Library of Congress >> MARC >> Bibliographic >> 70X-75X >> 754

754 - Added Entry-Taxonomic Identification (R)

MARC 21 Bibliographic - Full
October 2007

First Indicator
# - Undefined

Second Indicator
# - Undefined

Subfield Codes
$a - Taxonomic name (R)
$c - Taxonomic category (R)
$d - Common or alternative name (R)
$x - Non-public note (R)
$z - Public note (R)
$0 - Authority record control number (R)
$2 - Source of taxonomic identification (NR)
$6 - Linkage (NR)
$8 - Field link and sequence number (R)


Added entry in which the entry element is the taxonomic name or category associated with the described item.

Subfields $a and $2 are always used.




$a - Taxonomic name
Taxonomic names conform to the syntax controls of the taxonomic classification system identified in subfield $2. Subfield $a is repeatable for each taxonomic name associated with the item. Subfield $a is preceded by subfield $c, which indicates the taxonomic hierarchical category to which the name belongs. Each combination is input in repeatable $c and $a subfields in taxonomic hierarchical order.
754 ##$ckingdom$aPlantae$cphylum$aSpermatophyta$cclass$aAngiospermae$csubclass$aDicotyledoneae$corder$aRosales$cfamily$aRosaceae$cgenus$aRosa$cspecies$asetigera$cvariety$atomentosa.$2[code for Lyman David Benson's Plant Classification]
$c - Taxonomic category
Taxonomic category to which the name in subfield $a belongs. The terms used in this subfield are specified by the thesaurus identified in subfield $2. Subfield $c always precedes the data with which it is associated.
754 ##$cfamily$aGekkonidae$cgenus$aHemidactylus$cspecies$aTurcicus.$2[source of taxonomic identification]
$d - Common or alternative name
Common or alternative name to which the name in subfield $a belongs. Subfield $d may refer to one or multiple occurrences of subfield $a.
754 ##$cfamily$aGekkonidae$cgenus$aHemidactylus$cspecies$aTurcicus$dMediterranean gecko$dMediterranean gekko.$2[source of taxonomic identification]
754 ##$cfamily$aViperidae$cgenus$aSistrurus$cspecies$amiliarius$dDusky pigmy rattlesnake$dGround rattler$dPigmy rattler$dPigmy rattlesnake$dRattler$dRattlesnake.$2[source of taxonomic identification]
754 ##$cfamily$aViperidae$cgenus$aCrotalus$aspecies$aadamanteus$dDiamondback$dDiamondback rattlesnake$dEastern diamondback$dEastern diamondback rattlesnake$dRattler$dRattlesnake.$2[source of taxonomic identification]
$x - Non-public note
Note that is not displayed to the public.
754 ##$cfamily$aGekkonidae$cgenus$aHemidactylus$cspecies$aTurcicus$dMediterranean gecko$dMediterranean gekko$xHemidactylus turcicus.$2[source of taxonomic identification]
$z - Public note
Note relating to the taxonomic identification written in a form that is adequate or intended for public display.
754 ##$cfamily$aPottiaceae$cgenus$aBarbula$cspecies$aagraria$xBarbula agraria.$zSpecies authority: Hedw.turcicus.$2[source of taxonomic identification]
754 ##$cfamily$aPoaceae$cgenus$aAndropogon$cspecies$aglomeratus$cvariety$apumilus$dBushy Broom Grass$xAndropogon glomeratus$zSpecies authority: (Walt.) BSP$zVariety authority: Vasey turcicus.$2[source of taxonomic identification]
$0 - Authority record control number
See description of this subfield in Appendix A: Control Subfields.
$2 - Source of taxonomic identification
Name or a MARC code that identifies the source list from which the taxonomic identification was assigned. Code from: Taxonomic Classification Source Codes.
$6 - Linkage
See description of this subfield in Appendix A: Control Subfields.
$8 - Field link and sequence number
See description of this subfield in Appendix A: Control Subfields.


Punctuation - Subfield that precedes subfield $2 in field 754 ends with a period unless the last word in the subfield is an abbreviation, initial/letter, or other data that ends with a mark of punctuation. No punctuation is used between repeated subfield $a.


$a - Taxonomic name/taxonomic hierarchical category [REDEFINED, 2001]
Prior to 2001, subfield $a contained both the taxonomic name and the taxonomic hierarchical category to which the name belonged.
$c - Taxonomic category [NEW, 2001]
$d - Common or alternative name [NEW, 2001]
$x - Non-public note [NEW, 2001]
$z - Public note [NEW, 2001]
$0 - Authority record control number [NEW, 2007]

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