Class (biology)

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The hierarchy of biological classification's major eight taxonomic ranks. Intermediate minor rankings are not shown.

A class is the taxonomic rank in the biological classification of organisms in biology below phylum and above order. The orders of taxonomy are life, domain, kingdom, phylum, class, order, family, genus, and species.

For example, Mammalia is the class used in the classification of dogs, whose phylum is Chordata (animals with notochords) and order is Carnivora (mammals that eat meat).

History of the concept

The class as a distinct rank of biological classification having its own distinctive name (and not just called a top-level genus (genus summum)) was first introduced by a French botanist Joseph Pitton de Tournefort in his classification of plants (appeared in his 1694 Eléments de botanique). Carolus Linnaeus was the first to apply it consistently to the division of all three kingdoms of Nature (minerals, plants, and animals) in his Systema Naturae (1735, 1st. Ed.). Since then class had been considered the highest level of the taxonomic hierarchy until the embranchements, now called phyla, and divisions were introduced in the nineteenth century.

v • d • e Taxonomic ranks
				Magnorder
Domain/Superkingdom	Superphylum/Superdivision	Superclass		Superorder	Superfamily			Superspecies
Kingdom	Phylum/Division	Class	Legion	Order	Family	Tribe	Genus	Species
Subkingdom	Subphylum	Subclass	Cohort	Suborder	Subfamily	Subtribe	Subgenus	Subspecies
Infrakingdom/Branch	Infraphylum	Infraclass		Infraorder		Alliance		Infraspecies
	Microphylum	Parvclass		Parvorder

Categories: Scientific classification | Botanical nomenclature

Index Of Related Pages

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Class (biology)	Class (computer science)	Class (computing)
Class (disambiguation)	Class (education)	Class (emission)
Class (file format)	Class (film)	Class (locomotive)
Class (mathematics)	Class (movie)	Class (object-oriented programming)
Class (parliamentary procedure)	Class (philosophy)	Class (programming)
Class (set theory)	Class (ship)	Class (social)
Class (software)	Class (taxonomy)	Class (warez)
Class 01	Class 02	Class 03
Class 04	Class 05	Class 06
Class 07	Class 08	Class 09
Class 1	Class 1-A	Class 10
Class 100 superhuman strength	Class 101	Class 103
Class 108	Class 11	Class 110
Class 113	Class 12	Class 120
Class 121	Class 13	Class 14
Class 15	Class 150	Class 153
Class 156	Class 158	Class 16
Class 165	Class 166	Class 168
Class 17	Class 170	Class 171
Class 172	Class 175	Class 18
Class 180	Class 180 Adelante	Class 19
Class 1 Senator	Class 1 railroad	Class 1 senator
Class 1 truck	Class 2	Class 20
Class 205	Class 207	Class 220
Class 221	Class 23	Class 24
Class 25	Class 26	Class 27
Class 2B	Class 2 Senator	Class 2 railroad
Class 3	Class 30	Class 31
Class 312	Class 317	Class 319
Class 322	Class 323	Class 33
Class 34	Class 341	Class 35
Class 36	Class 37	Class 376
Class 377	Class 378	Class 38
Class 39	Class 390	Class 395
Class 3 Senator	Class 40	Class 41
Class 42	Class 43	Class 44
Class 442	Class 45	Class 46
Class 460	Class 47	Class 471 Czech railway motor car
Class 488	Class 4 national insurance	Class 4 switch
Class 4 telephone switch	Class 5	Class 50
Class 507	Class 508	Class 52
Class 52 (disambiguation)	Class 52 western	Class 53
Class 54	Class 55	Class 56
Class 57	Class 58	Class 59
Class 5MT	Class 5MT "Crab" 2-6-0	Class 5 telephone switch
Class 5 telephone switches	Class 60	Class 61
Class 62	Class 64	Class 65
Class 66	Class 67	Class 69
Class 70	Class 71	Class 72
Class 73	Class 74	Class 75
Class 754	Class 754 (ex T 478.4) Czech and Slovak diesel locomotive	Class 754 locomotive
Class 76	Class 77	Class 78
Class 79	Class 8	Class 80
Class 81	Class 812	Class 82
Class 83	Class 84	Class 85
Class 86	Class 87	Class 88
Class 89	Class 9	Class 90
Class 91	Class 92	Class 93
Class 94	Class 95	Class 95FM
Class 96	Class 960	Class 97
Class 98	Class 99	Class 9F
Class A	Class A-1	Class A1
Class A1 (baseball)	Class A4	Class AA
Class AAA	Class AB	Class AB amplifier
Class AB amplifiers	Class A (disambiguation)	Class A Airports
Class A Commercial Driver's license	Class A Office Space	Class A War Criminal
Class A airfield	Class A airport	Class A airspace
Class A amplifier	Class A dealer	Class A drug
Class A drugs	Class A foam	Class A metal
Class A network	Class A office space	Class A surfaces
Class A television	Class A television service	Class A television station
Class A truck	Class A uniform	Class A war criminal
Class A war criminals	Class Act	Class Act (Happy Tree Friends)
Class Act (Irish TV series)	Class Act (TV series)	Class Act Records
Class Action	Class Action (1991 film)	Class Action (1991 movie)
Class Action (2005 film)	Class Action Fairness Act	Class Action Fairness Act of 2005
Class Auk	Class B	Class B (disambiguation)
Class B Airports	Class B airport	Class B airports
Class B airspace	Class B amplifier	Class B dealer
Class B drug	Class B drugs	Class B fireworks
Class B foam	Class B metal	Class B network
Class B truck	Class Based Queueing	Class C
Class CNBC	Class C (disambiguation)	Class C Airports
Class C GPCR	Class C airport	Class C airports
Class C airspace	Class C amplifier	Class C fireworks
Class C network	Class Clown	Class Clowns
Class Comics	Class Consciousness	Class D
Class D (disambiguation)	Class D Fire Extinguisher	Class D airspace
Class D amplifier	Class D fire extinguisher	Class Diagram
Class Dismissed	Class Dismissed (TV series)	Class E
Class E31	Class E851	Class E (disambiguation)
Class E airspace	Class E amplifier	Class E network
Class Editori	Class F	Class F (disambiguation)
Class F airspace	Class Four Highway	Class G
Class G (disambiguation)	Class G airspace	Class Guitar
Class H	Class H planet	Class Hierarchies
Class I	Class IB anti-arrhythmic	Class II
Class II-associated invariant chain peptide	Class III	Class III (disambiguation)
Class III NFA firearm	Class III PI 3-kinase	Class III Senator
Class III antiarrhythmic	Class III appliance	Class III b-tubulin
Class III railroad	Class III ß-tubulin	Class II (disambiguation)
Class II MHC	Class II MHC molecule	Class II MHC molecules
Class II PI 3-kinase	Class II PI 3-kinases	Class II Senator
Class II appliance	Class II bacteriocin	Class II bacteriocins
Class II cabinet	Class II gene	Class II histocompatibility molecule
Class II railroad	Class II star	Class IV UAV
Class I MHC	Class I PI 3-kinase	Class I PI 3-kinases
Class I Railroad	Class I Senator	Class I UAV
Class I antiarrhythmic agent	Class I histocompatibility molecule	Class I rail carrier
Class I railroad	Class I railroads	Class I railway
Class I recall	Class I senators	Class J
Class J (disambiguation)	Class J disambiguation	Class K
Class L	Class Library for Numbers	Class M
Class M (disambiguation)	Class M planet	Class M star
Class N	Class NC	Class NP

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History of the concept

See also

Index Of Related Pages