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Pennella Tridentata
''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 crustacean larvae, 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 ... [...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] |
