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Metagonimus Yokogawai
''Metagonimus yokogawai'' is a species of a Trematoda, trematode, or fluke worm, in the family Heterophyidae. It is a human parasite causing metagonimiasis. It is among a few species of ''Metagonimus'' that cause metagonimiasis diseases (others being ''Metagonimus takahashii, M. takahashii'' and ''Metagonimus miyatai, M. miyatai''). Distribution This species occurs in Korea, China, Taiwan, Japan, Russia, Indonesia, Israel, and Spain. This species is found in areas with sweetfish, and that includes western and eastern riversides. It is basically found in places with water. Description ''Metagonimus yokogawai'' has adult flukes that parasitize the small intestine and causes inflammation. This species was discovered by Fujiro Katsurada with egg samples from Japan and Taiwan With this discovery, he was able to make a new genus of trematodes that this new parasite would fall under The size of these eggs are about 29 μm. Evidence also suggest that this parasite was present dur ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Animal
Animals are multicellular, eukaryotic organisms in the Kingdom (biology), biological kingdom Animalia. With few exceptions, animals Heterotroph, consume organic material, Cellular respiration#Aerobic respiration, breathe oxygen, are Motility, able to move, can Sexual reproduction, reproduce sexually, and go through an ontogenetic stage in which their body consists of a hollow sphere of Cell (biology), cells, the blastula, during Embryogenesis, embryonic development. Over 1.5 million Extant taxon, living animal species have been Species description, described—of which around 1 million are Insecta, insects—but it has been estimated there are over 7 million animal species in total. Animals range in length from to . They have Ecology, complex interactions with each other and their environments, forming intricate food webs. The scientific study of animals is known as zoology. Most living animal species are in Bilateria, a clade whose members have a Symmetry in biology#Bilate ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Semisulcospira Reiniana
''Semisulcospira reiniana'' is a species of freshwater snail with an operculum (gastropod), operculum, an aquatic gastropod mollusk in the family Semisulcospiridae. Taxonomy ''Semisulcospira reiniana'' belong to the ''Semisulcospira libertina'' species complex.Davis G. M. (1969). "A taxonomic study of some species of ''Semisulcospira'' in Japan (Mesogastropoda: Pleuroceridae)". ''Malacologia'' 7211294. Distribution This species occurs in List of non-marine molluscs of Japan, Japan. Parasites Parasites of ''Semisulcospira reiniana'' include: * Heterophyidae: ''Semisulcospira reiniana'' serves as the first intermediate host for ''Metagonimus yokogawai''.Shimazu T. & Kino H. (2015). "''Metagonimus yokogawai'' (Trematoda: Heterophyidae): From Discovery to Designation of a Neotype". ''The Korean Journal of Parasitology'' 53(5), 627–639. . References External links Semisulcospiridae {{Semisulcospiridae-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cercariae
Trematodes are parasitic flatworms of the class ''Trematoda'', specifically parasitic flukes with two suckers: one ventral and the other oral. Trematodes are covered by a tegument, that protects the organism from the environment by providing secretory and absorptive functions. The life cycle of a typical trematode begins with an egg. Some trematode eggs hatch directly in the environment (water), while others are eaten and hatched within a host, typically a mollusc. The hatchling is called a ''miracidium,'' a free-swimming, ciliated larva. Miracidia will then grow and develop within the intermediate host into a sac-like structure known as a sporocyst or into rediae, either of which may give rise to free-swimming, motile cercariae larvae. The cercariae then could either infect a vertebrate host or a second intermediate host. Adult metacercariae or mesocercariae, depending on the individual trematode's life cycle, will then infect the vertebrate host or be rejected and excreted thr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Redia (Trematoda)
Trematodes are parasitic flatworms of the class ''Trematoda'', specifically parasitic flukes with two suckers: one ventral and the other oral. Trematodes are covered by a tegument, that protects the organism from the environment by providing secretory and absorptive functions. The life cycle of a typical trematode begins with an egg. Some trematode eggs hatch directly in the environment (water), while others are eaten and hatched within a host, typically a mollusc. The hatchling is called a ''miracidium,'' a free-swimming, ciliated larva. Miracidia will then grow and develop within the intermediate host into a sac-like structure known as a sporocyst or into rediae, either of which may give rise to free-swimming, motile cercariae larvae. The cercariae then could either infect a vertebrate host or a second intermediate host. Adult metacercariae or mesocercariae, depending on the individual trematode's life cycle, will then infect the vertebrate host or be rejected and excreted thro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sporocyst (Trematoda)
Trematodes are parasitic flatworms of the class ''Trematoda'', specifically parasitic flukes with two suckers: one ventral and the other oral. Trematodes are covered by a tegument, that protects the organism from the environment by providing secretory and absorptive functions. The life cycle of a typical trematode begins with an egg. Some trematode eggs hatch directly in the environment (water), while others are eaten and hatched within a host, typically a mollusc. The hatchling is called a ''miracidium,'' a free-swimming, ciliated larva. Miracidia will then grow and develop within the intermediate host into a sac-like structure known as a sporocyst or into rediae, either of which may give rise to free-swimming, motile cercariae larvae. The cercariae then could either infect a vertebrate host or a second intermediate host. Adult metacercariae or mesocercariae, depending on the individual trematode's life cycle, will then infect the vertebrate host or be rejected and excreted thro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Freshwater Snail
