Potamosiren
''Potamosiren'' is an extinct genus of manatee from the Middle Miocene (Laventan) Honda Group of Colombia. Phylogeny A 2014 cladistic analysis of extinct sirenians recovers ''Potamosiren'' as a close relative of modern manatees.M. Voss. 2014. On the invalidity of Halitherium schinzii Kaup, 1838 (Mammalia, Sirenia), with comments on systematic consequences. Zoosystematics and Evolution 90(1):87-93 See also * Evolution of sirenians Sirenia is the order of placental mammals which comprises modern "sea cows" (manatees and the Dugong) and their extinct relatives. They are the only extant herbivorous marine mammals and the only group of herbivorous mammals to have become com ... References Prehistoric placental genera Miocene sirenians Miocene mammals of South America Laventan Neogene Colombia Fossils of Colombia Honda Group, Colombia Fossil taxa described in 1951 {{Paleo-sirenian-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trichechus Hesperamazonicus
''Trichechus hesperamazonicus'', the western Amazonian manatee, is an extinct species of manatee that lived about 40 thousand years ago in the Madeira River, in the Brazilian state of Rondonia. It is known from this single locality, with possible occurrences in the Brazilian state of Acre. Description ''Trichechus hesperamazonicus'' is known by two fragmentary mandibles and part of the palate. Compared with other manatees, it has a wide space between the posterior lower tooth row and ascending ramus of dentary, where the buccinator muscle is located, and a wide ascending ramus of the mandible, which covers the posterior end of the tooth row. It also shares some characteristics with living species, as relatively few large teeth and few mental foramina as '' T. manatus'' and '' T. senegalensis'' (in contrast with the many smaller teeth and many mental foramina of '' T. inunguis'') and a straight and shallow mandibular symphysis as '' T. inunguis'' and '' T. senegalensis'' (in con ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
African Manatee
The African manatee (''Trichechus senegalensis''), also known as the West African manatee, is a species of manatee that inhabits much of the western region of Africa – from Senegal to Angola. It is the only manatee species to be found in the Old World. Not a great deal is known about ''T. senegalensis.'' Taxonomy The African manatee was officially declared a species under the ''Trichechus senegalensis'' taxon in 1795 by naturalist Johann Heinrich Friedrich Link. No subspecies of this taxon are known. Although African manatees live in both coastal areas and isolated inland areas, genetic evidence suggests no significant differences between the two populations. The African manatee falls under the genus ''Trichechus'' with only two other species, the Amazonian manatee and the West Indian manatee, which are also sirenians. Range and habitat African manatees inhabit the widest ranges of habitats of any sirenian species, ranging from offshore islands in the Atlantic, rivers in t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
West Indian Manatee
The West Indian manatee (''Trichechus manatus''), also known as the North American manatee, is a large, aquatic mammal native to warm coastal areas of the Caribbean, from the eastern US to northern Brazil. Living alone or in herds, it feeds on underwater plants and uses its whiskers to navigate. It is divided into two endangered subspecies, the Florida manatee (''T. m. latirostris'') in the US and the Antillean manatee (''T. m. manatus'') in the Caribbean, both of which face pressure from habitat loss, pollution, and other human activity. The West Indian manatee is the largest of the sirenians (order Sirenia), a group of large aquatic mammals that includes the dugong, other manatees, and the extinct Steller's sea cow. Manatees are herbivores, have developed vocal communication abilities, and are covered in highly sensitive whiskers (called vibrissae) that are used for feeding and navigation. In breeding season, several males form mating herds around an individual female; on aver ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trichechus
Manatees (family Trichechidae, genus ''Trichechus'') are large, fully aquatic, mostly herbivorous marine mammals sometimes known as sea cows. There are three accepted living species of Trichechidae, representing three of the four living species in the order Sirenia: the Amazonian manatee (''Trichechus inunguis''), the West Indian manatee (''Trichechus manatus''), and the West African manatee (''Trichechus senegalensis''). They measure up to long, weigh as much as , and have paddle-like tails. Manatees are herbivores and eat over 60 different freshwater and saltwater plants. Manatees inhabit the shallow, marshy coastal areas and rivers of the Caribbean Sea, the Gulf of Mexico, the Amazon basin, and West Africa. The main causes of death for manatees are human-related issues, such as habitat destruction and human objects. Their slow-moving, curious nature has led to violent collisions with propeller-driven boats and ships. Some manatees have been found with over 50 scars on them ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Holocene
The Holocene ( ) is the current geological epoch. It began approximately 11,650 cal years Before Present (), after the Last Glacial Period, which concluded with the Holocene glacial retreat. The Holocene and the preceding Pleistocene together form the Quaternary period. The Holocene has been identified with the current warm period, known as MIS 1. It is considered by some to be an interglacial period within the Pleistocene Epoch, called the Flandrian interglacial.Oxford University Press – Why Geography Matters: More Than Ever (book) – "Holocene Humanity" section https://books.google.com/books?id=7P0_sWIcBNsC The Holocene corresponds with the rapid proliferation, growth and impacts of the human species worldwide, including all of its written history, technological revolutions, development of major civilizations, and overall significant transition towards urban living in the present. The human impact on modern-era Earth and its ecosystems may be considered of global si ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Miosiren
''Miosiren'' is an extinct genus of manatee from the Early Miocene of southeastern England (Suffolk) and Antwerp, Belgium. Two species are recognized, ''M. canhami'' and ''M. kocki''. Phylogeny A 2014 cladistic analysis of extinct sirenians recovered ''Miosiren'' as a close relative of ''Anomotherium'' in a separate subfamily within Trichechidae, Miosireninae.M. Voss. 2014. On the invalidity of Halitherium schinzii Kaup, 1838 (Mammalia, Sirenia), with comments on systematic consequences. Zoosystematics and Evolution 90(1):87-93 See also *Evolution of sirenians Sirenia is the order of placental mammals which comprises modern "sea cows" (manatees and the Dugong) and their extinct relatives. They are the only extant herbivorous marine mammals and the only group of herbivorous mammals to have become com ... References Neogene mammals of Europe Miocene sirenians Fossil taxa described in 1889 Prehistoric placental genera {{Paleo-sirenian-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
