A genus (,  genera) is a taxonomic rank used in the biological classification of living and fossil organisms 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. 

The composition of a genus is determined by a taxonomist. 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: 

Moreover, genera should be composed of phylogenetic units of the same kind as other (analogous) genera. 

The term comes from the Latin ' ("origin; type; group; race"), a noun form cognate with ' ("to bear; to give birth to"). Linnaeus popularized its use in his 1753 "Species Plantarum", but the French botanist Joseph Pitton de Tournefort (1656–1708) is considered "the founder of the modern concept of genera". 

The scientific name of a genus may be called the generic name or generic epithet: it is always capitalized. It plays a pivotal role in binomial nomenclature, the system of naming organisms.
What should genera be composed of?
Are they of the same kind as something else?
What type of rank is a genus?
Is it used for mineral classification?
What type of classification then?
Is that biological?
Is genus above or below species in the hierarchy?
What's it position relative to family?
Who determines its composition?
Is it known whether aliens would fit within these classifications?
Are the standards for classification strictly codified?
How many criteria should a newly defined genus fulfill to be useful?
What language does the term Genus come from?
What's one of the things it means in that language?
Who popularized its use?
When?
phylogenetic units
Moreover, genera should be composed of phylogenetic units 
yes
Moreover, genera should be composed of phylogenetic units of the same kind as other (analogous) genera. 
A taxonomic rank
A genus (,  genera) is a taxonomic rank
No
A genus (,  genera) is a taxonomic rank used in the biological classification of living and fossil organisms
Living and fossil organisms
is a taxonomic rank used in the biological classification of living and fossil organisms
Yes
A genus (,  genera) is a taxonomic rank used in the biological classification
Above
 of biological classification, genus comes above species
Below
f biological classification, genus comes above species and below family.
A taxonomist.
The composition of a genus is determined by a taxonomist. 
No
The composition of a genus is determined by a taxonomist. 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: 
No
The standards for genus classification are not strictly codified, 
Three
The composition of a genus is determined by a taxonomist. 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: 
Latin
The term comes from the Latin ' ("origin; type; group; race"), 
Origin
The term comes from the Latin ' ("origin; type; group; race"), 
Linnaeus book.
Linnaeus popularized its use in his 1753 "Species Plantarum"
1753
Linnaeus popularized its use in his 1753 "Species Plantarum", 