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Amazon Molly
The Amazon molly (''Poecilia formosa'') is a freshwater fish native to the warm waters of northeastern Mexico and the southern parts of the U.S. state of Texas. It reproduces through gynogenesis, and essentially all individuals are females. The common name of "Amazon molly," acknowledges this trait as a reference to the Amazon warriors, a female-run society in Greek mythology. The Amazon molly is a hybrid species, and its parent species are the sailfin molly (''Poecilia latipinna'') and the Atlantic molly (''Poecilia mexicana''). In 1932, this species was the first vertebrate confirmed to be capable of asexual reproduction. ''Poecilia formosa'' gets its name from the Greek ''poikilos'' meaning "variegated" or "speckled," and the Latin ''formosa'' meaning "beautiful." Species description The Amazon molly shares many of the same general characteristics of its parent species. Some of these characteristics include a rounded caudal fin, a small anal fin, small pelvic fins, pectoral fi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Charles Frédéric Girard
Charles Frédéric Girard (; 8 March 1822 – 29 January 1895) was a French biologist specializing in ichthyology and herpetology. Biography Girard was born on 8 March 1822 in Mulhouse, France. He studied at the College of Neuchâtel, Switzerland, as a student of Louis Agassiz. In 1847, he accompanied Agassiz as his assistant to Harvard University. Three years later, Spencer Fullerton Baird called him to the Smithsonian Institution to work on its growing collection of North American reptiles, amphibians and fishes. He worked at the museum for the next ten years and published numerous papers, many in collaboration with Baird. In 1854, he was naturalized as a U.S. citizen. Besides his work at the Smithsonian, he managed to earn an M.D. from Georgetown University in Washington, D.C. in 1856. In 1859 he returned to France and was awarded the Cuvier Prize by the Institute of France for his work on the North American reptiles and fishes two years later. When the American Civil Wa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Veracruz
Veracruz, formally Veracruz de Ignacio de la Llave, officially the Free and Sovereign State of Veracruz de Ignacio de la Llave, is one of the 31 states which, along with Mexico City, comprise the 32 Political divisions of Mexico, Federal Entities of Mexico. Located in eastern Mexico, Veracruz is bordered by seven states, which are Tamaulipas, San Luis Potosí, Hidalgo (state), Hidalgo, Puebla, Oaxaca, Chiapas, and Tabasco. Veracruz is divided into Municipalities of Veracruz, 212 municipalities, and its capital city is Xalapa, Xalapa-Enríquez. Veracruz has a significant share of the coastline of the Gulf of Mexico on the east of the state. The state is noted for its mixed ethnic and indigenous populations. Cuisine of Veracruz, Its cuisine reflects the many cultural influences that have come through the state because of the importance of the port of Veracruz (city), Veracruz. In addition to the capital city, the state's largest cities include Veracruz, Coatzacoalcos, Córdoba, V ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Triploid
Polyploidy is a condition in which the cells of an organism have more than two paired sets of ( homologous) chromosomes. Most species whose cells have nuclei (eukaryotes) are diploid, meaning they have two complete sets of chromosomes, one from each of two parents; each set contains the same number of chromosomes, and the chromosomes are joined in pairs of homologous chromosomes. However, some organisms are polyploid. Polyploidy is especially common in plants. Most eukaryotes have diploid somatic cells, but produce haploid gametes (eggs and sperm) by meiosis. A monoploid has only one set of chromosomes, and the term is usually only applied to cells or organisms that are normally diploid. Males of bees and other Hymenoptera, for example, are monoploid. Unlike animals, plants and multicellular algae have life cycles with two alternating multicellular generations. The gametophyte generation is haploid, and produces gametes by mitosis; the sporophyte generation is diploid and p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
FishBase
FishBase is a global species database of fish species (specifically finfish). It is the largest and most extensively accessed online database on adult finfish on the web.Marine Fellow: Rainer Froese ''Pew Environment Group''. Over time it has "evolved into a dynamic and versatile ecological tool" that is widely cited in scholarly publications. FishBase provides comprehensive species data, including information on , geographical distribution, biometrics and morpholo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Poecilia Sphenops
''Poecilia sphenops'', called the Mexican molly or simply the molly, is a species of poeciliid fish from Central America. It was once understood as a widespread species with numerous local variants ranging from Mexico to Venezuela, but these variants are today considered distinct species belonging to the ''P. sphenops'' complex and ''P. sphenops'' itself as being native to Mexico, Guatemala, and Honduras. Due in part to its popularity as an aquarium fish, the species has been introduced outside of its native range, but many records may in fact refer to '' P. mexicana'' or other species from the complex. ''P. sphenops'' has been crossbred with other mollies, notably '' P. latipinna'' and '' P. velifera'', to produce fancy mollies for the ornamental fish trade. Taxonomy ''P. sphenops'' is placed in the subgenus ''Mollienesia'' (mollies) according to the prevailing taxonomic classification of species within the genus ''Poecilia'', and more precisely within the shortfin molly clade, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Poecilia Latipunctata
The broadspotted molly (''Poecilia latipunctata''), locally known as ''molly del Tamesi'', is a critically endangered species of fish in the family Poeciliidae, endemic to a small part of the Tamesí River system (itself part of the Pánuco River basin) in 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 boundar .... References External links * latipunctata Taxa named by Seth Eugene Meek Fish described in 1904 Endemic fish of Mexico Freshwater fish of Mexico Taxonomy articles created by Polbot {{Poeciliidae-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Poecilia Mexicana
