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Ribeiroia
''Ribeiroia'' () is a genus of trematode parasites that sequentially infect freshwater snails in the family Planorbidae (ramshorn snails) as first intermediate hosts, fish and larval amphibians as second intermediate hosts, and birds and mammals as definitive hosts (see ). In North America, infection by ''Ribeiroia'' has been linked to amphibians with limb malformations. The connection between parasitic infection and limb malformations has generated questions about (a) whether parasite-induced malformations in amphibians are increasing (see ), and (b) the consequences of such abnormalities for amphibian population conservation (see ). Taxonomy ''Ribeiroia'' is a genus of parasites in the class Trematoda, phylum Platyhelminthes. Currently three species and one subspecies of ''Ribeiroia'' are recognized: '' R. ondatrae'' in North America, ''R. marini'' in the Caribbean, ''R. m. guadeloupensis'' on the Caribbean island of Guadeloupe, and ''R. congolensis'' in Africa (Johnson et a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ribeiroia Congolensis
''Ribeiroia'' () is a genus of trematode parasites that sequentially infect freshwater snails in the family Planorbidae (ramshorn snails) as first intermediate Host (biology), hosts, fish and larval amphibians as second intermediate hosts, and birds and mammals as definitive hosts (see ). In North America, infection by ''Ribeiroia'' has been linked to amphibians with limb Birth defect, malformations. The connection between Parasitic disease, parasitic infection and limb malformations has generated questions about (a) whether parasite-induced malformations in amphibians are increasing (see ), and (b) the consequences of such abnormalities for amphibian population conservation (see ). Taxonomy ''Ribeiroia'' is a genus of parasites in the class Trematoda, phylum Flatworm, Platyhelminthes. Currently three species and one subspecies of ''Ribeiroia'' are recognized: ''Ribeiroia ondatrae, R. ondatrae'' in North America, ''R. marini'' in the Caribbean, ''R. m. guadeloupensis'' on the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ribeiroia Marini
''Ribeiroia'' () is a genus of trematode parasites that sequentially infect freshwater snails in the family Planorbidae (ramshorn snails) as first intermediate hosts, fish and larval amphibians as second intermediate hosts, and birds and mammals as definitive hosts (see ). In North America, infection by ''Ribeiroia'' has been linked to amphibians with limb malformations. The connection between parasitic infection and limb malformations has generated questions about (a) whether parasite-induced malformations in amphibians are increasing (see ), and (b) the consequences of such abnormalities for amphibian population conservation (see ). Taxonomy ''Ribeiroia'' is a genus of parasites in the class Trematoda, phylum Platyhelminthes. Currently three species and one subspecies of ''Ribeiroia'' are recognized: '' R. ondatrae'' in North America, ''R. marini'' in the Caribbean, ''R. m. guadeloupensis'' on the Caribbean island of Guadeloupe, and ''R. congolensis'' in Africa (Johnson et a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ribeiroia Ondatrae
''Ribeiroia ondatrae'', or the frog-mutating flatworm is a parasite in the genus '' Ribeiroia'' which is believed to be responsible for many of the recent increases in amphibian limb malformations, particularly missing, malformed, and additional hind legs. It was first reported from livers of '' Ondatra'', hence its specific name. In recent studies, it was found that in areas infected with ''R. ondatrae'', the population of amphibian limb malformations was much higher than populations in which this trematode was not present. Each species studied showed varying results. For example, amphibians of species '' Pseudacris regilla'', '' Rana aurora'' and '' Taricha torosa'' were found to physically display a higher frequency in the number of abnormalities. The exact mechanism of deformation has not been determined but it has been theorized that deformation results from mechanical disruption of the cells involved in limb bud formation during the amphibian larval stage. Life cycle '' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cladocystis Trifolium
Opisthorchiidae is a family of digenean trematodes. Opisthorchiidae have cosmopolitan distribution. The most medically important species in the family Opisthorchiidae are ''Clonorchis sinensis'', ''Opisthorchis viverrini'', and '' Opisthorchis felineus'', that are causes of the disease clonorchiasis. Some species are parasites of economically important fish, e.g. ''Clarias gariepinus''.Jansen van Rensburg, C., van As, J.G. & King, P.H. 2013. New records of digenean parasites of ''Clarias gariepinus'' (Pisces: Clariidae) from the Okavango Delta, Botswana, with description of ''Thaparotrema botswanensis'' sp. n. (Plathelminthes: Trematoda). ''African Invertebrates ''African Invertebrates'' is a peer-reviewed open access scientific journal that covers the taxonomy, systematics, biogeography, ecology, conservation, and palaeontology of Afrotropical invertebrates, whether terrestrial, freshwater, or marine. A ...'' 54 (2): 431–446. Subfamilies Thirteen subfamilies are in the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Subspecies
In Taxonomy (biology), biological classification, subspecies (: subspecies) is a rank below species, used for populations that live in different areas and vary in size, shape, or other physical characteristics (Morphology (biology), morphology), but that can successfully interbreed. Not all species have subspecies, but for those that do there must be at least two. Subspecies is abbreviated as subsp. or ssp. and the singular and plural forms are the same ("the subspecies is" or "the subspecies are"). In zoology, under the International Code of Zoological Nomenclature, the subspecies is the only taxonomic rank below that of species that can receive a name. In botany and mycology, under the International Code of Nomenclature for algae, fungi, and plants, other infraspecific name, infraspecific ranks, such as variety (botany), variety, may be named. In bacteriology and virology, under standard International Code of Nomenclature of Prokaryotes, bacterial nomenclature and virus clas ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Guadeloupe
