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Pennella Elongata
''Pennella'' is a genus of large copepods which are common parasites of large pelagic fishes. They begin their life cycle as a series of free-swimming planktonic larvae. The females metamorphose into a parasitic stage when they attach to a host and enter into its skin. The males are free swimming. Due to their large size and mesoparasitic life history there have been a number of studies of ''Pennella'', the members of which are among the largest of the parasitic Copepoda. All species are found as adults buried into the flesh of marine bony fish, except for a single species, ''Pennella balaenopterae'' which can be found in the muscles and blubber of cetaceans and occasionally other marine mammals, and is the largest species of copepod. Biology Like most parasitic copepods it is the female which is parasitic in ''Pennella'' while the males are free swimming. The female has a two host life cycle and egg production commences when an inseminated female settles on its ultimate host, usu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lorenz Oken
Lorenz Oken (1 August 1779 – 11 August 1851) was a German naturalist, botanist, biologist, and ornithologist. Oken was born Lorenz Okenfuss (german: Okenfuß) in Bohlsbach (now part of Offenburg), Ortenau, Baden, and studied natural history and medicine at the universities of Freiburg and Würzburg. He went on to the University of Göttingen, where he became a ''Privatdozent'' (unsalaried lecturer), and shortened his name to Oken. As Lorenz Oken, he published a small work entitled ''Grundriss der Naturphilosophie, der Theorie der Sinne, mit der darauf gegründeten Classification der Thiere'' (1802). This was the first of a series of works which established him as a leader of the movement of " Naturphilosophie" in Germany. In it he extended to physical science the philosophical principles which Immanuel Kant (1724–1804) had applied to epistemology and morality. Oken had been preceded in this by Johann Gottlieb Fichte (1762–1814), who, acknowledging that Kant had discovered ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cephalopod
A cephalopod is any member of the molluscan class Cephalopoda (Greek plural , ; "head-feet") such as a squid, octopus, cuttlefish, or nautilus. These exclusively marine animals are characterized by bilateral body symmetry, a prominent head, and a set of arms or tentacles (muscular hydrostats) modified from the primitive molluscan foot. Fishers sometimes call cephalopods "inkfish", referring to their common ability to squirt ink. The study of cephalopods is a branch of malacology known as teuthology. Cephalopods became dominant during the Ordovician period, represented by primitive nautiloids. The class now contains two, only distantly related, extant subclasses: Coleoidea, which includes octopuses, squid, and cuttlefish; and Nautiloidea, represented by ''Nautilus'' and ''Allonautilus''. In the Coleoidea, the molluscan shell has been internalized or is absent, whereas in the Nautiloidea, the external shell remains. About 800 living species of cephalopods have been ident ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pennella Makaira
''Pennella'' is a genus of large copepods which are common parasites of large pelagic fishes. They begin their life cycle as a series of free-swimming planktonic larvae. The females metamorphose into a parasitic stage when they attach to a host and enter into its skin. The males are free swimming. Due to their large size and mesoparasitic life history there have been a number of studies of ''Pennella'', the members of which are among the largest of the parasitic Copepoda. All species are found as adults buried into the flesh of marine bony fish, except for a single species, ''Pennella balaenopterae'' which can be found in the muscles and blubber of cetaceans and occasionally other marine mammals, and is the largest species of copepod. Biology Like most parasitic copepods it is the female which is parasitic in ''Pennella'' while the males are free swimming. The female has a two host life cycle and egg production commences when an inseminated female settles on its ultimate host, usu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pennella Instructa
''Pennella'' is a genus of large copepods which are common parasites of large pelagic fishes. They begin their life cycle as a series of free-swimming planktonic larvae. The females metamorphose into a parasitic stage when they attach to a host and enter into its skin. The males are free swimming. Due to their large size and mesoparasitic life history there have been a number of studies of ''Pennella'', the members of which are among the largest of the parasitic Copepoda. All species are found as adults buried into the flesh of marine bony fish, except for a single species, ''Pennella balaenopterae'' which can be found in the muscles and blubber of cetaceans and occasionally other marine mammals, and is the largest species of copepod. Biology Like most parasitic copepods it is the female which is parasitic in ''Pennella'' while the males are free swimming. The female has a two host life cycle and egg production commences when an inseminated female settles on its ultimate host, usu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pennella Hawaiiensis
''Pennella'' is a genus of large copepods which are common parasites of large pelagic fishes. They begin their life cycle as a series of free-swimming planktonic larvae. The females metamorphose into a parasitic stage when they attach to a host and enter into its skin. The males are free swimming. Due to their large size and mesoparasitic life history there have been a number of studies of ''Pennella'', the members of which are among the largest of the parasitic Copepoda. All species are found as adults buried into the flesh of marine bony fish, except for a single species, ''Pennella balaenopterae'' which can be found in the muscles and blubber of cetaceans and occasionally other marine mammals, and is the largest species of copepod. Biology Like most parasitic copepods it is the female which is parasitic in ''Pennella'' while the males are free swimming. The female has a two host life cycle and egg production commences when an inseminated female settles on its ultimate host, usu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pennella Filosa
