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Xeneichthys
''Xeneichthys'' is an extinct genus of teleost fish from the Albian El Doctor Formation in Hidalgo, Mexico. The type and only species is ''X. yanesi'' is known from multiple specimens, representing the entire body. Description ''Xeneichthys'' is known from several specimens from the Muhi Quarry. The holotype, UAHMP 1063, represents a complete specimen. The average length of the species is 17cm, however some sampled individuals reached up to 20cm Etymology The generic name, ''Xeneichthys''. 'Xene' comes from the Otomí word meaning 'big mouth', while 'ichthys', originates from the Ancient Greek Ancient Greek (, ; ) includes the forms of the Greek language used in ancient Greece and the classical antiquity, ancient world from around 1500 BC to 300 BC. It is often roughly divided into the following periods: Mycenaean Greek (), Greek ... word meaning 'fish'. The specific epithet, ''yanesi'', honors the Yáñez family, who work at the quarry the specimens were fou ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
2024 In Paleoichthyology
This list of fossil fish research presented in 2024 is a list of new fossil taxa of Agnatha, jawless vertebrates, placoderms, Chondrichthyes, cartilaginous fishes, Osteichthyes, bony fishes, and other fishes that were binomial nomenclature, described during the year, as well as other significant discoveries and events related to paleoichthyology that occurred in 2024. Jawless vertebrates Jawless vertebrate research * A study on the evolutionary history of hagfishes, as indicated by the fossil record and molecular data, is published by Brownstein & Near (2024), who consider the hagfish crown group to be a lineage with Early Permian origin and a long history in continental slope settings. * Brookfield (2024) interprets ''Jamoytius, Jamoytius kerwoodi'' as a probable detritivore or herbivore feeding on ''Dictyocaris'' (interpreted by the author as possible algal Thallus, thalli). * Evidence interpreted as indicating that oral plates of pteraspid heterostracans had a mechanical f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
El Doctor Formation
The El Doctor Formation is a geologic formation in Mexico. It preserves fossils dating back to the Albian and Cenomanian stages of the Cretaceous period.El Doctor Formation at .org fossils show that age of Late Albian is more likely. Description The light grey micritic limestone sequence with intercalated black chert lenses was deposited in an open marine basin with a hypersaline and/or poorly oxygenated bottom.Fossil content The formation has provided the following fossils:[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Early Cretaceous
The Early Cretaceous (geochronology, geochronological name) or the Lower Cretaceous (chronostratigraphy, chronostratigraphic name) is the earlier or lower of the two major divisions of the Cretaceous. It is usually considered to stretch from 143.1 Megaannum#SI prefix multipliers, Ma to 100.5 Ma. Geology Proposals for the exact age of the Barremian–Aptian boundary ranged from 126 to 117 Ma until recently (as of 2019), but based on drillholes in Svalbard the defining Anoxic event#Cretaceous, early Aptian Oceanic Anoxic Event 1a (OAE1a) was dated to 123.1±0.3 Ma, limiting the possible range for the boundary to c. 122–121 Ma. There is a possible link between this anoxic event and a series of Early Cretaceous large igneous provinces (LIP). The Ontong Java Plateau, Ontong Java-Manihiki Plateau, Manihiki-Hikurangi Plateau, Hikurangi large igneous province, emplaced in the South Pacific at c. 120 Ma, is by far the largest LIP in Earth's history. The Onto ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Monotypic Taxon
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 Genus, 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 o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Euteleostei
Euteleostei, whose members are known as euteleosts, is a clade of bony fishes within Teleostei that evolved some 240 million years ago, although the oldest known fossil remains are only from the Early Cretaceous. It is divided into Protacanthopterygii (including the salmon and Stomiidae, dragonfish) and Neoteleostei (including the lanternfish, lizardfish, oarfish, and Acanthopterygii). Taxonomy The following taxa are known: * Clade Pan-Euteleostei ** Genus †''Avitosmerus'' ** Genus †''Barcarenichthys'' ** Genus †''Beurlenichthys'' ** Genus †''Casieroides'' ** Genus †''Chardonius'' ** Genus †''Erihalcis'' ** Genus †''Gaudryella'' ** Genus †''Gharbouria'' ** Genus †''Helgolandichthys'' ** Genus †''Parawenzichthys'' ** Genus †''Santanasalmo'' ** Genus †''Scombroclupeoides'' ** Genus †''Tchernovichthys'' ** Genus †''Wenzichthys'' ** Cohort Euteleostei *** Superorder Lepidogalaxias, Lepidogalaxii *** Superorder Protacanthopterygii *** Clade Stomiati *** ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ancient Greek
Ancient Greek (, ; ) includes the forms of the Greek language used in ancient Greece and the classical antiquity, ancient world from around 1500 BC to 300 BC. It is often roughly divided into the following periods: Mycenaean Greek (), Greek Dark Ages, Dark Ages (), the Archaic Greece, Archaic or Homeric Greek, Homeric period (), and the Classical Greece, Classical period (). Ancient Greek was the language of Homer and of fifth-century Athens, fifth-century Athenian historians, playwrights, and Ancient Greek philosophy, philosophers. It has contributed many words to English vocabulary and has been a standard subject of study in educational institutions of the Western world since the Renaissance. This article primarily contains information about the Homeric Greek, Epic and Classical periods of the language, which are the best-attested periods and considered most typical of Ancient Greek. From the Hellenistic period (), Ancient Greek was followed by Koine Greek, which is regar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Otomi Language
