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Paleopsephurus Wilsoni
''Paleopsephurus'' is an extinct genus of paddlefish (Polyodontidae). At present the genus contains the single species ''Paleopsephurus wilsoni''. The genus is known from the Late Cretaceous (Maastrichtian) aged Hell Creek Formation of Montana. History and classification The genus was described from three partial specimens currently residing in the collections of the University of Michigan Museum of Paleontology in Ann Arbor, Michigan, USA. Specimen number '' 22206 U.M.'' is a complete and well preserved skull with some denticles, pectoral girdle and pectoral fins. The second and third specimens were found in a block of matrix from the same location as ''2226 U.M.''. Specimen ''22207 U.M.'' is a portion of the caudal region of a paddlefish, while ''22208 U.M.'' is a partial shoulder with associated pectoral fin. While the specimens were found close to each other, it is impossible to determine if they represent a single individual, and as such were described as three separa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Archie Justus MacAlpin
Archie or Archy is a given name, almost exclusively masculine, and a diminutive of Archibald, which is derived from the Germanic ''ercan'', meaning “ genuine”, and ''bald'', meaning “ bold.” It has been in use as an independent given name in the Anglosphere since the 19th century. It has increased in use in English-speaking countries in the 21st century. The name has traditionally been well-used in the United Kingdom and has also been well-used in Australia and New Zealand. It was among the top 1,000 names for boys in the United States between 1880 and 1988, but had declined in use until 2018, when it was once again among the top 1,000 names for American boys. It has continued to increase in use following the 2019 birth of Prince Archie of Sussex, son of Prince Harry, Duke of Sussex and Meghan, Duchess of Sussex, who has brought attention to the name. It may refer to: People Given name or nickname *Archie Alexander (1888–1958), African-American mathematician, engineer, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Holotype
A holotype (Latin: ''holotypus'') is a single physical example (or illustration) of an organism used when the species (or lower-ranked taxon) was formally described. It is either the single such physical example (or illustration) or one of several examples, but explicitly designated as the holotype. Under the International Code of Zoological Nomenclature (ICZN), a holotype is one of several kinds of name-bearing types. In the International Code of Nomenclature for algae, fungi, and plants (ICN) and ICZN, the definitions of types are similar in intent but not identical in terminology or underlying concept. For example, the holotype for the butterfly '' Plebejus idas longinus'' is a preserved specimen of that subspecies, held by the Museum of Comparative Zoology at Harvard University. In botany and mycology, an isotype is a duplicate of the holotype, generally pieces from the same individual plant or samples from the same genetic individual. A holotype is not necessarily "ty ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Prehistoric Ray-finned Fish Genera
Prehistory, also called pre-literary history, is the period of human history between the first known use of stone tools by hominins 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 years ago. It took thousands of years for writing systems to be widely adopted, with writing having spread to almost all cultures by the 19th century. The end of prehistory therefore came at different times in different places, and the term is less often used in discussing societies where prehistory ended relatively recently. It is based on an old conception of history that without written records there could be no history. The most common conception today is that history is based on evidence, however the concept of prehistory hasn't been completely discarded. In the early Bronze Age, Sumer in Mesopotamia, the Indus Valley Civ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Monotypic Prehistoric Fish Genera
In biology, a monotypic taxon is a taxonomic group (taxon) that contains only one immediately subordinate taxon. A monotypic species is one that does not include subspecies or smaller, infraspecific taxa. In the case of genera, the term "unispecific" or "monospecific" is sometimes preferred. In botanical nomenclature, a monotypic genus is a genus in the special case where a genus and a single species are simultaneously described. Theoretical implications Monotypic taxa present several important theoretical challenges in biological classification. One key issue is known as "Gregg's Paradox": if a single species is the only member of multiple hierarchical levels (for example, being the only species in its genus, which is the only genus in its family), then each level needs a distinct definition to maintain logical structure. Otherwise, the different taxonomic ranks become effectively identical, which creates problems for organizing biological diversity in a hierarchical system. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