''Poecilia mexicana'', commonly known as the shortfin molly or Atlantic molly, is a species of poeciliid fish native to fresh and brackish water in Mexico and Guatemala. One population is found in caves and known as the cave molly. Description The maximum standard length of this fish is . It typically grows to a total length . Distribution and habitat The fish lives in tropical freshwater and brackish water habitats. The shortfin molly is considered benthopelagic. It lives in a pH range between 7.0 and 7.5 at temperatures between 22 and 28 degrees Celsius. The species does not migrate. It is an invasive species in the Muddy River of Nevada, USA. Ecology Speciation In two case studies in Cueva del Azufre and Cueva Luna Azufre in Tabasco, Mexico, the Atlantic molly is experiencing speciation. It is occurring between cave and surface populations as well as between habitats of varying sulfur concentrations. Human significance The fishing industry has no interest in harvesting t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sailfin Molly
The sailfin molly (''Poecilia latipinna'') is a livebearer fish typically found in both freshwater and brackish waterways along the East Coast of the United States, from North Carolina south to Florida, and around the Gulf of Mexico The Gulf of Mexico () is an oceanic basin and a marginal sea of the Atlantic Ocean, mostly surrounded by the North American continent. It is bounded on the northeast, north, and northwest by the Gulf Coast of the United States; on the southw ... to Texas, and south to the Yucatán Peninsula of Mexico. Given their preference for more brackish water conditions, mollies are often found within just a few yards or miles of the ocean, inhabiting coastal estuaries, lagoons, river deltas and swamps, as well as Tide, tidal areas (such as mangrove swamps) with a regular inflow of oceanic minerals and nutrients mixing with inland freshwater sources. Taxonomy The sailfin molly was originally described in 1821 as ''Mollienesia latipinna'' by the naturalist ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gynogenesis Diagran
Gynogenesis, a form of parthenogenesis, is a system of asexual reproduction that requires the presence of sperm without the actual contribution of its DNA for completion. The paternal DNA dissolves or is destroyed before it can fuse with the egg. The egg cell of the organism is able to develop, unfertilized, into an adult using only maternal genetic material. Gynogenesis is often termed "sperm parasitism" in reference to the somewhat pointless role of male gametes. Gynogenetic species, "gynogens" for short, are unisexual, meaning they must mate with males from a closely related bisexual species that normally reproduces sexually. Gynogenesis is a disadvantageous mating system for males, as they are unable to pass on their DNA. The question as to why this reproductive mode exists, given that it appears to combine the disadvantages of both asexual and sexual reproduction, remains unsolved in the field of evolutionary biology. The male equivalent to this process is androgenesis where th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Blue-spotted Salamander
The blue-spotted salamander (''Ambystoma laterale'') is a mole salamander native to the Great Lakes states and northeastern United States, and parts of Ontario and Quebec in Canada. Their range is known to extend to James Bay to the north, and southeastern Manitoba to the west. Description Blue-spotted salamanders are between in length, of which the tail comprises 40%. Generally, males are slightly smaller than their female counterparts (Donato 2000). Their skin is bluish-black, with characteristic blue and white flecks on its back, and bluish-white spots on the sides of its body and tail. They have elongated bodies. The vent is typically black, which contrasts with the paler belly. Larvae that have transformed may have yellow splotches; these turn blue once the individual becomes terrestrial. Occasionally, a melanistic individual may be found in the wild. They have long toes: four on the front feet and five on the hind feet. Typically, specimens will have 12–14 costal groov ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Desert Grassland Whiptail Lizard
The desert grassland whiptail lizard (''Aspidoscelis uniparens'') is an all-female species of reptiles in North America. It was formerly placed in the genus ''Cnemidophorus''. A common predator of the whiptail lizard is the leopard lizard that preys on ''A. uniparens'' by using ambush and stalk hunting tactics. These reptiles reproduce by parthenogenesis. In this process, eggs undergo a chromosome doubling after meiosis, developing into lizards without being fertilized. However, ovulation is enhanced by female-female courtship and mating (pseudo-copulation) rituals that resemble the behavior of closely related species that reproduce sexually. Description The desert grassland whiptail lizard is a relatively small reptile, whose size ranges from . Desert grassland whiptails are very long and slim, with a thin tail that is longer than their body length. Their distinct identifying feature are the six yellowish lines that run the length of their body. The majority of the whiptail's b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
New Mexico Whiptail
The New Mexico whiptail (''Aspidoscelis neomexicanus'') is a female-only species of lizard found in New Mexico and Arizona in the southwestern United States, and in Chihuahua in northern Mexico. It is the official state reptile of New Mexico. It is one of many lizard species known to be parthenogenetic. Individuals of the species can be created either through the hybridization of the little striped whiptail ('' A. inornatus'') and the western whiptail ('' A. tigris''), or through the parthenogenetic reproduction of an adult New Mexico whiptail. The hybridization of these species prevents healthy males from forming, whereas males exist in one parent species (see sexual differentiation). Parthenogenesis allows the all-female population to reproduce. This combination of interspecific hybridization and parthenogenesis exists as a reproductive strategy in several species of whiptail lizard within the genus '' Aspidoscelis'' to which the New Mexico whiptail belongs. Description Th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
