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Restrepophyllum
''Restrepophyllum'' is a genus of fossil foliage attributable to the Zamiaceae. This genus is found in Early Cretaceous rocks from Argentina. Taxonomy The genus was erected based on material from the Anfiteratro de Ticó Formation in Argentina based on a single specimen preserved with cuticle./ The name of the genus was chosen to highlight the similarity with '' Zamia restrepoi'' (D.W.Stev.) A.Lindstr., a species of ''Zamia ''Zamia'' is a genus of cycad of the family Zamiaceae, native to North America from the United States (in Georgia and Florida) throughout the West Indies, Central America, and South America as far south as Bolivia. The genus is considered to be ...'' previously segregated in the genus '' Chigua''. References Zamiaceae Prehistoric gymnosperm genera {{cretaceous-plant-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Zamiaceae
The Zamiaceae are a family of cycads that are superficially palm or fern-like. They are divided into two subfamilies with eight genera and about 150 species in the tropical and subtropical regions of Africa, Australia and North and South America. The Zamiaceae, sometimes known as zamiads, are perennial, evergreen, and dioecious. They have subterranean to tall and erect, usually unbranched, cylindrical stems, and stems clad with persistent leaf bases (in Australian genera). Their leaves are simply pinnate, spirally arranged, and interspersed with cataphylls. The leaflets are sometimes dichotomously divided. The leaflets occur with several sub-parallel, dichotomously branching longitudinal veins; they lack a mid rib. Stomata occur either on both surfaces or undersurface only. Their roots have small secondary roots. The coralloid roots develop at the base of the stem at or below the soil surface. Male and female sporophylls are spirally aggregated into determinate cones that gro ... [...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] |
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] |
Argentina
Argentina, officially the Argentine Republic, is a country in the southern half of South America. It covers an area of , making it the List of South American countries by area, second-largest country in South America after Brazil, the fourth-largest country in the Americas, and the List of countries and dependencies by area, eighth-largest country in the world. Argentina shares the bulk of the Southern Cone with Chile to the west, and is also bordered by Bolivia and Paraguay to the north, Brazil to the northeast, Uruguay and the South Atlantic Ocean to the east, and the Drake Passage to the south. Argentina is a Federation, federal state subdivided into twenty-three Provinces of Argentina, provinces, and one autonomous city, which is the federal capital and List of cities in Argentina by population, largest city of the nation, Buenos Aires. The provinces and the capital have their own constitutions, but exist under a Federalism, federal system. Argentina claims sovereignty ov ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Zamia Restrepoi
''Zamia restrepoi'' is a species of cycad in the family Zamiaceae. As of 2020, according to a preliminary field investigations the sole remaining known subpopulation is alarmingly small, comprising fewer than 100 adult specimens. There is a potential for the existence of additional subpopulations, but extensive field surveys have been unsuccessful in locating them, necessitating further research to comprehensively understand the species' population distribution and abundance. Classification history The Type for ''Zamia restrepoi'' was first collected in 1918 by Francis W. Pennell in northern Colombia. The type was not reported again until re-located by Rogrigo Bernal in 1986. Dennis Stevenson described the genus ''Chigua'' and two species, ''C. restrepoi'' and ''C. bernalii'', in 1990. It was recognized that ''Chigua'' was very closely related to ''Zamia'' and might indeed be nested in ''Zamia''. In 2009, Anders Lindström reclassified ''C. restrepoi'' as ''Z. restrepoi'' and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Zamia
''Zamia'' is a genus of cycad of the family Zamiaceae, native to North America from the United States (in Georgia and Florida) throughout the West Indies, Central America, and South America as far south as Bolivia. The genus is considered to be the most ecologically and morphologically diverse of the cycads, and is estimated to have originated about 68.3 million years ago. Description The genus comprises deciduous shrubs with aerial or subterranean circular stems, often superficially resembling palms. They produce spirally arranged, pinnate leaves which are pubescent, at least when young, having branched and simple, transparent and coloured hairs. The articulated leaflets lack a midrib, and are broad with subparallel dichotomous venation. Lower leaflets are not reduced to spines, though the petioles often have prickles. The emerging leaves of many ''Zamia'' species are striking, some emerging with a reddish or bronze cast ('' Z. roezlii'' being an example). '' Z. picta'' is e ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chigua (plant)
''Zamia restrepoi'' is a species of cycad in the family Zamiaceae. As of 2020, according to a preliminary field investigations the sole remaining known subpopulation is alarmingly small, comprising fewer than 100 adult specimens. There is a potential for the existence of additional subpopulations, but extensive field surveys have been unsuccessful in locating them, necessitating further research to comprehensively understand the species' population distribution and abundance. Classification history The Type for ''Zamia restrepoi'' was first collected in 1918 by Francis W. Pennell in northern Colombia. The type was not reported again until re-located by Rogrigo Bernal in 1986. Dennis Stevenson described the genus ''Chigua'' and two species, ''C. restrepoi'' and ''C. bernalii'', in 1990. It was recognized that ''Chigua'' was very closely related to ''Zamia'' and might indeed be nested in ''Zamia''. In 2009, Anders Lindström reclassified ''C. restrepoi'' as ''Z. restrepoi'' and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
