References for Genus 

One or more genera grouped together, distinguishes differences within an order. May be divided into subfamilies.

Family Classification 

A species is the most specific and basic taxonomic unit used in the classification of living organisms. Originally established as the narrowest level in Linnaean taxonomy, a species generally refers to a group of individuals capable of reproducing to yield offspring, and it constitutes the second part of an organism's scientific name.

Species in Biology

A groups of species that share similarities based on common ancestry. The first part of the name used to classify an organism in the classification system made by Carolus Linnaeus

Arizona State University

Georgetown University

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From largest/most general to smallest/most specific:

- domain
- kingdom 
- phylum (in zoology) / division (in botany)	
- class 
- order
- family
- genus
- species

Main Taxonomic Ranks in Biology

Breedlove, S. & Watson, N. (2017). Behavioral neuroscience, eighth edition. Oxford University Press.

Behavioral Neuroscience 8th Edition

https://openstax.org/details/books/microbiology/

Microbiology covers the scope and sequence requirements for a single-semester microbiology course for non-majors. The book presents the core concepts of microbiology with a focus on applications for careers in allied health. The pedagogical features of the text make the material interesting and accessible while maintaining the career-application focus and scientific rigor inherent in the subject matter. Microbiology’s art program enhances students’ understanding of concepts through clear and effective illustrations, diagrams, and photographs.

Microbiology is produced through a collaborative publishing agreement between OpenStax and the American Society for Microbiology Press. The book aligns with the curriculum guidelines of the American Society for Microbiology.

OpenStax Microbiology Textbook

One or more families grouped together, distinugishes differences within a class.

Superorders and suborders are sometimes added between order and class or family, respectively.

Order (biology)

One or more orders grouped together, distinguishes differences within a phylum/division.

Class (biology)

One or more phyla/divisions grouped together, distinguishes differences within a domain .

Kingdom (biology)

One or more classes grouped together, distinguishes differences within a kingdom.

Called phylum/phyla in zoology and division(s) in botany.

Phylum/Division (biology)

Genus 

In biological taxonomy, a domain is the highest taxonomic rank widely accepted for the classification of organisms.

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