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Hydrichthys Mirus
''Hydrichthys'' is a genus of colonial marine hydrozoans formerly placed in the family Hydrichthyidae but is now included in the family Pandeidae. The polyps of members of this genus are parasitic. The polyp attaches itself to a fish, and in one species exhibits hyperparasitism by attaching itself to a copepod, itself the parasite of a fish. Parasitism The life history of hydrozoans typically has a larval, polyp stage and a bell-shaped medusa stage. In ''Hydrichthys'', the polyp has no tentacles but develops a root-like stolon which it thrusts through the skin of its host, usually a fish, to suck the blood and body fluids. During the medusa stage, ''Hydrichthys'' lives independently in the ocean. In one species, ''Hydrichthys sarcotretis'', parasitism is taken a stage further when the hydrozoan attaches itself to the copepod ''Cardiodectes medusaeus''. This is itself an ectoparasite of lanternfish in the family Myctophidae. The copepod attaches itself to the bulbus arteriosus o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hydrichthys Sarcotretis
''Hydrichthys sarcotretis'' is a species of colonial marine hydrozoans now included in the family Pandeidae. The polyps of members of this genus are parasitic and attach themselves to a fish. ''H. sarcotretis'' is a species that exhibits hyperparasitism by attaching itself to a copepod, itself the parasite of a fish. In ''H. sarcotretis'', parasitism is taken a stage further when the hydrozoan attaches itself to the copepod ''Cardiodectes medusaeus''. This is itself an ectoparasite of the Northern lampfish (''Stenobrachius leucopsarus'') in the family Myctophidae. The copepod attaches itself to the bulbus arteriosus of the fish. Such a parasitic chain is known as hyperparasitism A hyperparasite, also known as a metaparasite, is a parasite whose host, often an insect, is also a parasite, often specifically a parasitoid. Hyperparasites are found mainly among the wasp-waisted Apocrita within the Hymenoptera, and in two othe .... The actions of the copepod castrate its fish host. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lanternfish
Lanternfishes (or myctophids, from the Greek μυκτήρ ''myktḗr'', "nose" and ''ophis'', "serpent") are small mesopelagic fish of the large family Myctophidae. One of two families in the order Myctophiformes, the Myctophidae are represented by 246 species in 33 genera, and are found in oceans worldwide. Lanternfishes are aptly named after their conspicuous use of bioluminescence. Their sister family, the Neoscopelidae, are much fewer in number but superficially very similar; at least one neoscopelid shares the common name "lanternfish": the large-scaled lantern fish, '' Neoscopelus macrolepidotus''. Lanternfish are among the most widely distributed, diverse and populous vertebrates, with some estimates suggesting that they may have a total global biomass of 1.8 to 16 gigatonnes, accounting for up to 65% of all deep-sea fish biomass. Commercial fisheries for them exist off South Africa, in the sub-Antarctic, and in the Gulf of Oman. Description Lanternfish typically ha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hydrichthys Pietschi
''Hydrichthys'' is a genus of colonial marine hydrozoans formerly placed in the family Hydrichthyidae but is now included in the family Pandeidae. The polyps of members of this genus are parasitic. The polyp attaches itself to a fish, and in one species exhibits hyperparasitism by attaching itself to a copepod, itself the parasite of a fish. Parasitism The life history of hydrozoans typically has a larval, polyp stage and a bell-shaped medusa stage. In ''Hydrichthys'', the polyp has no tentacles but develops a root-like stolon which it thrusts through the skin of its host, usually a fish, to suck the blood and body fluids. During the medusa stage, ''Hydrichthys'' lives independently in the ocean. In one species, ''Hydrichthys sarcotretis'', parasitism is taken a stage further when the hydrozoan attaches itself to the copepod ''Cardiodectes medusaeus''. This is itself an ectoparasite of lanternfish in the family Myctophidae. The copepod attaches itself to the bulbus arteriosus o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hydrichthys Pacificus
''Hydrichthys'' is a genus of colonial marine hydrozoans formerly placed in the family Hydrichthyidae but is now included in the family Pandeidae. The polyps of members of this genus are parasitic. The polyp attaches itself to a fish, and in one species exhibits hyperparasitism by attaching itself to a copepod, itself the parasite of a fish. Parasitism The life history of hydrozoans typically has a larval, polyp stage and a bell-shaped medusa stage. In ''Hydrichthys'', the polyp has no tentacles but develops a root-like stolon which it thrusts through the skin of its host, usually a fish, to suck the blood and body fluids. During the medusa stage, ''Hydrichthys'' lives independently in the ocean. In one species, ''Hydrichthys sarcotretis'', parasitism is taken a stage further when the hydrozoan attaches itself to the copepod ''Cardiodectes medusaeus''. This is itself an ectoparasite of lanternfish in the family Myctophidae. The copepod attaches itself to the bulbus arteriosus o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hydrichthys Mirus
''Hydrichthys'' is a genus of colonial marine hydrozoans formerly placed in the family Hydrichthyidae but is now included in the family Pandeidae. The polyps of members of this genus are parasitic. The polyp attaches itself to a fish, and in one species exhibits hyperparasitism by attaching itself to a copepod, itself the parasite of a fish. Parasitism The life history of hydrozoans typically has a larval, polyp stage and a bell-shaped medusa stage. In ''Hydrichthys'', the polyp has no tentacles but develops a root-like stolon which it thrusts through the skin of its host, usually a fish, to suck the blood and body fluids. During the medusa stage, ''Hydrichthys'' lives independently in the ocean. In one species, ''Hydrichthys sarcotretis'', parasitism is taken a stage further when the hydrozoan attaches itself to the copepod ''Cardiodectes medusaeus''. This is itself an ectoparasite of lanternfish in the family Myctophidae. The copepod attaches itself to the bulbus arteriosus o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hydrichthys Cyclothonis