Guadeloupe is an Overseas departments and regions of France, overseas department and region of France in the Caribbean. It consists of six inhabited islands—Basse-Terre Island, Basse-Terre, Grande-Terre, Guadeloupe, Grande-Terre, Marie-Galante, La Désirade, and two Îles des Saintes—as well as many uninhabited islands and outcroppings. It is south of Antigua and Barbuda and Montserrat and north of Dominica. The capital city is Basse-Terre, on the southern west coast of Basse-Terre Island; the most populous city is Les Abymes and the main centre of business is neighbouring Pointe-à-Pitre, both on Grande-Terre Island. It had a population of 395,726 in 2024. Like the other overseas departments, it is an integral part of France. As a constituent territory of the European Union and the eurozone, the euro is its official currency and any European Union citizen is free to settle and work there indefinitely, but is not part of the Schengen Area. It included Saint Barthélemy and C ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sequencing
In genetics and biochemistry, sequencing means to determine the primary structure (sometimes incorrectly called the primary sequence) of an unbranched biopolymer. Sequencing results in a symbolic linear depiction known as a sequence which succinctly summarizes much of the atomic-level structure of the sequenced molecule. DNA sequencing DNA sequencing is the process of determining the nucleotide order of a given DNA fragment. So far, most DNA sequencing has been performed using the chain termination method developed by Frederick Sanger. This technique uses sequence-specific termination of a DNA synthesis reaction using modified nucleotide substrates. However, new sequencing technologies such as pyrosequencing are gaining an increasing share of the sequencing market. More genome data are now being produced by pyrosequencing than Sanger DNA sequencing. Pyrosequencing has enabled rapid genome sequencing. Bacterial genomes can be sequenced in a single run with several times cov ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Morphology (biology)
Morphology (from Ancient Greek μορφή (morphḗ) "form", and λόγος (lógos) "word, study, research") is the study of the form and structure of organisms and their specific structural features. This includes aspects of the outward appearance (shape, structure, color, pattern, size), as well as the form and structure of internal parts like bones and organs, i.e., anatomy. This is in contrast to physiology, which deals primarily with function. Morphology is a branch of life science dealing with the study of the overall structure of an organism or taxon and its component parts. History The etymology of the word "morphology" is from the Ancient Greek (), meaning "form", and (), meaning "word, study, research". While the concept of form in biology, opposed to function, dates back to Aristotle (see Aristotle's biology), the field of morphology was developed by Johann Wolfgang von Goethe (1790) and independently by the German anatomist and physiologist Karl Fried ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Esophagus
The esophagus (American English), oesophagus (British English), or œsophagus (Œ, archaic spelling) (American and British English spelling differences#ae and oe, see spelling difference) all ; : ((o)e)(œ)sophagi or ((o)e)(œ)sophaguses), colloquially known also as the food pipe, food tube, or gullet, is an Organ (anatomy), organ in vertebrates through which food passes, aided by Peristalsis, peristaltic contractions, from the Human pharynx, pharynx to the stomach. The esophagus is a :wiktionary:fibromuscular, fibromuscular tube, about long in adults, that travels behind the trachea and human heart, heart, passes through the Thoracic diaphragm, diaphragm, and empties into the uppermost region of the stomach. During swallowing, the epiglottis tilts backwards to prevent food from going down the larynx and lungs. The word ''esophagus'' is from Ancient Greek οἰσοφάγος (oisophágos), from οἴσω (oísō), future form of φέρω (phérō, "I carry") + ἔφαγον ( ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lauro Travassos
Lauro Pereira Travassos (2 July 1890 – 20 November 1970) was a Brazilian parasitologist. He collected helminth specimens from across South America and studied their life-histories. He built a Brazilian school of parasitology through his students. His son Lauro Pereira Travassos Filho (1918–1989) became an entomologist while another son Haroldo Pereira Travassos, Haroldo Pereira became an ichthyologist. Travassos was born in Angra dos Reis. He studied medicine at Rio de Janeiro and his first work was on ''Linguatula serrata'' in the intestine of a patient. His doctoral thesis was on species of Heterakidae, Heterakinae. He then worked at the Oswaldo Cruz Foundation, Instituto Oswaldo Cruz which was then called the Manguinhos under José Gomes de Faria. He became chair of parasitology at the faculty of medicine in São Paulo in 1926. In 1929 he went to the tropical institute of Hamburg to work with the helminthologist Friedrich Fülleborn (1866–1933). He became a full professor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Flatworm
Platyhelminthes (from the Greek language, Greek πλατύ, ''platy'', meaning "flat" and ἕλμινς (root: ἑλμινθ-), ''helminth-'', meaning "worm") is a Phylum (biology), phylum of relatively simple bilaterian, Segmentation (biology), unsegmented, soft-bodied invertebrates commonly called flatworms or flat worms. Being acoelomates (having no coelom, body cavity), and having no specialised circulatory system, circulatory and respiratory system, respiratory organ (anatomy), organs, they are restricted to having flattened shapes that allow oxygen and nutrients to pass through their bodies by diffusion. The digestive cavity has only one opening for both ingestion (intake of nutrients) and egestion (removal of undigested wastes); as a result, the food can not be processed continuously. In traditional medicinal texts, Platyhelminthes are divided into Turbellaria, which are mostly non-parasitic animals such as planarians, and three entirely parasitic groups: Cestoda, Trematod ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
