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Genus is a taxonomic rank used in the biological classification of living and fossil organisms as well as viruses, in biology. In the hierarchy of biological classification, genus comes above species and below family. In binomial nomenclature, the genus name forms the first part of the binomial species name for each species within the genus.
Extinction is the termination of a kind of organism or of a group of kinds (taxon), usually a species. The moment of extinction is generally considered to be the death of the last individual of the species, although the capacity to breed and recover may have been lost before this point. Because a species' potential range may be very large, determining this moment is difficult, and is usually done retrospectively. This difficulty leads to phenomena such as Lazarus taxa, where a species presumed extinct abruptly "reappears" after a period of apparent absence.
The International Union for Conservation of Nature (IUCN) Red List of Threatened Species, founded in 1964, is the world's most comprehensive inventory of the global conservation status of biological species. It uses a set of criteria to evaluate the extinction risk of thousands of species and subspecies. These criteria are relevant to all species and all regions of the world. With its strong scientific base, the IUCN Red List is recognized as the most authoritative guide to the status of biological diversity. A series of Regional Red Lists are produced by countries or organizations, which assess the risk of extinction to species within a political management unit.
The conservation status of a group of organisms indicates whether the group still exists and how likely the group is to become extinct in the near future. Many factors are taken into account when assessing conservation status: not simply the number of individuals remaining, but the overall increase or decrease in the population over time, breeding success rates, and known threats. Various systems of conservation status exist and are in use at international, multi-country, national and local levels as well as for consumer use.
Packera is a genus of about 64 species of plants in the composite family, Asteraceae. Its members were previously included in the genus Senecio, but were divided out based on chromosome numbers, a variety of morphological characters, and molecular phylogeny.
The Dacinae are a subfamily of the fruit fly family Tephritidae. Its 41 genera are distributed among three tribes:
Pteroctopus is a genus of octopuses in the family Octopodidae.
An endangered species is a species that is very likely to become extinct in the near future, either worldwide or in a particular political jurisdiction. Endangered species may be at risk due to factors such as habitat loss, poaching and invasive species. The International Union for Conservation of Nature (IUCN) Red List lists the global conservation status of many species, and various other agencies assess the status of species within particular areas. Many nations have laws that protect conservation-reliant species which, for example, forbid hunting, restrict land development, or create protected areas. Some endangered species are the target of extensive conservation efforts such as captive breeding and habitat restoration.
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.
Paraceratitella is a genus of tephritid or fruit flies in the family Tephritidae.
Paraceratitella compta is a species of tephritid or fruit flies in the genus Paraceratitella of the family Tephritidae.
Paraceratitella connexa is a species of tephritid or fruit flies in the genus Paraceratitella of the family Tephritidae.
Paraceratitella oblonga is a species of tephritid or fruit flies in the genus Paraceratitella of the family Tephritidae.
The sugar beet root maggot is a species of picture-winged fly in the genus Tetanops of the family Ulidiidae. It is a serious pest of sugarbeets in North America.
Packera eurycephala is a species of flowering plant in the aster family known by the common name widehead groundsel. It is native to a section of the western United States encompassing southern Oregon, northern California, and northern Nevada. It can be found in dry habitat types, often in disturbed areas, and it favors serpentine soils.
Megachile eurycephala is a species of bee in the family Megachilidae. It was described by Yan-Ru Wu in 2005.
Habropoda is a genus of anthophorine bees in the family Apidae. There are at least 50 described species in Habropoda.
Mezira is a genus of flat bugs in the family Aradidae. There are more than 70 described species in Mezira.
Enchenopa is a genus of treehoppers in the family Membracidae. There are more than 50 described species in Enchenopa.
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