''Pennella'' is a genus of large copepods which are common parasites of large pelagic fishes. They begin their life cycle as a series of free-swimming planktonic larvae. The females metamorphose into a parasitic stage when they attach to a host and enter into its skin. The males are free swimming. Due to their large size and mesoparasitic life history there have been a number of studies of ''Pennella'', the members of which are among the largest of the parasitic Copepoda. All species are found as adults buried into the flesh of marine bony fish, except for a single species, ''Pennella balaenopterae'' which can be found in the muscles and blubber of cetaceans and occasionally other marine mammals, and is the largest species of copepod. Biology Like most parasitic copepods it is the female which is parasitic in ''Pennella'' while the males are free swimming. The female has a two host life cycle and egg production commences when an inseminated female settles on its ultimate host, usu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pennella Exocoeti
''Pennella exocoeti'' is a large ectoparasitic copepod, a specialist parasite of flying fish. The adult female copepod clings to the fish's gills or skin and feeds on its body fluids. Taxonomy ''Pennella exocoeti'' was first described by the Danish zoologist Hans Severin Holten in 1802 from a specimen probably found on the mirrorwing flyingfish (''Hirundichthys speculiger''). He called it a "gill worm" and recognised that it had close affinities with '' Chondracanthus merluccii'', another "gill worm" found on a member of the cod family Gadidae, but he did not realise they were both copepods. Another species was described by the French naturalist Charles Alexandre Lesueur as ''Pennella blainvilli'' from the tropical two-wing flyingfish (''Exocoetus volitans''), but that has since been determined to be a synonym of ''P. exocoeti''. Description This is a large copepod that may grow to a length of . The mature female found attached to its host bears little resemblance to a free-liv ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pennella Elongata
''Pennella'' is a genus of large copepods which are common parasites of large pelagic fishes. They begin their life cycle as a series of free-swimming planktonic larvae. The females metamorphose into a parasitic stage when they attach to a host and enter into its skin. The males are free swimming. Due to their large size and mesoparasitic life history there have been a number of studies of ''Pennella'', the members of which are among the largest of the parasitic Copepoda. All species are found as adults buried into the flesh of marine bony fish, except for a single species, ''Pennella balaenopterae'' which can be found in the muscles and blubber of cetaceans and occasionally other marine mammals, and is the largest species of copepod. Biology Like most parasitic copepods it is the female which is parasitic in ''Pennella'' while the males are free swimming. The female has a two host life cycle and egg production commences when an inseminated female settles on its ultimate host, usu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pennella Elegans
''Pennella'' is a genus of large copepods which are common parasites of large pelagic fishes. They begin their life cycle as a series of free-swimming planktonic larvae. The females metamorphose into a parasitic stage when they attach to a host and enter into its skin. The males are free swimming. Due to their large size and mesoparasitic life history there have been a number of studies of ''Pennella'', the members of which are among the largest of the parasitic Copepoda. All species are found as adults buried into the flesh of marine bony fish, except for a single species, ''Pennella balaenopterae'' which can be found in the muscles and blubber of cetaceans and occasionally other marine mammals, and is the largest species of copepod. Biology Like most parasitic copepods it is the female which is parasitic in ''Pennella'' while the males are free swimming. The female has a two host life cycle and egg production commences when an inseminated female settles on its ultimate host, usu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pennella Diodontis
''Pennella'' is a genus of large copepods which are common parasites of large pelagic fishes. They begin their life cycle as a series of free-swimming planktonic larvae. The females metamorphose into a parasitic stage when they attach to a host and enter into its skin. The males are free swimming. Due to their large size and mesoparasitic life history there have been a number of studies of ''Pennella'', the members of which are among the largest of the parasitic Copepoda. All species are found as adults buried into the flesh of marine bony fish, except for a single species, ''Pennella balaenopterae'' which can be found in the muscles and blubber of cetaceans and occasionally other marine mammals, and is the largest species of copepod. Biology Like most parasitic copepods it is the female which is parasitic in ''Pennella'' while the males are free swimming. The female has a two host life cycle and egg production commences when an inseminated female settles on its ultimate host, usu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pennella Cylindrica
''Pennella'' is a genus of large copepods which are common parasites of large pelagic fishes. They begin their life cycle as a series of free-swimming planktonic larvae. The females metamorphose into a parasitic stage when they attach to a host and enter into its skin. The males are free swimming. Due to their large size and mesoparasitic life history there have been a number of studies of ''Pennella'', the members of which are among the largest of the parasitic Copepoda. All species are found as adults buried into the flesh of marine bony fish, except for a single species, ''Pennella balaenopterae'' which can be found in the muscles and blubber of cetaceans and occasionally other marine mammals, and is the largest species of copepod. Biology Like most parasitic copepods it is the female which is parasitic in ''Pennella'' while the males are free swimming. The female has a two host life cycle and egg production commences when an inseminated female settles on its ultimate host, usu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pennella Balaenopterae
''Pennella balaenopterae'' is a large ectoparasitic copepod specialising in parasitising marine mammals. It is the largest member of the genus ''Pennella'', the other species of which are parasites of larger marine fish. Description ''P. balaenopterae'' is one of the largest species of copepods within the family Pennellidae, reaching up to in length. The adult females are characterised by a loss of external segmentation and absorption of swimming legs. ''Pennella'' species are recognised by the branched outgrowths on the posterior part of their abdomens. The mandibles form a sucking tube for the mouth through which the species feed and adults also have a pair of segmented sensory antennae. Five pairs of thoracic legs are found in the species, which are more modified in females than males. After attaching to the host the parasite undergoes diphasic growth. The first phase of this type of growth occurs in the copepod's anterior body portion. During the second phase of growth, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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