Freshwater snails are gastropod mollusks which live in fresh water. There are many different families. They are found throughout the world in various habitats, ranging from ephemeral pools to the largest lakes, and from small seeps and springs to major rivers. The great majority of freshwater gastropods have a shell, with very few exceptions. Some groups of snails that live in freshwater respire using gills, whereas other groups need to reach the surface to breathe air. In addition, some are amphibious and have both gills and a lung (e.g. ''Ampullariidae''). Most feed on algae, but many are detritivores and some are filter feeders. According to a 2008 review of the taxonomy, there are about 4,000 species of freshwater gastropods (3,795–3,972). At least 33–38 independent lineages of gastropods have successfully colonized freshwater environments. It is not possible to quantify the exact number of these lineages yet, because they have yet to be clarified within the Cerit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Miracidium
The Miracidium is the second stage in the life cycle of trematodes. When trematode eggs are laid and come into contact with fresh water, they hatch and release miracidium. In this phase, miracidia are ciliated and free-swimming. This stage is completed upon coming in contact with, and entering into, a suitable intermediate host for the purposes of asexual reproduction. Many different species of ''Trematoda'' exist, expressing some variation in the physiology and appearance of the miracidia. The various trematode species implement similar strategies to increase their chances of locating and colonizing a new host. Anatomy ''Hirundinella ventricosa'' The trematode ''Hirundinella ventricosa'' releases eggs in strings. Each egg contains a single miracidium, while the string contains living spermatozoa. Miracidia have cilia that are only present in the upper portion of the body near an apical gland with 12 hook-like spines in the opening. ''Echinostoma paraensei'' Miracidia usu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Self-fertilization
Autogamy, or self-fertilization, refers to the fusion of two gametes that come from one individual. Autogamy is predominantly observed in the form of self-pollination, a reproductive mechanism employed by many flowering plants. However, species of protists have also been observed using autogamy as a means of reproduction. Flowering plants engage in autogamy regularly, while the protists that engage in autogamy only do so in stressful environments. Occurrence Protists ''Paramecium aurelia'' ''Paramecium aurelia'' is the most commonly studied protozoan for autogamy. Similar to other unicellular organisms, ''Paramecium aurelia'' typically reproduce asexually via binary fission or sexually via cross-fertilization. However, studies have shown that when put under nutritional stress, ''Paramecium aurelia'' will undergo meiosis and subsequent fusion of gametic-like nuclei. This process, defined as hemixis, a chromosomal rearrangement process, takes place in a number of steps. First, the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hermaphroditic
In reproductive biology, a hermaphrodite () is an organism that has both kinds of reproductive organs and can produce both gametes associated with male and female sexes. Many taxonomic groups of animals (mostly invertebrates) do not have separate sexes. In these groups, hermaphroditism is a normal condition, enabling a form of sexual reproduction in which either partner can act as the female or male. For example, the great majority of tunicates, pulmonate molluscs, opisthobranch, earthworms, and slugs are hermaphrodites. Hermaphroditism is also found in some fish species and to a lesser degree in other vertebrates. Most plants are also hermaphrodites. Animal species having different sexes, male and female, are called gonochoric, which is the opposite of hermaphrodite. There are also species where hermaphrodites exist alongside males (called androdioecy) or alongside females (called gynodioecy), or all three exist in the same species (called trioecy); these three systems are so ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Syrian Golden Hamster
The golden hamster or Syrian hamster (''Mesocricetus auratus'') is a rodent belonging to the hamster subfamily, Cricetinae. Their natural geographical range is in an arid region of northern Syria and southern Turkey. Their numbers have been declining in the wild due to a loss of habitat from agriculture and deliberate elimination by humans. Thus, wild golden hamsters are now considered endangered by the International Union for Conservation of Nature. However, captive breeding programs are well-established, and captive-bred golden hamsters are often kept as small house pets. Syrian hamsters are larger than many of the dwarf hamsters kept as pocket pets (up to five times larger), and weigh about the same as a sugar glider, though the wild European hamster exceeds Syrian hamsters in size. They are also used as scientific research animals throughout the world. Characteristics The size of adult animals is around long, with a lifespan of 2–3 years. Body mass is usually in th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lateolabrax Japonicus
The Japanese sea bass (''Lateolabrax japonicus'') is a species of catadromous marine ray-finned fish from the Asian sea bass family Lateolabracidae which is found in the Western Pacific. In Japan this species is known as . Description The Japanese sea bass has a slightly forked tail and a large mouth which has the lower jaw protruding beyond the upper jaw. The young fish have small black spots on the back and dorsal fin which tend to lost in larger fish. Its body has 12 to 15 spines in the first dorsal followed by 12 to 14 soft rays in its second dorsal. The anal fin has 3 spines and 7 to 9 soft rays. The maximum recorded total length is , although the more common standard length is and the maximum published weight is . Distribution The Japanese sea bass is found in the Western pacific where it occurs from Japan to the South China Sea. Habitat and biology The Japanese sea bass occurs on inshore rocky reefs where there is a current. The juveniles have been recorded ascendin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tribolodon Ezoe
''Tribolodon'' (Redfin dace) is a genus of cyprinid fishes found in marine and freshwater in Eastern Asia. Species There are currently 4 recognized species in this genus: * ''Tribolodon brandtii'' ( Dybowski, 1872) (Pacific redfin) * ''Tribolodon hakonensis'' ( Günther, 1877) (Big-scaled redfin, Japanese dace, Ugui) * ''Tribolodon nakamurai'' A. Doi & Shinzawa, 2000 * ''Tribolodon sachalinensis ''Tribolodon sachalinensis'' is a species of fish in the family Cyprinidae. It is endemic to Japan and Sakhalin Sakhalin ( rus, Сахали́н, r=Sakhalín, p=səxɐˈlʲin; ja, 樺太 ''Karafuto''; zh, c=, p=Kùyèdǎo, s=库页岛, t ...'' ( A. M. Nikolskii, 1889) References Cyprinidae genera Cyprinid fish of Asia {{Leuciscinae-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
