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Dendroctonus Adjunctus
''Dendroctonus adjunctus'', the roundheaded pine beetle, is a species of bark beetle in the Family (biology), family Curculionidae found in North America. A parasite, the roundheaded pine beetle feeds on and eventually kills pine trees of several species in Guatemala, Mexico, and the Southern United States (New Mexico, Arizona, Nevada, Colorado, Utah). Roundheaded pine beetles are a serious threat to wild and commercial pine stocks, wiping out up to half of pine trees in a region in outbreak years. To prevent and mitigate the beetle's epidemic outbreaks, loggers have developed a variety of biological, cultural, and chemical controls. Description Like many insect species, the roundheaded pine beetle goes through several stages in its life cycle, changing dramatically in appearance between each one. Adults are 5-6 mm long and 3 mm wide, with females slightly larger than males. Adult exoskeletons are shiny, reflective, dark brown or black, and covered with hairs. Their eyes are flat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Species
In biology, a species is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of the appropriate sexes or mating types can produce fertile offspring, typically by sexual reproduction. Other ways of defining species include their karyotype, DNA sequence, morphology, behaviour or ecological niche. In addition, paleontologists use the concept of the chronospecies since fossil reproduction cannot be examined. The most recent rigorous estimate for the total number of species of eukaryotes is between 8 and 8.7 million. However, only about 14% of these had been described by 2011. All species (except viruses) are given a two-part name, a "binomial". The first part of a binomial is the genus to which the species belongs. The second part is called the specific name or the specific epithet (in botanical nomenclature, also sometimes i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