''Hydrichthys'' is a genus of colonial marine hydrozoans formerly placed in the family Hydrichthyidae but is now included in the family Pandeidae. The polyps of members of this genus are parasitic. The polyp attaches itself to a fish, and in one species exhibits hyperparasitism by attaching itself to a copepod, itself the parasite of a fish. Parasitism The life history of hydrozoans typically has a larval, polyp stage and a bell-shaped medusa stage. In ''Hydrichthys'', the polyp has no tentacles but develops a root-like stolon which it thrusts through the skin of its host, usually a fish, to suck the blood and body fluids. During the medusa stage, ''Hydrichthys'' lives independently in the ocean. In one species, ''Hydrichthys sarcotretis'', parasitism is taken a stage further when the hydrozoan attaches itself to the copepod ''Cardiodectes medusaeus''. This is itself an ectoparasite of lanternfish in the family Myctophidae. The copepod attaches itself to the bulbus arteriosus o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hydrichthys Boycei
''Hydrichthys'' is a genus of colonial marine hydrozoans formerly placed in the family Hydrichthyidae but is now included in the family Pandeidae. The polyps of members of this genus are parasitic. The polyp attaches itself to a fish, and in one species exhibits hyperparasitism by attaching itself to a copepod, itself the parasite of a fish. Parasitism The life history of hydrozoans typically has a larval, polyp stage and a bell-shaped medusa stage. In ''Hydrichthys'', the polyp has no tentacles but develops a root-like stolon which it thrusts through the skin of its host, usually a fish, to suck the blood and body fluids. During the medusa stage, ''Hydrichthys'' lives independently in the ocean. In one species, ''Hydrichthys sarcotretis'', parasitism is taken a stage further when the hydrozoan attaches itself to the copepod ''Cardiodectes medusaeus''. This is itself an ectoparasite of lanternfish in the family Myctophidae. The copepod attaches itself to the bulbus arteriosus o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bulbus Arteriosus
In the circulatory system of fish, the bulbus arteriosus is a pear shaped chamber that functions as a capacitor, maintaining continuous blood flow into the gill arch Branchial arches, or gill arches, are a series of bony "loops" present in fish, which support the gills. As gills are the primitive condition of vertebrates, all vertebrate embryos develop pharyngeal arches, though the eventual fate of these arc ...es. References 1. "ZFIN: Anatomical Structure: Bulbus Arteriosus." ZFIN: The Zebrafish Model Organism Database. Web. 8 May 2011. . Fish anatomy {{fish-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cardiodectes Medusaeus
''Cardiodectes bellottii'' is a species of copepods in the family Pennellidae. It is a parasite of fish. It is found in the Atlantic and Pacific Oceans as well as the Mediterranean Sea; specimens from the Pacific were formerly treated as a separate species, ''Cardiodectes medusaeus''. In the cnidarian '' Hydrichthys sarcotretis'', parasitism is taken a stage further when the hydrozoan attaches itself to the ''C. bellottii''. This is itself an ectoparasite of the northern lampfish (''Stenobrachius leucopsarus'') in the family Myctophidae. The copepod attaches itself to the bulbus arteriosus of the fish. Such a parasitic chain is known as hyperparasitism. ''C. bellottii'' requires two hosts for proper development. It will go through five successive postembryonic stages, then only the postmated females will go into the pericardial cavity of a lanternfish Lanternfishes (or myctophids, from the Greek μυκτήρ ''myktḗr'', "nose" and ''ophis'', "serpent") are small mesopelagi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Genus
Genus ( plural genera ) is a taxonomic rank used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In the hierarchy of biological classification, genus comes above species and below family (taxonomy), family. In binomial nomenclature, the genus name forms the first part of the binomial species name for each species within the genus. :E.g. ''Panthera leo'' (lion) and ''Panthera onca'' (jaguar) are two species within the genus ''Panthera''. ''Panthera'' is a genus within the family Felidae. The composition of a genus is determined by taxonomy (biology), taxonomists. The standards for genus classification are not strictly codified, so different authorities often produce different classifications for genera. There are some general practices used, however, including the idea that a newly defined genus should fulfill these three criteria to be descriptively useful: # monophyly – all descendants ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Medusa (biology)
Jellyfish and sea jellies are the informal common names given to the medusa-phase of certain gelatinous members of the subphylum Medusozoa, a major part of the phylum Cnidaria. Jellyfish are mainly free-swimming marine animals with umbrella-shaped bells and trailing tentacles, although a few are anchored to the seabed by stalks rather than being mobile. The bell can pulsate to provide propulsion for highly efficient locomotion. The tentacles are armed with stinging cells and may be used to capture prey and defend against predators. Jellyfish have a complex life cycle; the medusa is normally the sexual phase, which produces planula larvae that disperse widely and enter a sedentary polyp phase before reaching sexual maturity. Jellyfish are found all over the world, from surface waters to the deep sea. Scyphozoans (the "true jellyfish") are exclusively marine, but some hydrozoans with a similar appearance live in freshwater. Large, often colorful, jellyfish are common in coa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