Otomi ( ; ) is an Oto-Pamean languages, Oto-Pamean language spoken by approximately 240,000 indigenous Otomi people in the Mexican Plateau, central ''altiplano'' region of Mexico. Otomi consists of several closely related languages, many of which are not mutually intelligible. The word ''Hñähñu'' has been proposed as an endonym, but since it represents the usage of a single dialect, it has not gained wide currency. Linguists have classified the modern dialects into three dialect areas: the Northwestern dialects are spoken in Querétaro, Hidalgo (state), Hidalgo and Guanajuato; the Southwestern dialects are spoken in the Mexico (state), State of Mexico; and the Eastern dialects are spoken in the highlands of Veracruz, Puebla, and eastern Hidalgo and villages in Tlaxcala and Mexico states. Like all other Oto-Manguean languages, Otomi is a tonal language, and most varieties distinguish three tones. Nouns are marked only for possessor; the plural number is marked with a definite ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Universidad Autónoma Del Estado De Hidalgo
The Autonomous University of the State of Hidalgo (''Universidad Autónoma del Estado de Hidalgo'' or UAEH) is a public university located in Pachuca, the capital of the Hidalgo (state), State of Hidalgo in east-central Mexico, with campuses statewide. The university was initially founded in 1869. It is the oldest, largest, and most respected research university in the state and a member of the Consortium of Mexican Universities (CUMEX). History The UAEH was the first university established in the state of Hidalgo, tracing its origins to the ''Instituto Literario y Escuela de Artes y Oficios'' (Literary Institute and School of Arts and Crafts), founded in Pachuca in February 1869 by various businessmen and promptly absorbed by the state government under Governor Juan C. Doria. In 1875, the new school moved from a rented house to the former San Juan de Dios Hospital, which had been founded in 1725; this structure is now the Central Building of the university. During the Mexican R ... [...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] |
Mexico
Mexico, officially the United Mexican States, is a country in North America. It is the northernmost country in Latin America, and borders the United States to the north, and Guatemala and Belize to the southeast; while having maritime boundary, maritime boundaries with the Pacific Ocean to the west, the Caribbean Sea to the southeast, and the Gulf of Mexico to the east. Mexico covers 1,972,550 km2 (761,610 sq mi), and is the List of countries by area, thirteenth-largest country in the world by land area. With a population exceeding 130 million, Mexico is the List of countries by population, tenth-most populous country in the world and is home to the Hispanophone#Countries, largest number of native Spanish speakers. Mexico City is the capital and List of cities in Mexico, largest city, which ranks among the List of cities by population, most populous metropolitan areas in the world. Human presence in Mexico dates back to at least 8,000 BC. Mesoamerica, considered a cradle ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Type Species
In International_Code_of_Zoological_Nomenclature, zoological nomenclature, a type species (''species typica'') is the species name with which the name of a genus or subgenus is considered to be permanently taxonomically associated, i.e., the species that contains the biological Type (biology), type wiktionary:en:specimen, specimen (or specimens). Article 67.1 A similar concept is used for suprageneric groups and called a type genus. In botanical nomenclature, these terms have no formal standing under the International Code of Nomenclature for algae, fungi, and plants, code of nomenclature, but are sometimes borrowed from zoological nomenclature. In botany, the type of a genus name is a specimen (or, rarely, an illustration) which is also the type of a species name. The species name with that type can also be referred to as the type of the genus name. Names of genus and family ranks, the various subdivisions of those ranks, and some higher-rank names based on genus names, have suc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hidalgo (state)
Hidalgo, officially the Free and Sovereign State of Hidalgo, is one of the 31 states which, along with Mexico City, constitute the 32 Political divisions of Mexico, federal entities of Mexico. It is divided into Municipalities of Hidalgo, 84 municipalities and its capital city is Pachuca, Pachuca de Soto. It is located in east-central Mexico and is bordered by San Luis Potosí and Veracruz on the north, Puebla on the east, Tlaxcala and State of Mexico on the south and Querétaro on the west. In 1869, Benito Juárez created the State of Hidalgo and made Pachuca its capital city; ''"de Soto"'' was added later in recognition of , who is considered the most important driving force in creating the state. The state was named after Miguel Hidalgo y Costilla, the initiator of the Mexican War of Independence. The indigenous peoples of the state, such as the Otomi people, Otomi, retain much of their Pre-Columbian Mexico, traditional culture. In addition to Spaniards in Mexico, Mexicans o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
